I can second that. I had my mac book battery - that was dying anyway -
completely die on me after leaving it in the car for a week over the
Christmas period last year. The combination of the cold weather and the
lack of charge caused the battery to go below a threshold, and hence,
the battery would never charge again. However, I believe that this
minimum charge threshold is actually built into the battery control
electronics rather than the battery itself.
That is to say, If I could have bypassed the controller and charged it
back up manually, I believe that I would have got some further use out
of the battery... But after having a Li battery blow on me before, I was
reluctant to try it.
On 12/06/2011 01:01 PM, Vic wrote:
>> Li batteries have good charge densities but don't last that
>> long unless they are charged and discharged evenly (apparently).
> It's even more complicated than that...
>
> Li batteries suffer permanent degradation with time. The rate of
> degradation is increased with heat and with charge.
>
> So it would be reasonable to assume that it is best to keep a Li battery
> discharged, and then charge it just before it needs to be used. And that
> would be wrong; Li batteries that go into deep discharge die immediately.
>
> I've given up on trying to keep them running. I just buy el cheapo units
> from China and expect them to last somewhere around a year.
>
> Vic.
>
>
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