Test / Review: Efest IMR10440 V1 350mAh (Black)

I am only below 2 volt for about 2 seconds and then at a high load. The batteries are not discharger below 2 volt.

No, you will damage the batteries if you run them below 2 volt and probably also below 2.5 volt.

200mA is good.

Does the bt-c3100 do pulse charging?

I don’t like pulse personally.

Xstar MC-0 does ok at 250 mA but it’s not too hard to mod a tp4056 board to even lower charge current.