XTAR SC1 Plus power bank test

Batteries and Chargers Chargers
1

I used a fully charged P45B in the SC1 Plus to charge a Samsung 50S in a DC2BT charger. I set the charging current to 2000 mA, however it was only able to reach ~1450 mA from the USB output. I measured ~2.94V on the drained P45B and ~3.93V on the 50S.

The total output energy was 11793.413 mWh, and the rated energy of the P45B is around 16200 mWh, so with an ~1.5A load the SC1 Plus has a ~72.8% output efficiency. Not too bad if you only have it and a cell in a pinch, but note that the USB output voltage under load was very low at 4.4V.

2

It’s finicky. Mess around with it a bit, take the battery in and out or try different power supplies. I don’t know why it does that it just does

Also this is the boost converter it uses for output voltage

3

Most Li-Ion 5V chargers use linear regulator so 5V input → 3V to 4.2V and excess voltage burned off as heat. I don’t see many chargers use buck regulator.

For powerbank function it has to use boost regulator which should have higher efficiency.