I think that is correct on all smart devices chargeable by USB, some Ieee standard - it "should be" correct, however I am reluctant to go on record saying it always does because this is exactly the kind of thing that can fry your electronics! Anyway OP, if you have the space needed to put a short USB cable to an external battery pack, and make it stay attached, (big hassle with my Nexus on my car charger), go for it!