[ltp] One battery or two?

[Michael Gaber]

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Christos Papadopoulos schrieb:
> Thanks for all the good info below. However, I have a few questions.
> 
> - Some people suggest unpluging the battery completely. I am a bit
>   concerned about that. What if you lose power, or trip over the chord?
>   Wouldn's sudden loss of power be bad for your laptop?

sure it would be. Not for the notebook itself (except evtl the hdd) but
for the data you're using at this moment. The first question here was
not about battery or not, but about 1 or 2 batteries

> - About setting the charge level low (say 40%). I interpret that to mean
>   that the battery will be allowed to discharge to 40% even if you are
>   plugged into wall power, and then recharge. If this happens everytime,
>   isn't that worse than letting your battery discharge to say 80% (for
>   1 hour of battery use) and then recharge?

nope. there are 2 files in smapi: start_charge_threshold (1) and
stop_charge_threshold (2). my current setting is (1) at 30% and (2) at
70% so my thinkpad will not charge the battery at all if it has between
30 and 70% of it's capacity. it will NOT discharge the battery while
plugged in, so you perhaps save yourself some cycles (doubt that) but
keep the battery away from the bad last 20 or so % which stress the
cells extremely when charged because the controller has to use high
voltages to charge the cells.

with this setting I'm currently at 16.38% capacity loss of my nearly 2
year old 9-cell battery of my t60 with 354 cycles on it

> 
> - If I set the recharge threshold to 40%, will my battery always discharge
>   and recharge? In other words, if I am plugged in, will it still go
>   through the charge cycles? If yes, how can that be good?
> 
> Christos.
> 

Greetings Michael

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