Li-Ion life cycle management

May 20, 2008 22 Replies

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Yes and no - it is really semantics. Technically it is usable, but at your own peril in terms of degradation and subsequent decomposition, which can be hazardous. But in terms of sensible cyclic use you simply don't go there, and any pack protection module will prevent it in the interests of saving the cells to use again.

Have you read the Maxim data sheet yet?

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Not that i have heard of. Besides for an application like this i would look to zinc-air first. 25 year shelf life and good output when in use. Goes up to 72 hours after activation.

voltage,

and

tradeoffs

that

40-60%

higher

higher

from

(eg

do so

pains

isn't

avoid

a

I haven't used any Ultralife lithiums, but I can testify their alkalines suck. I have one device where the battery just plain won't work. I don't know if it is a mechanical issue or battery impedance. The Ultralife capacity, while I haven't measured it, doesn't match that of Sanyo or even those Costco batteries.

I have been using Sanyo ENELOOP AA cells. These are low self discharge NiMH. The self discharge is low enough that they are sold pre- charged.

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The claim is 85% capacity after one year.

The hybrid car folks use a short cycle scheme, something like 75% charge to 25 discharge. The claim is this provides longer life. You realize though that proving such claims takes a long time. In fact, most battery claims take way too long to prove. I mean, take a discharge rate at 0.1C. and do this over 1000 cycles. So that is 10000 hours, well over a year.

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