no offense but you clearly haven't used the official charger before then. yours is kicking out 5V 500mA and the official charger gives out 9v 1.67A. I'm no electrician but I would say that's more. A lot more. I used one similar to yours and it blew. Hard. So he really didn't save $2 he saved 1/2 or 2/3 charging time and gained the ability to actually charge it and use it at the same time instead of trying to maintain it while using it.
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