The "C" in charge rate

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Joined: 02/14/2010
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The VRLA batts that will be in the bike I've ordered have a max charge rate of ".3C20A" There are five in the pack for 60V.

The vendor supplies a 5A charger.

I have a general purpose charger already that can go 2, 10, and 100 amps.

I'm tempted to think the batts can handle 20 amps, so if I figure out the connection types, 10 amps would be fine and quicker. But, that ".3C" I do not understand.

Sorry to be such a noob, but can someone expound on this?

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Joined: 06/22/2009
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Re: The "C" in charge rate

.3 C means three tenths of the battery rated capacity, or 6 amps maximum for a 20 ampere-hour battery! A 100 ampere hour battery, of similar type, would handle up to 30 amps maximum charging current. Do NOT use a 10 amp charger, it would give .5 C, which is too much! Charging too fast will shorten the battery life, and reduce the number of times it can be recharged successfuly.--Bob Curry

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Robert M. Curry

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Re: The "C" in charge rate

Great - thanks so much! I am so used to "answers" to my questions during the process of evaluating different bikes that your reply is much appreciated.

These batts are rated 50 aH. So...they can theoretically take 15 amps? ( BB EB-50 12)

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Re: The "C" in charge rate

Yes, at .3C, 15 amperes charging would be maximum, with a 50 AH battery pack.--Bob Curry

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Robert M. Curry

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Re: The "C" in charge rate

Excellent. Have a great weekend!

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Joined: 03/19/2010
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Re: ultracapacitor renew charge

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