libera/#maemo/ Wednesday, 2020-06-03

MaxdamantusThis N810 battery seems to be working quite well. The device has been on without charging for around 8 days and the icon seems to show it still at around 75% (can't see an actual number).13:07
MaxdamantusSeems fairly low-power overall.13:07
MaxdamantusDunno if it goes into a sleep state.13:07
KotCzarnyo.O13:07
KotCzarnyafair my n800 ate through battery in ~7days13:08
MaxdamantusIt's not connected to wifi or anything.13:08
KotCzarnywhat is the battery voltage?13:08
MaxdamantusWonder how to tell without taking it out.13:09
MaxdamantusIt doesn't have the same chip as the N900 at least.13:10
KotCzarnythere was a tool for that i think13:10
KotCzarnyhttps://mrrau.eu:20281/n800/kcbatt/13:11
KotCzarnywritten by me, so might be awfully inacurate13:11
KotCzarnyfeel free to improve13:12
KotCzarnyand related post: https://talk.maemo.org/showpost.php?p=153728&postcount=1313:14
KotCzarnysee the last post of that thread13:22
KotCzarnyand whole thread has some nice notes13:22
Maxdamantusretu-adc #8: 450   batt:  52% [###___]  idle:154.0h idle(w/wifi):57.9h max:2.0h13:23
MaxdamantusIs that 450 as in 4.5 V? That doesn't seem right.13:23
MaxdamantusNo, because -bf is 550.13:23
KotCzarnynah13:24
KotCzarnyits not the voltage13:24
KotCzarnyjust raw values13:24
KotCzarnyand because retu is undocumented you can only guess13:24
MaxdamantusBut if it's an ADC connected to the battery, it should universally correspond to a particular voltage.13:25
KotCzarnybut you dont know what that register reports13:25
KotCzarnymight be scaled value13:25
KotCzarnyand as i've mentioned in the post, graphs can shed some light what those values mean13:26
KotCzarnysee the plots13:26
MaxdamantusBut presumably it will still return a particular value for a particular voltage, so someone just needs to figure out the corresponding values, which you can do by attaching a multimeter in parallel with the battery, or just providing a controllable constant volage power source.13:26
KotCzarnyhttps://mrrau.eu:20281/n800/kcbatt/batt2gp-0.png13:26
KotCzarnythe others are from different runs13:27
KotCzarnyhttps://mrrau.eu:20281/n800/kcbatt/batt2gp.png this seems quite long run13:27
KotCzarnylegend in the middle13:28
KotCzarnyfunny that light sensor reports temperature too13:29
KotCzarnyyou can see that 400 should correspond roughly to 3.6V13:30
KotCzarnyassuming you kno the li-ion discharge curve13:30
KotCzarnymaybe even 45013:31

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