Re: USB port delivers too much power
USB outputs 5V supply up to 500mA (and only 400mA). Rechargeable batteries burn, if not control electronics (on the phone!) Shall have power to regulate.
USB port has no idea what the equipment connected. From mouse pulling micro ampere to 'flat' mp3 players pulling, perhaps, 200mA.
The only USB port to do is restrict the flow to 0.5 A/5V = 2.5 W.
Otherwise, your computer's PSU threatened to burn them.
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