That's exactly what I wanted to know. How was the SOC evaluated when the battery lost capacity. If there was some estimation on the battery loss or just a full capacity assumption and then early poweroff. I have several batteries, some of them pretty old (that's the idea). A couple of S/Ns:
00602080616110002384 00602080608110000600 I've been running olpc-pwr-log with depleted batteries to evaluate the battery condition, but since I wasn't sure how the SOC worked, I didn't know if the results were valid since I was having different starting points. Some batteries started from 5%, some from 10%, etc. Now I know that's probably correct anyways. Ismael 2011/3/24 Richard A. Smith <rich...@laptop.org> > On 03/24/2011 08:55 AM, Ismael Schinca wrote: > > Thanks, for starters this is really useful, because it's not at all > > similar to what I've been observed. The computer powers off with battery > > levels between 10-15% and the led starts blinking around 5-10%. I'm > > using several batteries on the same XO 1.0 computer. Granted, the > > batteries are not fresh ones, but that's exactly what I am trying to > > figure out. How the battery behaviour changes when battery capacity > > starts to decrease over time. > > Any additional information will be most welcome. > > What you are observing is exactly what will happen as the battery > reduces capacity. We don't have a calibration procedure so the SOC > assumes 3100mAh. The SOC is a mAh/1% counter. After so many mAh it > subtracts 1%. The critical level is a voltage reading. Its not coupled > to the SOC. So with a battery that has less capacity you will reach the > critical level sooner. > > Whats the serial number of your battery? You may also want to run a > olpc-pwr-log run with that battery so you can determine what the actual > capacity of the battery is. > > -- > Richard A. Smith <rich...@laptop.org> > One Laptop per Child > _______________________________________________ > Devel mailing list > Devel@lists.laptop.org > http://lists.laptop.org/listinfo/devel > -- Ismael Schinca Centro Ceibal - Depto. Técnico - I+D Avda. Italia 6201 - Edificio Los Ceibos Montevideo - Uruguay. Tel.: 2601 57 73 Int. 2232
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