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Using 4x Panasonic 3400mAh cells makes this powerbank very powerful and can fully charge my SG S6 3.8 times. You can charge powerbank while charging your phone from it. You can basically use it as UPS for your small USB device like Raspberry Pi or other USB powered devices. Cells are charged up to 4.18V which is best balance between capacity and charging cycle wear. they are not overvoltage I Highly recommend and I already bought 4 of them and will buy another.
Verified purchase: Yes | Condition: New
Very good works great this is my second one. The first is still working just needed it on the other side of the house....
Verified purchase: Yes | Condition: New
It works perfectly, except it quickly looses charge over time . I carry it all the time in my bag and after a month, maybe less then a month it discharges itself for about 30 %. In the same time i have a Xiaomi 5000 MAh battery backup also and in the same time it looses just 1-2 % of charge.
Verified purchase: No
I like it very much !!!
Verified purchase: Yes | Condition: New