| DevilsPGD 2005-05-19, 11:52 am |
| In message <42802658.E4ED0466@ddress.com> Notan <notan@ddress.com>
wrote:
>Ablang wrote:
>
>Yup.
>
>A charge cycle is a charge cycle, whether it's full, half, or whatever.
Most LiON batteries can put out a certain amount of power over their
useful lifetimes. If you can get 100 full discharge*/recharge cycles,
you'll get approximately 200 half discharge/recharge cycles.
There are a couple caveats.
1) Heat. LiON batteries get hot when they charge. Heat also damages
them. Typically the faster and the longer they're charging, the hotter
they get, so a full recharge is harder on the battery then recharging it
from 50%. However, some batteries heat up really fast, so in that case,
two half charges might be harder on it then one full charge. This
depends on the design of the battery more then anything else.
2) "Full Discharge" -- You should never fully discharge a LiON battery,
if you do, it's toast. However, most LiON batteries (and/or the devices
that use them) are smart enough to report the battery as dead and stop
working around 10%-15% of the batteries capacity. In many cases this
circuitry is part of the battery itself and the battery simply ceases to
function.
It's also worth noting that this circuitry cannot prevent the battery
from self-discharging, so you shouldn't store a LiON when it appears
completely dead (even if it's at the artificial "dead" cutoff and the
battery isn't dead enough to cause damage) since it will naturally drain
down.
--
#define QUESTION ((bb) || !(bb))
-- Shakespeare
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