Originally Posted by Iride01

SM-BCR2 is what I also use. But you have to know what the output voltage and amperage is for the thing you plug it into. Somewhere on that power strip it tells you that. Sometimes like ISO/ETRTO sizes on a bicycle tire, it's in the tiniest print embossed on that device.

Older power strips might have only used a .5 amp output for the USB. Newer ones probably are using more. You need to know. More output amperage won't hurt anything. I use my phones turbo charger which is 5vdc 3 amps output.

The SM-BCR2 like my smartphone, has the smarts built into it so it knows what rate to charge the battery at.