I have found a charger at home.
It was a part of
Logitech MX Performance Mouse kit. I have completely forgotten about it

Anyway, I found it yesterday and it says:
Direct Plug in AC/DC
Input: 100-240 V, 50-60 Hz, 013A
Output: 5.15V, 1A
Quote:
You can recharge your mouse through your computer or a wall socket, even while you're using it, with flexible micro-USB charging
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Obviously I cannot test it because I don't have 650, however, I would like to hear your opinion. What do you think about it? Would it work with 650?