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Old 12-18-2005, 06:40 AM   #1
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Default battery Mah question

I'm working with 5cell Micro packs made with 2/3A cells. The Cells are marked 1200MAh. After discharging to 0.9v/cell i can only get about 800mah into the pack. If i flatten the pack completly, dead shorted and cool. I can then get 1200 or so Mah into the pack then. Is this normal? I always tought that the Mah rating was to a certain level of discharge and not a total capacity. I am using an ICE charger if it matters. I've tried changing the charge and discharge rates and it dosent seem to help. Heres a link to the cells i am using http://www.onlybatteries.com/..%5Csh...p?ItemID=12472 any help wold be appreciated. I'm trying to figure out the whole battery game before i get into the $$$ batteries once my 1/10th comes with santa in a week
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Old 12-18-2005, 07:02 AM   #2
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Just wondering - why would you go with those cells instead of the IBs??? They're only like $.20 more per cell...
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Old 12-18-2005, 07:09 AM   #3
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always follow

discharge @ .9v/cell, charge, run, cool, discharge, charge(700mah), and store

well thats what i do..
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Old 12-18-2005, 07:33 AM   #4
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If its for a reciever pack just keep recharging the battery. Discharging and equalizing it raises the voltage and lowers the runtime.
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Old 12-18-2005, 10:00 AM   #5
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The reason i went with those at the time is they were on sale for .85 each! cant beat that price. So its normal that i cant get a full 1200 into them unless they are flat then. i wasnt sure.
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Old 12-18-2005, 12:19 PM   #6
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They may not be a quality cell, so the performance may be worse than advertised.

What is your discharge rate? High discharge rates will reduce the usable capacity significantly. Try discharging at 1A and see what capacity you get.

Also, one cell in your pack may be weak and bringing the whole pack down.
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Old 12-18-2005, 12:33 PM   #7
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There are 2 types of cells. Consumer type cells which are made for low amp draw applications and high drain type cells which are made for higher amp draw. The best high amp draw cell at the moment is the IB1200 then the next best one is the GP1100SCHR.

Another common thing is for some Chinese manufacturers to label cells higher than they are actually rated at. This is an attempt to move more product.

You can't really judge a cells capacity by the mAh it took as a charge. The only way is to test under discharge.
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Old 12-18-2005, 12:39 PM   #8
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Basically I would know go by any label...try the cells and see what performs the best. The Chinese as well as all battery manufacturers are "consistently updating their cells"....they cannot change the shrink wrap with every update...so therefore you may be getting a lot more than what the shrink wrap says.....

Food for thought......should make the Sub c races real easy to tech this year..........
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