Battery wont charge

[mauricio]

I have an olinuxino A64, rev. G (two of them), I'm running tests on it, with an attached lipo battery, trying to implement a gracefull shutdown when no main DC current is detected.

uname -r
5.10.180-olimex

cat /etc/os-release | grep PRETTY_NAME
PRETTY_NAME="Debian GNU/Linux 12 (bookworm)"

For that, I started to look at /sys/class/power_supply/ files.

=== BATTERY SYSTEM ===
capacity: 47
constant_charge_current: 1000000
constant_charge_current_max: 1200000
current_now: 2000
health: Good
online: 1
present: 1
status: Charging
type: Battery
uevent: POWER_SUPPLY_NAME=axp20x-battery
POWER_SUPPLY_TYPE=Battery
POWER_SUPPLY_PRESENT=1
POWER_SUPPLY_ONLINE=1
POWER_SUPPLY_STATUS=Charging
POWER_SUPPLY_VOLTAGE_NOW=3806000
POWER_SUPPLY_CURRENT_NOW=2000
POWER_SUPPLY_CONSTANT_CHARGE_CURRENT=1000000
POWER_SUPPLY_CONSTANT_CHARGE_CURRENT_MAX=1200000
POWER_SUPPLY_HEALTH=Good
POWER_SUPPLY_VOLTAGE_MAX_DESIGN=4200000
POWER_SUPPLY_VOLTAGE_MIN_DESIGN=2900000
POWER_SUPPLY_CAPACITY=47
voltage_max_design: 4200000
voltage_min_design: 2900000
voltage_now: 3806000

=== AC PLUG SYSTEM ===
health: Good
input_current_limit: 1500000
online: 1
present: 1
type: Mains
uevent: POWER_SUPPLY_NAME=axp813-ac
POWER_SUPPLY_TYPE=Mains
POWER_SUPPLY_HEALTH=Good
POWER_SUPPLY_PRESENT=1
POWER_SUPPLY_ONLINE=1
POWER_SUPPLY_VOLTAGE_MIN=4000000
POWER_SUPPLY_INPUT_CURRENT_LIMIT=1500000
voltage_min: 4000000

My problem is that batteries wont charge on A64 (just tryed one of them, because the other one is far from me), but they charge very well on an olinuxino micro A20.

I'm wondering if this just happening just to me or is an A64, rev. G software/hardware/OS situation.

Also, as aditional info, I'm powering the A64 from an adjustable power source, I can see voltages and current given by it, it's giving 5.2V and ~330mA, even when the limit set to the power source is 2Amps.

This last battery I tried, has two hours stucked in these values (also the adjustable power source)

Tue Jun 23 14:00:38 -04 2026
Status: Charging
Capacity (%): 47
Current (uA): 2000 (<---this value only changes between 1000 and 2000)
Voltage (uV): 3806000

If I unplug the power barrel jack, the values change to this

Tue Jun 23 14:02:34 -04 2026
Status: Discharging
Capacity (%): 47
Current (uA): -478000
Voltage (uV): 3687000


Please also note, that the first battery I tryed, at A64, get stucked at 66% charge, like this

Charging
66
1000 (<---this value only changes between 1000 and 2000)
3896000

At the A20, this battery, after two hours of charge says

14:16:15
99
4176000
124000

So I need to ask:

Do I need to do some extra stuff to get the battery to charge ?

Is this normal behavior ? May I suspect a fail PMIC ?

What may I do to improve the charge ?

Please let me know, thanks