bq2415x_charger.c: battery is discharged (fast, 224mA) when it should be charged

Pavel Machek
2015-02-01T09:47:02Z

Hi!

I connected N900 with full battery using USB. For some reason, charge
limit was set to 100mA, battery was "full" and was discharging:

root@n900:/my/tui/ofone# ./tefone
Ready.
Battery 4.017 V 4.039 V 81 % 0 % 0 / 0 / 2056 mAh Full -242.224 / 550 / 100 mA

I adjusted the current limit, but got no change, battery is still
discharging, fast:

root@n900:/my/tui/ofone# echo 500 > /sys/class/power_supply/bq24150a-0/current_limit
root@n900:/my/tui/ofone# ./tefone
Ready.
Battery 3.994 V 4.034 V 78 % 0 % 0 / 0 / 2056 mAh Full -251.506 / 550 / 500 mA
Battery 4.0 V 4.037 V 79 % 0 % 0 / 0 / 2056 mAh Full -223.125 / 550 / 500 mA
Battery 4.005 V 4.037 V 79 % 0 % 0 / 0 / 2056 mAh Full -224.91 / 550 / 500 mA
Battery 3.994 V 4.037 V 78 % 0 % 0 / 0 / 2056 mAh Full -224.91 / 550 / 500 mA
Battery 4.023 V 4.037 V 81 % 0 % 0 / 0 / 2056 mAh Full -224.91 / 550 / 500 mA
Battery 4.011 V 4.037 V 80 % 0 % 0 / 0 / 2056 mAh Full -224.91 / 550 / 500 mA
Battery 3.994 V 4.031 V 78 % 0 % 0 / 0 / 2056 mAh Full -256.504 / 550 / 500 mA
Battery 3.994 V 4.029 V 78 % 0 % 0 / 0 / 2056 mAh Full -224.017 / 550 / 500 mA
Battery 3.988 V 4.029 V 77 % 0 % 0 / 0 / 2056 mAh Full -224.731 / 550 / 500 mA
Battery 4.005 V 4.023 V 79 % 0 % 0 / 0 / 2056 mAh Full -223.66 / 550 / 500 mA

I'm getting a lot of

[ 208.037719] bq27x00-battery 2-0055: battery is not calibrated! ignoring capacity values
[ 238.038024] bq27x00-battery 2-0055: battery is not calibrated! ignoring capacity values

messages, that's why all the 0s in battery information dump.

Any ideas?

Thanks,