maha powerex mh-c9000 battery charger
DESCRIPTION
Maha PowerEx MH-C9000 Battery Charger for NiMH (Ni-MH) rechargeable batteries/accumulators (eneloop, eneloops)TRANSCRIPT
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$69.95
MH-C9000-0000GS
MH-C9000
Product DescriptionThe MH-C9000 WizardOne Charger-Analyzer for 4 AA / AAA NiMH / NiCD Batteries from Powerex charges 1-4 AA or AAA
NiMH or NiCD batteries via 4 independent slots. It supports batteries with capacities of 100-20,000mAh. The large, backlit LCD
screen displays capacity, voltage, elapsed time and current. The charger provides 29 selectable charge and discharge rates,
including 19 charging currents from 0.2-2.0A (200-2000mA) and 10 discharging currents from 0.1-1.0A (100-1000mA) in
increments of 0.1A.
The MH-C9000 has 5 operational modes: Charge, Refresh & Analyze, Break-In, Discharge and Cycle. Charge mode recharges
your batteries at the selected rate, and is suitable for frequently-used batteries.
Refresh & Analyze charges batteries, rests for two hours, discharges, rests again, and then recharges the batteries at
selectable charge and discharge rates. This mode is well suited to batteries stored for more than 2 weeks but less than 3
months, or for those demonstrating poor performance.
Break-In mode, otherwise known as IEC capacity measurement and "Battery Forming," charges and discharges the batteries
at a fraction of their full capacities. It charges them at 0.1C for 16 hr, rests for an hour, discharges them at 0.2C, and then
recharges them once more at 0.1C for 16 hr, where C is the battery capacity. It is best used for new batteries or those stored
for longer than 3 months, and chemically reactivates the battery after the deactivation that occurs with long-term storage.
Discharge mode simply discharges your batteries at the chosen rate, and is useful for analyzing the amount of charge stored in
the battery. Cycle performs a charge-discharge cycle for up to 12 times, with discharge capacity stored in memory for display
on command, and then recharges the batteries following the final cycle.
The charger also performs Battery Matching, which enables you to group batteries with similar actual capacity--within
approximately +/-5% of the rated capacity--in the device you want to power. When batteries are used together in a device,
performance is limited to the worst one. But by using the Refresh & Analyze mode on this charger, you can match batteries
with the same performance and then group them together, knowing that the full performance potential should be realized in the
device you use.
The MH-C9000 charger utilizes independent negative delta V charge control and has temperature and timer protection to
eliminate over- and under-charging. It comes with a 100-240V power adapter, and is also compatible with a 12V input. When
used with the optional cigarette lighter adapter (not included), the charger will work in your car.
Charges 1-4 AA or AAA NiMH or NiCD batteries via 4 independent slots. Supports batteries with capacities of
100-20,000mAh
Large, backlit LCD screen displays capacity, voltage, elapsed time and current
29 selectable charge and discharge rates, including 19 charging currents from 0.2-2.0A (200-2000mA) and 10
discharging currents from 0.1-1.0A (100-1000mA) in increments of 0.1A
5 operational modes: Charge, Refresh & Analyze, Break-In, Discharge and Cycle
Charge mode recharges your batteries at the selected rate, and is suitable for frequently-used batteries
Refresh & Analyze charges batteries, rests for an hour, discharges, rests again, and then recharges the batteries at
selectable charge and discharge rates. This mode is well suited to batteries stored for more than 2 weeks but less than 3
months, or for those demonstrating poor performance
Break-In mode, otherwise known as IEC capacity measurement and "Battery Forming," charges and discharges the
batteries at a fraction of their full capacities. It charges them at 0.1C for 16 hr, rests for an hour, discharges them at 0.2C,
and then recharges them once more at 0.1C for 16 hr, where C is the battery capacity. It is best used for new batteries or
those stored for longer than 3 months, and chemically reactivates the battery after the deactivation that occurs with
long-term storage
Discharge mode simply discharges your batteries at the chosen rate, and is useful for analyzing the amount of charge
stored in the battery
Cycle performs a charge-discharge cycle for up to 12 times, with discharge capacity stored in memory for display on
command, and then recharges the batteries following the final cycle
Performs Battery Matching, which enables you to group batteries with similar actual capacity--within approximately +/-5%
of the rated capacity--in the device you want to power. When batteries are used together in a device, performance is
limited to the worst one. But by using the Refresh & Analyze mode on this charger, you can match batteries with the same
performance and then group them together, knowing that the full performance potential should be realized
Utilizes independent negative delta V charge control and has temperature and timer protection to eliminate over- and
under-charging
Comes with a 100-240V power adapter, and is also compatible with a 12V input. When used with the optional cigarette
lighter adapter (not included), the charger will work in your car
Copyright 1993-2013 Maha Energy. All Rights Reserved.
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Thank you for purchasing the Powerex MH-C9000 Charger-Analyzer. Read these instructions carefully and thoroughly before operating this unit. IMPORTANT SAFETY INSTRUCTIONS. READ AND SAVE THESE INSTRUCTIONS.
OPERATING THIS PRODUCT INCORRECTLY CAN CAUSE DAMAGE TO THE BATTERIES.
READ MANUAL COMPLETELY BEFORE USE.
GENERAL PRECAUTIONS · Do not charge battery cells other than NiMH or NiCD. Please check
with the battery manufacturer to ensure it can accept the programmed charging and discharging rates. Do not expose the unit to rain or moisture due to the risk of fire.
· Do not operate the charger if it appears damaged in any way.
· Always place the battery cells with positive tip facing the top. Incorrect polarity may cause fire or explosion. Observe polarity diagrams located on the charger.
· Do not allow the unit to be exposed to direct sunlight. Operate in a well-ventilated area. Do not place unit on the carpet.
· Do not allow the battery terminals to become shorted.
· To reduce the risk of damage to the power cord, always pull by connector rather than the cord.
· Use only the supplied adapter or optional regional and car adapter offered by Maha Energy. Using third party accessories voids the product warranty.
FEATURES & SPECIFICATIONS · Four independent slots for AA or AAA NiMH batteries.
· Backlit LCD display.
· Digitally displays capacity, voltage, time and current.
· Five modes of operation: Charge, Refresh & Analyze, Break-In, Discharge and Cycle.
· 19 selectable charging current from 0.2A to 2.0A.
· 10 selectable discharging current from 0.1A to 1.0A.
· Worldwide power supply.
Charging Current: Programmable from 0.2A to 2.0A in
increments of 0.1A
Topoff Charging Current: 100mA
Maintenance Charging Current:
10mA
Discharge Termination: Voltage 0.90V
Discharging Current: Programmable from 0.1A to 1.0A in increments of 0.1A
Capacity Storage Memory: 12 (Cycle mode only) Supported Capacity*: 100 to 20,000mAh
Charger Input Power: 12V 2.0A
Adapter Input: 100-240V 50/60Hz
* Always ensure that the batteries can accept the programmed rates.
GENERAL BATTERY EDUCATION What is 0.1C, 0.2C, etc? “C” stands for the battery capacity and the number preceeding it is the fraction of the battery capacity. For example, 0.1C means 0.1 times the capacity for the battery. For a 2700mAh battery, 0.1C would be 0.1 times 2700mAh which equals 270mA. Choosing the right charging & discharging rate Charging at a rate below 0.3C and above 1.0C is not recommended. Charging too slow may prevent the charger from terminating correctly. Charging too fast may damage the battery. Typically speaking, slower charging rate will yield better battery performance but requires longer time. Faster charging rate may not charge as fully and battery temperature can be higher. As for the discharging rate, do not exceed 1.0C. Battery Matching In most devices, usually two or more batteries are used together. When batteries are used in a series, the performance is limited by the worst one. In other words, one poorly performing battery can significantly reduce the device runtime. Battery matching refers to grouping batteries with similar “actual” capacity. To perform this, use the Refresh & Analyze mode to determine the battery capacity. Group batteries with capacity within about +/- 5% of the rated capacity. Battery “Forming” New batteries and those stored for extended period become chemically deactivated. Battery forming is a charge-discharge-charge cycle which forces a full charge into the battery at a very slow rate. This process activates the battery. In certain cases, it needs to be repeated two or three times. Battery forming can be performed using the Break-In mode.
MH-C9000 WizardOne Charger-Analyzer
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MODES OF OPERATION This section describes the various modes and when to use them. To enable each mode, refer to the “Operation” section. Charge Mode · Recharges the battery at the selected rate.
· Useful when battery needs to be recharged without determining the capacity of the battery. It should be used on batteries known to be in good condition and have been in continuous use.
· Requires the least amount of time.
Refresh & Analyze Mode · First recharges the battery, rest for two hours, discharges, rest, then
recharges again. Charging and discharging rates are programmable.
· Reports the discharge capacity at the end of the cycle.
· Useful when the battery capacity needs to be determined. Also useful for battery with degraded performance.
· Recommended once every ten cycles for NiMH batteries.
Break-In Mode (IEC capacity analysis) · Applies a 16-hour 0.1C charge (0.1 times the capacity of the
battery), rest of one hour, followed by a 0.2C discharge, rest again, and finally a 16-hour 0.1C recharge again.
· Recommended for brand-new batteries. This process is also known as “Forming Charge.” Also recommended with batteries that cannot be rescued by the Refresh & Analyze mode.
· Recommended once every 30 cycles for NiMH batteries.
· Requires 39 to 45 hours to complete.
· The process follows the IEC standard for determining battery capacity.
Discharge Mode
· Discharges the battery at the selected rate.
· Useful for analyzing the amount of charge stored in the battery. Battery not recharged at the end of the cycle.
Cycle Mode · Performs a charge-discharge cycle for a programmable number of
times. Charging and discharging rates are also selectable. At the end of the cycle, a final recharge is applied.
· Suitable for cycling the batteries multiple times.
The following table summarized the recommended mode for typical battery conditions:
Battery Condition Mode
Brand-new batteries
Break-In
NiMH batteries that have been used frequently (at least once every two weeks)
Charge
Batteries in storage for more than two weeks but less than 3 month
Refresh & Analyze
Batteries in storage for more than 3 month
Break-In
Battery Rescue Steps For batteries that do not perform favorably after using the mode recommended above, the following sequence can be applied. 1. Refresh & Analyze for one to three times.
2. If capacity is still low, use Break-In mode.
3. If the step 1 to step 2 shows some capacity improvement (> 10%), repeat Break-In mode for one to three times. If no significant improvement is observed, battery probably at end of useful life.
OPERATIONS 1. Connect the power adapter DC connector to the charger.
Plug the power adapter into a compatible outlet.
TIP: When operating the charger outside of its intended region of use, simply use a plug-changer (Maha part number MHS-TC400 worldwide plug-changer kit). Transformer is not necessary.
2. Raise the lift rod located on the backside of the charger. 3. Insert AA or AAA battery.
Insert the negative end first, as shown below.
Inserting AA / AAA batteries
TIP: If charging two batteries, inserting them in the first and fourth slot offers better cooling and lowers battery temperature. NOTE: It is normal for the batteries to become hot during charging and discharging. It is also normal for a faint noise to emanate from the charger during operation.
4. When a new battery is detected, the LCD will display an arrow below
the bank number and prompt for the mode by flashing “MODE”.
Use the UP and DOWN arrow keys to choose the desired mode. Press ENTER to make the selection. If no key is pressed within ten seconds, the charger will proceed to the default mode which is charging with 1000mA rate.
If more than one battery is inserted at a time (without key press), the charger will prompt for programming in the order in which the batteries were inserted.
5.
If CHARGE mode is selected:
The charger will prompt for the charging rate by flashing “SET CHG RATE.” Use the UP and DOWN key to select the desired current. Press ENTER to make the selection. Refer to the “General Battery Education” section on choosing an appropriate rate.
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If REFRESH & ANALYZE mode is selected:
The charger will prompt for the charging rate by flashing “SET CHG RATE.” Use the UP and DOWN key to choose the desired current. Press ENTER to make the selection.
Then the screen will prompt from the discharging rate by flashing “SET DISCHG RATE.” Follow the same procedure as above.
If BREAK-IN mode is selected:
The charger will prompt for the battery capacity in order to calculate the charging and discharging rate automatically. “SET BATTERY CAPACITY” icon will flash. Use the UP and DOWN key to choose the desired current. Press ENTER to make the selection.
If DISCHARGE mode is selected:
The charger will prompt for the discharging rate by flashing “SET DISCHG RATE.” Use the UP and DOWN key to choose the desired current. Press ENTER to make the selection.
If CYCLE mode is selected:
The charger will prompt for the charging rate and discharging rate similar to the other modes. In addition, it will also prompt for the number of cycles to be performed by flashing “SET CYCLES.” Use the UP and DOWN keys to choose the desired cycles. Press ENTER to make the selection.
6. To ensure safety, the charger performs a battery health “impedance
check” at the beginning of the program. If the battery fails this test, “HIGH” would be displayed and program will be terminated.
Typically alkaline and extremely aged battery will fail this test. For a rechargeable battery, it is recommended for the battery to be discarded. NOTE: This test is not performed for the discharge mode. If this detection is believed to be incorrect, a discharge can be performed first.
7. When the programs are in-progress, the charger will display the
battery status for each occupied slot consecutively. The screen will first show an arrow below the active bank and display the information. The next slot(s) occupied follows.
Press the SLOT button at anytime will jump to the next occupied slot. Press this button multiple times if necessary to go to the desired slot. The following information is displayed on the screen: Current
:
This is the number followed by the unit “MA.” This is the approximate charging or discharging current. Note that this number will go up and down due to the pulse charging.
Capacity
:
This is the number followed by the unit “MAH.” This is the accumulated charging or discharging capacity. If it is charging capacity, “CHARGE” in black box will be shown. If it is discharging capacity, “DISCHG” in black box will be shown.
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Note the charging capacity is usually higher than the actual capacity of the battery owing to some energy lost as heat. Charging capacity cannot be used to judge the performance the battery. Instead, it can only be used to determine the progress of the charger. It is normal for this number to exceed the actual capacity by as much as 20-30%.
Q: I see that the charging capacity is much higher than the capacity I programmed. Why doesn’t the charger terminate correctly? A: The charger terminates by voltage and by temperature simultaneously. For certain older (and low quality) batteries, they do not produce the proper end-of-charge signal (a small voltage drop at the conclusion of the charge) needed for the charger to stop. At the same time, the battery temperature failed to reach the termination limit as the charging rate was probably too low. To address this issue, you should attempt to perform a BREAK-IN mode on the batteries first. You should also use a higher charging rate.
Q: Using the BREAK-IN mode, I am seeing a charging capacity much higher than the capacity I programmed. A: When using the BREAK-IN mode, the charger puts in 1.6 times the capacity of the battery (entered at the start of the charge). This does not cause any harm to the battery as the charging rate is very low (only 10% of the battery capacity). The increased total charging capacity compensates for energy lost as heat.
Time
:
This is the number followed by the unit “MIN.” This is the time elapsed for the particular routine such as charging, discharging or rest in the program.
Voltage:
This is the number followed by the unit “VOLT.” It represents the battery voltage. If you compare this with a voltmeter while charging, the values will not match as a voltmeter is unable to measure the battery voltage during charging or discharging.
At any given time during the program, the charger will either be charging, discharging or resting. The LCD displays the action in black boxes containing CHARGE, DISCHG, or REST.
8. If CYCLE mode is selected, it is also possible to review the battery capacity of the completed cycle after the first cycle finishes.
Press the UP or DOWN key while the active slot is in the cycle mode will display the discharge capacity for that cycle. The LCD will also display “CYCLE HISTORY.”
9. When the program for a slot is completed, DONE will displayed to
the right of the bank number. With the exception of DISCHARGE mode, topoff charge and trickle charge (continuous) will be applied. For CHARGE mode, the total charged capacity will be displayed. For REFRESH & ANALYZE, BREAK-IN, DISCHARGE mode, the total discharge capacity will be displayed. “AVAILABLE CAPACITY” icon will also be shown. For CYCLE mode, the discharge capacity of the final cycle is displayed. “CYCLE HISTORY” icon will also be shown. Use the UP and DOWN key to access discharge capacity for all the cycles performed. The capacity information will be stored as long as the battery is inserted in the charger. It will be lost upon removal of the battery.
Warning! Batteries should be disposed of seperately from the municipal waste stream via designated collection facilities appointed by the government or the local authorities. For more detailed information about the disposal of batteries, please contact your city office, waste disposal service or the shop where you purchased the product.
Manufactured By: MAHA ENERGY CORP. 1647 Yeager Ave. La Verne, CA 91750 USA Tel: 1-800-376-9992, 1-909-392-1568 http://www.mahapowerex.eu/ Copyrighted ® 1993-2007 Maha Energy Corp.
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Basic Operations
What are the recommended charging and discharging current for my battery?
The recommended charging current is 0.5C, or 0.5 times the battery capacity. The
recommended discharging current is 0.25C, or 0.25C times the battery capacity. Here are
some settings for common batteries:
2700mAh Charge: 1300mA Discharge: 700mA
2650mAh Charge: 1300mA Discharge: 700mA
2500mAh Charge: 1200mA Discharge: 600mA
2300mAh Charge: 1100mA Discharge: 600mA
2200mAh Charge: 1100mA Discharge: 600mA
2100mAh Charge: 1000mA Discharge: 500mA
2000mAh Charge: 1000mA Discharge: 500mA
1000mAh Charge: 500mA Discharge: 200mA
900mAh Charge: 400mA Discharge: 200mA
850mAh Charge: 400mA Discharge: 200mA
Is there a way to charge batteries without pressing buttons?
Yes! The charger defaults to CHARGING mode at 1A if no button is pressed 10 seconds
after inserting the batteries. This is the default auto charging mode and does not require
you to program the charger.
My brand new Powerex batteries are showing a lower capacity than the label in theMH-C9000? Should I return these batteries?
When tested using the REFRESH/ANALYZE mode, the capacity will be lower than the
capacity on indicated on the battery. To obtain a capacity that is closest to the rated
capacity, use the BREAK-IN mode, which is similar to the process used by manufacturers
to test and rate the batteries.
Furthermore, most batteries have a typical and minimum capacity. The Powerex
2700mAh batteries, for instance, has a 2700mAh typical capacity and a 2500mAh
minimum capacity. Therefore, a Powerex 2700mAh that tests to be higher than 2500mAh
using the BREAK-IN mode is considered within specification.
The charger only allows capacity (in the BREAK-IN mode) to be entered in incrementsof 100 mAh. My battery is 2650 mAh. How do I enter that capacity?
Simply round up to the next capacity. For 2650 mAh battery, use 2700mAh capacity.
Can I leave batteries in the charger? Does the charger keep the batteries topped off?
Upon completing the charge, the MH-C9000 goes to a very slow charge current (less than
10 mA) to keep the battery topped off. This "trickle charge" stops only when the batteries
are removed. It is okay to keep the batteries in the charger as the batteries will always be
ready for use. However, exercise common sense when keeping appliances constantly
plugged in the wall.
Using the BREAK-IN mode, I am seeing a charging capacity much higher than thecapacity I programmed. Why is the battery overcharged?
When using the BREAK-IN mode, the charger puts in 1.6 times the capacity of the battery
(entered at the start of the charge). This does not cause any harm to the battery as the
charging rate is very low (only 10% of the battery capacity). The increased total charging
capacity compensates for energy lost as heat. This is the charging scheme recommended
by International Electrotechnical Commission (IEC).
I am charging some older batteries and see that the charging capacity is much higherthan the capacity I programmed. Why doesn’t the charger terminate correctly?
The charger terminates by voltage and by temperature simultaneously. For certain older
(and low quality) batteries, they do not produce the proper negative delta V signal (a small
voltage drop at the conclusion of the charge) needed for the charger to stop. At the same
time, the battery temperature failed to reach the termination limit as the charging rate was
probably too low.To address this issue, you should attempt to perform a BREAK-IN mode
on the batteries first. You should also use a higher charging rate.
I am charging some older batteries and see that the charging capacity is much higherthan the capacity I programmed. Why doesn’t the charger terminate correctly?
The charger terminates by voltage and by temperature simultaneously. For certain older
(and low quality) batteries, they do not produce the proper negative delta V signal (a small
voltage drop at the conclusion of the charge) needed for the charger to stop. At the same
time, the battery temperature failed to reach the termination limit as the charging rate was
probably too low.To address this issue, you should attempt to perform a BREAK-IN mode
on the batteries first. You should also use a higher charging rate.
When using higher charging current, the charging capacity seems to reduce. Is thisnormal?
When charging at higher current, the charge completeness reduces thereby lowering the
charging capacity. This is to prevent battery overheating. This typically occurs at a rate
greater than 1500mA. Generally speaking, 1000mA achieves nearly full charge
completeness for AA batteries.Even after the charge ends (DONE appears on screen),
the charger will apply a topoff charge and continuous maintenance charge. Despite that
the capacity on the screen no longer increases, the batteries are being topped off.If you
would like to achieve better charge completeness at higher currents, a small fan can be
added to cool the batteries externally.
Why is it not recommended to charge battery below 0.33C?
When charging below 0.33C (except in BREAK-IN) mode, the batteries may not produce
a sufficient end-of-charge signal for the charger to terminate correctly. Although the
temperature sensors will safeguard battery overheating, lower charging rate might not
cause enough heating in the batteries to trip the sensors.If low charging rate is desired,
you should use the BREAK-IN mode. Charging in that mode is terminated by only time
(1.6 times battery capacity) and temperature.
After the charge begins, why do I see an abnormally high voltage (~ 1.6V to 2.0V) onthe screen?
In the first few seconds, the MH-C9000 performs a proprietary “high impedance” check to
filter out batteries unsafe to charge including non-rechargeable batteries. During this time,
a high current is applied and voltage measured to determine the impedance of the
battery.In the first few seconds, the MH-C9000 performs a proprietary “high impedance”
check to filter out batteries unsafe to charge including non-rechargeable batteries. During
this time, a high current is applied and voltage measured to determine the impedance of
the battery.
Why doesn’t the charging and discharging current reach the set values exactly? Ithought the charger is supposed to be precise.
The charging and discharging current are pulsed, thereby causing the displayed current to
go up and down. The capacity calculation is based on the actual current rather than the
set current so capacity calculation remains accurate.
I am using the CHARGE mode. Why is the capacity different than my battery capacity?
The capacity displayed in any charging process is called the “charging capacity.” This is
the amount of energy put into the batteries. This number does not equal to the battery’s
capacity as it is dependent on the amount of charge already in the battery as well as the
battery’s internal resistance.For example, a half used 2000mAh battery may only show a
charging capacity of 1000mAh since the battery is half full.It is normal for the charging
capacity to exceed battery capacity by as much as 30% depending on battery brand and
charging rate.To determine the battery’s useful capacity, you must look at a “discharge
capacity.” Such information is available in the REFRESH & ANALYZE, BREAK-IN,
DISCHARGE, and CYCLE modes. Note that the battery is not recharged in the
DISCHARGE mode.
To determine the battery’s useful capacity, you must look at a “discharge capacity.”Such information is available in the REFRESH & ANALYZE, BREAK-IN, DISCHARGE,and CYCLE modes. Note that the battery is not recharged in the DISCHARGE mode.
If charging or discharging is in-progress, a blackbox contain either CHARGE or DISCHG
will be displayed on the screen. The capacity shown during charging is always the
charging capacity. Similarly, the capacity shown during discharging is the discharging
capacity.In the CHARGE mode, the final capacity displayed (after DONE appears) is the
charging capacity.In the REFRESH & ANALYZE and BREAK-IN mode, the final capacity
displayed is the discharging capacity. The battery have also been recharged after the
discharge.In the DISCHARGE mode, the final capacity displayed is also the discharging
capacity. However, the battery is not recharged.In the CYLCE mode, the capacities saved
in memory always refer to the discharging capacity.
There is an arrow that moves below the slot number. What does it mean?
The LCD screen displays information a slot at a time. The information (capacity, current,
time, voltage) is displayed twice before moving on to the next slot. The arrow points to the
slot reporting.
Is it normal for the batteries to get warm during charging?
Yes, batteries do get warm during the charge due to both internal heat and heat produced
by the charger. Lower charging rate can yield lower battery temperature, but it is not
recommended to go below 0.33C or 0.33 times the battery capacity. Adding an external
fan can also cool the battery.
The manual makes recommendations for charging rates. How about discharging rate?
Most NiMH batteries can accept discharge rate up to 3 times its capacity. A higher
discharge rate will yield lower capacity.For accurate capacity measurement, use the
BREAK-IN mode which complies with IEC standards (0.2C discharge rate).
Is the MH-C9000 compatible with the new "low self-discharge" batteries (e.g. SanyoEneloop)?
Yes. Follow the same charging rate recommendations for general NiMH batteries.
What is the maximum capacity supported by the MH-C9000?
The maximum capacity supported (BREAK-IN mode) is 20,000mAh making it compatible
with future technologies.
The charger cannot detect my battery. What can be done?
Virtually all batteries can be detected by the charger. Therefore, if a battery cannot be
detected, it is likely not making good contact with the charger. This can be caused by
improper seating of the battery or battery not meeting the IEC dimension standard. Try
rotating the battery or placing it in another slot.
There is a faint noise emanating from the charger. Is this normal?
The charger can produce some high frequency hum, which is generated by the high
frequency pulse charging and switchers.
Why doesn't the charger show "DONE" instantly when I insert fully charged batteries?
The charger takes several minutes to detect whether or not a battery is fully charged. It is
normal for the charger to put in a small amount of charge to fully charged batteries.
The charger takes several minutes to detect whether or not a battery is fully charged.It is normal for the charger to put in a small amount of charge to fully chargedbatteries.
Your unit may be faulty. Please contact Maha support for warranty services.
Advanced Operations
I multiplied the charging time by the current. The resulting capacity is not the same asthe capacity on the screen. Is the charger faulty?
No. The charging current displayed on the screen does not include a brief rest period (a
fraction of a second every two seconds). Therefore, the actual charging current is about
90% of the displayed value.
No. The charging current displayed on the screen does not include a brief rest period(a fraction of a second every two seconds). Therefore, the actual charging current isabout 90% of the displayed value.
Discharging prior to BREAK-IN mode is optional. Overcharging during the BREAK-IN
mode does not harm battery as the charging current is very slow.
The MH-C9000 is showing "HIGH" error for my batteries, but it charges fine in otherchargers. What can be done?
The MH-C9000 features a high impedance tester which can screen for
defective/damaged battery. Most consumer chargers on the market does not have this
feature, and therefore will allow charging batteries not may no longer be suitable for use.
Maha recommends that batteries triggering a "HIGH" error be disposed for safety
reasons, as charging damaged batteries may result in overheating or
explosions.However, if you feel the HIGH error is due to a false detection, try charging the
battery first in another charger, or drain the battery first using the DISCHARGE mode on
the MH-C9000. This is recommended only for advanced users.
How does the MH-C9000 detect end-of-charge signals from the batteries?
The MH-C9000 uses a combination of Negative Delta V, Zero Delta V, Peak Voltage, time
and temperature to determine the end-of-charge. In addition, proprietary algorithms are
used.
Copyright 1993-2013 Maha Energy. All Rights Reserved.
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