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Old 10-26-2007, 03:34 PM   #1
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Default A little confused about charging

Ok I have a 2 part question about batteries.

For example: Lets say the batteries are unmatched EP4200 mAh built side x side.

1.What is the best way to charge a new NiMH 6 cell battery for the first time.
I have read that a slow charge (400mAh for 12 to 14 hours) is the best.
I have also read that the slow, uncontrolled (non-peak sensing) charge will damage a Nimh cell if the charge is not stopped when the cell is full. The "theory" behind C/10charging is the rate is so low as to not harm cells once full. This is not true and it will damage them.

2. If its bad to slow charge a pack, how does one equalize the pack without a tray.

Thanks
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Old 10-26-2007, 05:01 PM   #2
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I just cycle it 3 times. Let it cool for 5mins in between and mine are good to go.
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Old 10-26-2007, 05:38 PM   #3
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Quote:
Originally Posted by Bare Bones View Post
Ok I have a 2 part question about batteries.

For example: Lets say the batteries are unmatched EP4200 mAh built side x side.

1.What is the best way to charge a new NiMH 6 cell battery for the first time.
I have read that a slow charge (400mAh for 12 to 14 hours) is the best.
I have also read that the slow, uncontrolled (non-peak sensing) charge will damage a Nimh cell if the charge is not stopped when the cell is full. The "theory" behind C/10charging is the rate is so low as to not harm cells once full. This is not true and it will damage them.

2. If its bad to slow charge a pack, how does one equalize the pack without a tray.

Thanks
I would ask your battery provider what their charging recommendations are. If they are a reputable supplier, they should be able to tell you. If they can't, ask Trinity or someone else who sells the EP batteries. My guess is you probably just charge them normally. Like another poster said, maybe cycle them a couple times to get full power up before going racing. However, batteries are a big investment, I wouldn't listen to too many people here...not even me
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Old 10-26-2007, 05:54 PM   #4
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After the pack is built, put about 2000MaH into the pack at 5 amps. Store or let cool. Discharge pack to 5.4V then equalize the cells to .90V. Charge then at 6amps with 3mV peak detection.
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Old 10-26-2007, 08:41 PM   #5
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Thanks guys!! Much appreciated
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Old 10-26-2007, 09:58 PM   #6
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http://www.slingshotbatteries.com/ra...tructions.html

Here is a great article from slingshot about charging new batteries, it works quite well. Regardless of what your charging equalizing tray is a great thing to purchase if you don't already have one.
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Old 10-27-2007, 12:06 AM   #7
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Any know what the benefit of megaflex charging is over normal charging? Im using a Orion Advantage charger.
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Old 10-27-2007, 12:35 AM   #8
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Megaflex is only really needed for reviving older cells. I believe it just "burps" the cells to breakdown crystal or gas formations in the cells. I don't think anyone really uses it for modern cells anymore though.
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Old 10-27-2007, 02:27 AM   #9
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Rightio, ill keep using the spintec as it does the same thing more or less.
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