Nice discussion on the follow mails, but i've a doubt On Sun, Aug 2, 2009 at 7:07 PM, Paul Fertser <fercer...@gmail.com> wrote:
> Hi, > > This is a text version of the wikipage [1], feel free to ask new questions > there on the talk page. Discussion on this ML is also appreciated (and > in fact i'm more comfortable with ML than the wiki). > > Openmoko devices > Battery questions and answers > > NB: Some of the described behaviour depends on the kernel, the > relevant code was pushed on 02 Aug to andy-tracking > > > Hardware capabilities > > Q: What batteries can be used with gta01 and gta02? > A: Original OM gta01, gta02, Nokia BL-5C, BL-6C and compatibles. > > Q: Do other BL-5/6C compatible batteries fit? > A: If the battery is thicker than BL-6C, you won't be able to close > the back cover. > > Q: What is the difference between all those types? > A: > > Capacity: > gta01, gta02 - 1200 mAh > BL-5C old (newer/new) - 850 (970/1050) mAh > BL-6C - 1150 mAh > > Temperature control: > gta01, BL-5C, BL-6C - thermistor > gta02 - bq27000 > > Special features: > gta02 - accurate and sophisticated reporting of capacity, > time_to_full, time_to_empty, temperature and battery current during > both charge and discharge thanks to bq27000 (aka Coloumb Counter) > > Q: What are hardware capabilities of gta01 and gta02 with regard to > battery management? > A: > > gta01: charging all battery types, measuring temperature with > battery-integrated thermistor (currently charging and measuring > temperature for non-gta01 batteries doesn't work due to the kernel > driver issues but it's software limitation), measuring battery output > voltage, very inaccurate and noisy measuring of battery current > > gta02: charging all battery types, measuring battery output voltage, > communicating with bq27000 > > Q: Can nokia phones use/charge gta01/gta02 batteries? > A: gta01 and gta02 batteries will fit wherever BL-6C fits but they > can't be charged in nokia phones unless you isolate the middle pin > from the battery and connect a resistor of ~50k (actual measured value > on a cold (25C) battery is 75k, on a slightly warm battery - 82k) from > it to the ground (to fake a thermistor presence). > > Q: Can third-party chargers charge gta01/gta02 batteries? > A: The "good" ones will most probably require the same trick needed > for nokia phones. More cheaper ones are more likely to ignore > thermistor absence. > > Q: I have several compatible batteries. What are the storage > requirements for them? > A: Keep in a dry cool place charged to no more than 75%. > > > Safety issues > > Q: Do OM devices control temperature to stop charging if the battery > gets too hot? > A: No (probably gta01 does, need to check). > > Q: Isn't it dangerous? > A: No, since all batteries (not raw cells!) have an integrated > protection circuits. > > Q: Can i use that fancy 2800 mAh BL-5C-compatible battery i saw on > ebay? > A: Unless you want an explosion in your pocket i wouldn't recommend > using any battery that is not produced by a reputable vendor and > widely tested. And even reputable vendors make mistakes, nokia once > had to recall 46 million batteries manufactured by Matsushita ( > > http://batteryreplacement.nokia.com/batteryreplacement/en/advisory-2007.html > ). > > Q: You say that BL-5C is compatible with my gta02. Does that mean i > can use that BL-5C-compatible bat i bought for a buck from a bum? > A: You bet, go ahead. > > > Charging > > Q: My battery charges to 100% but then charging stops and the battery > keeps discharging, wtf? > A: LiIon batteries don't like to be kept fully charged, so the charger > stops as soon as charging current becomes less than threshold. If you > have GSM on it will discharge the battery. > > Q: But why doesn't it ever stop charging on my device? > A: The GSM modem is connected directly to the battery terminals so if > it's active, charger will think it's still charging the battery and > won't turn off unless GSM becomes inactive. The default threshold is > about 16mA, the latest Qi increases the threshold to ~32mA. Is this true for gta02 deevices only or it's the same for gta01? > > > Q: Does it mean if i leave my phone plugged it will eventually fully > discharge the battery? > A: On gta02 the charger will restart the charge automatically once the > battery voltage reaches ~4V which corresponds to ~76%. Not sure about > gta01, requires more investigation. :-/ > > Q: Ok, how to make sure my battery is fully charged before a long > trip? > A: Replug the charger, it will trigger charging no matter what the > current capacity is. > > Q: My power/aux LED indicates charging/discharging/whatever, what does > that mean (aka why it's still blue even after i unplugged the > charger)? > A: Ask FSO guys about it, some of them think that the user shouldn't > really know what's happening and therefore they do some special > mangling of "status" sysfs node before presenting it to the user. If > you want to make a decent bugreport please add clear steps to > reproduce and /sys/class/power_supply/battery/uevent contents for all > relevant states. > > > Using compatible batteries with gta02 > > Q: So, how do i use "dumb" batteries with my freerunner? > A: > > First you need to unbind bq27000 driver: > echo bq27000-battery.0 > /sys/bus/platform/drivers/bq27000-battery/unbind > > Then you load the dumb battery driver: > modprobe gta01_battery > > If you need to use bq27000 driver again, do: > rmmod gta01_battery > echo bq27000-battery.0 > /sys/bus/platform/drivers/bq27000-battery/bind > > If you use Enlightment you might need to restart it after that. > > Q: Is capacity reported for dumb batteries accurate? > A: During discharge it should be pretty (+-10%) accurate, during > charge the capacity reported is ~20% more than real. > > Q: Why does /sys/class/power_supply/battery/charge_full says i have a > 850 mAh battery no matter what i use? > A: It's a workaround to make popular battery gadgets work with this > driver. > > > This Q&A were prepared by > Paul Fertser <fercer...@gmail.com> > Joerg Reisenweber <jo...@openmoko.org> > > [1] http://wiki.openmoko.org/wiki/Battery_Questions_and_Answers > -- > Be free, use free (http://www.gnu.org/philosophy/free-sw.html) software! > mailto:fercer...@gmail.com > > _______________________________________________ > Openmoko community mailing list > community@lists.openmoko.org > http://lists.openmoko.org/mailman/listinfo/community > Regards, -- ___________ Rafael Campos o0 Methril 0o http://openblog.methril.net/
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