nPM1300 Power Profiling Overcharge

[Jayant Tang]

Hello DevZone,

I'm testing the nPM1300 with the battery inside the Thingy:52, which has rated capacity 1440mAh and rated voltage 3.7V.

The charge current is 800mA.

I set the V_TERM = 4.2V, V_CUTOFF = 3.0V, and capacity 1440mAh.

After 2 days battery profiling at room temperature, the result shows that the capacity is about 1550mAh. And I feel that there is very slight expansion of the battery.

Is this phenomenon normal? Or did I do anything wrong during the battery profiling?

Attached is the profiling data.

Thingy52.7z

Best regards,

Jayant

[ketiljo]

The rated capacity of a battery is normally the minimum capacity guaranteed by the manufacturer. The actual capacity is always higher than this, 5-10% is typical.

I checked this and the profiling has finished successfully. We have tested the very same battery few months ago and it measures around the same capacity. Nothing to worry here. 

This will not affect the fuel gauge performance since algorithm follows the open circuit voltage curve of the battery.