the empty set

Lithium-based battery usage

This might interest PowerBook / iBook / cell phone users. According to a paper on,

&quote; [..] a lithium-ion battery provides 300 to 500 discharge/charge cycles. The battery prefers a partial rather than a full discharge. Frequent full discharges should be avoided when possible. Instead, charge the battery more often or use a larger battery. &quote;
Lithium-based batteries have a lifetime of two to three years, and the speed at which the they age is function of temperature and state-of-charge.
&quote; If possible, store the battery in a cool place at about a 40% state-of-charge. This reserve charge is needed to keep the battery and its protection circuit operational during prolonged storage. The most harmful combination is full charge at high temperature. &quote;
The bottom line is to avoid full discharges, recharge more often. Keep the Lithium-ion battery cool but do not freeze. Avoid a hot car.

2003-03-15 update: MacOSXHint has a very interesting article on how to give your PB battery a checkup
2003-03-24 update: Batteries in a portable world, another interesting article

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Reponses to “Lithium-based battery usage”

#1 by Dave

19:43 on 20 December 2003

I think it's OK (if not preferred) to freeze a lithium battery for storage. BatteryUniversity says not to freeze, but their tablulated data shows differently. I think they mis-stated the freeze thing.

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