Whats the most voltage the S2 can take to charge?

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Hi Guys,

Whats the most voltage the S2 can take to charge?
Looking on google I found a lot of people asking about a problem of having a too high voltage pausing charging. I want to know whats the quickest way to charge the S2...

5V is the official output of the S2 charger, I wouldn't go any higher or you'll risk damage. mAh (A) is not so much a problem, too low and it'll take longer to charge, too high and it will only draw what it needs, as long as it's 5V

Sent from my GT-I9100 using XDA

Thanks, the cheap charger I have and usb chargers go at about 3,9v....