ccapublic 1 Posted October 5, 2018 Share Posted October 5, 2018 Hi All, I did my best to sort the following issues out by searching the web / forum with no success. Please forgive me in advance if topic was already covered. I have a cubietruck running mainline kernel and have installed a LiPo battery. I can get info about the battery by catting /sys/class/power_supply/axp20x-battery contents. However, some things are weird ; - capacity reports 0 (but bat is charged) - voltage_now reports 4.5V (abnormal for a LiPo) while voltage_max says 4.2V (which is normal) - status says discharging even when on mains - ssh motd does not show battery status (btw 30-armbian-sysinfo seems to point non existing folders both for mainline_dir and legacy_dir). Any comment whether this is normal or not and if not how to fix it ? Thanks a lot for your support Cyril Link to post Share on other sites More sharing options...
ccapublic 1 Posted October 6, 2018 Author Share Posted October 6, 2018 Some more info : - Running kernel 4.14.70-sunxi - LiPo battery voltage measured with a multimeter is 4.5V-4.8V depending on load. There is *really* a problem here Link to post Share on other sites More sharing options...
chrisf 25 Posted October 6, 2018 Share Posted October 6, 2018 If I were you I'd measure the battery with a multimeter. If it really is above 4.2v it is a fire risk. If the board has calibration issues, that's not so bad. Link to post Share on other sites More sharing options...
ccapublic 1 Posted October 7, 2018 Author Share Posted October 7, 2018 Hi. That's what I did and battery has really a too high voltage. So it's either a pmu hw issue (I doubt it) or os/sw issue, but I don't know where to start to try to fix it Do you really think the risk is real here ? Thanks Link to post Share on other sites More sharing options...
chrisf 25 Posted October 8, 2018 Share Posted October 8, 2018 The risk of fire for unprotected cells is tall of you over charge them. They catch on fire when there is an internal short circuit. Over charging is one way to break down the insulation inside. Link to post Share on other sites More sharing options...
ccapublic 1 Posted October 8, 2018 Author Share Posted October 8, 2018 Thanks chrisf. I Will disconnect the battery ASAP. Do you know where this problem can come from ? Configuration ? (Sorry I'm a beginner with armbian & linux in general) Link to post Share on other sites More sharing options...
ccapublic 1 Posted October 9, 2018 Author Share Posted October 9, 2018 Ended up installing i2c-tools and dumping axp209 registers. PMU setup/status as reported by driver match i2c registers... There must be something wrong with the HW as my LiPo IS 4.5-4.8V in spite of correct config... Confused me... Link to post Share on other sites More sharing options...
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