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03-08-2012 06:05 AM  6 years agoPost 1
cdrking

rrElite Veteran

Seattle

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If someone hands me a battery that has no label and no information about capacity, C rating and charge rate, how do I determine these things? Do I have to have expensive equipment or can I use a PowerLab 8 to find this information?

Thanks,

Jeff

To hover is divine, the alternative is rather PLANE.

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03-08-2012 06:50 AM  6 years agoPost 2
Gregor99

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Western Wa

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Capacity is not to hard. Discharge the pack with a Powerlab. Watch the cell voltage during the live discharge. It will steadily decline, then drop off suddenly. As soon as it starts to drop quickly, stop the discharge and check the mah out. that is probably approximately 90%-95% if the pack's originally rated capacity. Don't let it fall below 3.4v per cell during the discharge.

For the C rating, the IR can be a good indicator. Use the IR values with the spreadsheet from this post to get approximate C rating.

http://www.rcgroups.com/forums/show...01#post20484169

Max charge rate will be the hardest. In general, any pack 25c and above should be capable of at least 3c charge. For anything higher than that, I'd want really want to know the mfg supports it. 20c, keep it to 2c. Below 20c, its probably not worth keeping the pack.

What's the story behind the question? Have a pack like this, or just curious?

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