Difference between Battery current and IO current

[plafond75]

Hi,

I'm trying to understand the difference between the IO current, and the battery current.
I have a RPi 3B+ that consumes 410 mA when in idle (measured with an amp meter)

I have then plugged the pijuice module, with the BP7X battery.

When not in charge, I can read :

• from the pijuice_cli : GPIO power input : 5.062V, 1.52A (actually oscillates between 1.3 and 1.8A)
• from the python API : pj.status.GetBatteryCurrent() = 486 mA

When in charge :

• The power source (read via amp meter) gives 1.42A
• from the pijuice_cli : GPIO power input : 5.062V, 1.49A (actually oscillates between 1.3 and 1.9A)
• from the python API : pj.status.GetBatteryCurrent() = -487 mA

If, when not in charge, battery current indicates 486 mA (which is roughly what the RPi consumes), why does IO current indicates ~1.5A ?

Thanks in advance :-)

PS : Firmware and software are up to date (1.6 & 1.8)