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Old Aug 5, 2009, 2:09 PM   #1
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Default MAHA C9000 Charger info

The instructions for the C9000 say to charge batteries at a minimum rate of 0.5 C. This means you should charge a 2000 mAh battery at minimum rate of 1000 mAh. Doing this causes the batteries to get very warm or even hot. A call to MAHA confirmed the 0.5 charging rate. The C9000 needs this rate to determine the proper end of charge time. A lower rate might cause the batteries to overcharge due to the algorithm used in the charger.

I also own MAHA's C401FS charger which provides a much lower charging rate of 300 mAh & the batteries stay cool. When I asked the MAHA tech about this, he said the C401FS uses a different algorithm.

So I guess I'll be using the C401FS for most of my battery charging duties.
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Old Aug 5, 2009, 2:48 PM   #2
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The way I read the C9000 manual (under General Battery Education), “Charging at a rate below 0.33C and above 1.0C is not recommended.” Therefore, using your old 401 charger at 300mA would violate this basic rule of battery charging. Besides...why would you want to spend 6 hours recharging your batteries? I charge mine at the 2000mA rate, and they don’t get too hot.

the Hun
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Old Aug 5, 2009, 3:44 PM   #3
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Default Maha c9000

My C9000 user manual, under "General Battery Education", states that "Charging at a rate below 0.5C and above 1.0C is not recommended." We must have different versions of their user manual (actually just a single sheet printed on both sides).

I use 2 sets of batteries, so charging for 6 hrs or even overnight is not an issue for me. I feel keeping the battery temp down is important to longer battery life.

Thanks for your quick response.

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Old Aug 5, 2009, 4:07 PM   #4
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http://www.mahaenergy.com/download/mhc9000.pdf

the Hun
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Old Aug 5, 2009, 5:09 PM   #5
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Default Maha c9000

Thanks Hun for the link. It looks like MAHA lowered the min charge rate from 0.5C to 0.33C. My charger is over 2 years old & its instruction sheet said min charge rate of 0.5C. That 0.33 charge rate should keep the batteries cooler. Next batch I'll try 0.33C.

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Old Aug 8, 2009, 5:42 AM   #6
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My cells don't get "hot" or even warm when charging at 1000 mA on the C9000. Possible these cells have high internal resistance?
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Old Aug 13, 2009, 10:23 PM   #7
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Default Powerex Maha MH-C9000

I found this page on the Powerex website that is very helpful.
http://www.mahaenergy.com/store/mhc9000faq.asp
It answers many specific questions including charging and discharging rates for typical batteries.
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Old Dec 28, 2009, 9:31 PM   #8
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Default 12 volt adapter?

Has anyone used their c9000 with the 12 volt adapter?
Does it work just as well as on 110v?


Can you use ANY 12 volt adapter with the right plug size or do you need to use a specific type adapter such as the one Maha sells? I note the back of the charger states 12v 2a input.


Thanks.

Last edited by Bax; Dec 29, 2009 at 12:50 AM.
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