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

Pavel Machek
2015-02-01T20:56:03Z

On Sun 2015-02-01 10:47:02, Pavel Machek wrote:
> 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?

Reset kicked the charger back into the charging mode:

root@n900:/sys/class/power_supply/bq24150a-0# echo reset > mode
root@n900:/sys/class/power_supply/bq24150a-0# cat mode
auto (host)
root@n900:/sys/class/power_supply/bq24150a-0#

Battery 4.017 V 4.037 V 81 % 0 % 0 / 0 / 2056 mAh Charging -109.42 / 650 / 500 mA
Battery 4.017 V 4.039 V 81 % 0 % 0 / 0 / 2056 mAh Charging -103.173 / 650 / 500 mA

...and discharge current reduced. I tried adjusting current limit, but
it still discharges at 100mA (with screen on).

USB extension cable was probably part of a problem. It works better
with n900 plugged in directly into the PC.

(But it still will not terminate the charge:

Battery 4.158 V 4.177 V 95 % 0 % 0 / 0 / 2056 mAh Charging 13.03 / 650 / 500 mA
Battery 4.164 V 4.177 V 96 % 0 % 0 / 0 / 2056 mAh Charging 13.03 / 650 / 500 mA
Battery 4.164 V 4.177 V 96 % 0 % 0 / 0 / 2056 mAh Charging 10.888 / 650 / 500 mA
Battery 4.164 V 4.177 V 96 % 0 % 0 / 0 / 2056 mAh Charging 1.249 / 650 / 500 mA
Battery 4.164 V 4.177 V 96 % 0 % 0 / 0 / 2056 mAh Charging 10.353 / 650 / 500 mA
Battery 4.158 V 4.177 V 95 % 0 % 0 / 0 / 2056 mAh Charging 9.639 / 650 / 500 mA
Battery 4.164 V 4.177 V 96 % 0 % 0 / 0 / 2056 mAh Charging 10.71 / 650 / 500 mA
Battery 4.164 V 4.177 V 96 % 0 % 0 / 0 / 2056 mAh Charging 7.497 / 650 / 500 mA
Battery 4.158 V 4.177 V 95 % 0 % 0 / 0 / 2056 mAh Charging 9.639 / 650 / 500 mA
Battery 4.164 V 4.177 V 96 % 0 % 0 / 0 / 2056 mAh Charging 6.247 / 650 / 500 mA
Battery 4.164 V 4.177 V 96 % 0 % 0 / 0 / 2056 mAh Charging 5.533 / 650 / 500 mA
Battery 4.164 V 4.177 V 96 % 0 % 0 / 0 / 2056 mAh Charging 4.284 / 650 / 500 mA
Battery 4.164 V 4.177 V 96 % 0 % 0 / 0 / 2056 mAh Charging 4.284 / 650 / 500 mA
Battery 4.164 V 4.177 V 96 % 0 % 0 / 0 / 2056 mAh Charging 3.927 / 650 / 500 mA
)