Re: Battery suggestions

On Wed, 30 Jan 2008 18:06:05 -0000, "PDR"
<peter.rieden@xxxxxxxxxxxxxxxxxxxxx> wrote:

The
lithium cells just need to be fully charged (usually around 90 minutes from
empty, but the charging systems vary so check your laptop instructions) and
then used. The laptop's battery management circuits will ensure the cells
aren't over-discharged, and lithium cells don't really care about
partial-vs-deep discharging, so the use pattern doesn't really affect them.

I recommend charging the battery in the laptop overnight before you
use it. That way you are ensured of a full charge. I wouldn't only
charge it for 90 minutes or even a few hours.

As far as battery life, I have heard that deep-discharging of lithium
ion batteries shortens their life.

Here's a link that explains it:

http://electronics.howstuffworks.com/lithium-ion-battery2.htm

A relevant part from that link:

"Lithium ion chemistry prefers partial discharge to deep discharge, so
it's best to avoid taking the battery all the way down to zero. Since
lithium-ion chemistry does not have a "memory", you do not harm the
battery pack with a partial discharge. If the voltage of a lithium-ion
cell drops below a certain level, it's ruined."

Here's my take on battery usage. I just leave the battery in all the
time. I always get the extended cell battery because it has enough
capacity to avoid deep discharges. I usually get a second extended
cell battery so that I can exchange batteries if convenient to avoid
going into a deep discharge for either battery.

For some reason, I tend to get excellent battery life. I think the
batteries start to degrade right after I sell the laptop! That's what
happened with my ex-fiance' :-)
.

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