Top positive review
86 people found this helpful
Nice, but watch out for capacity issues
on November 27, 2011
Size and weight exactly like a portable usb harddisk (which is exactly what I am looking for). It is able to quick charge all sorts of devices I can think of, due to built-in "samsung port", which make all usb devices (not just samsung's) think they are connected to a wall charger.
Passthrough Mode: Able to charge usb devices while the battery pack itself is being charged. Nice!
The auto power cutoff works as claimed, but the device being charged must be off, so that full-charge can be detected, (or else the battery pack will continue to supply power, which is correct behaviour).
Every socket tip you would ever need is included from mini or micro usb to weirder types for photo frames or radios. Surprisingly, all accompanying cables are solidly built, including the very useful flexible springy cable. Included international AC wall charger and car charger are compact and light to be portable. The pack's size was more manageable than I had initially thought, as its shape means smartphones can be held/gripped comfortably together while charging on the go.
Generally satisfied. I calculated the capacity-to-weight ratio, and compared with other offerings, and found that it excels.
Update: However, it might have capacity issues. I really wonder whether it does really hold 10000mah, or much less. I think their voltage convertor (from 3.7V LiPo to 5V USB) is inefficient and a lot energy could be loss as heat. This explains why it can charge my 1300mAh smartphone 5 times, my mobile 3G hotspot/mifi 3 times, but can only charge my 4400mah Kindle Fire only once, before running out of juice.
Update 2: Efficiency across all battery packs is 70%. 30% is loss as heat during charging process.