Jul 20, 2010
I have looked all over the internet for an answer for this, with no luck. I have an ASUS TF300T Transformer tablet. I want to be able to carry one charger when I travel to use for both my tablet and phone. The ASUS charger has two ratings on it, 5V @ 2.1a and 15V @ 1.5a. I know that devices pull necessary amps, and a higher amp rating will not damage a device, but could allow faster charging. the voltage on the other had, could be a problem.

My question is, what determines if the charger is running 15v @ 1.5a vs. 5v @ 2.1a? I don't want to plug in my Droid RAZR HD and have the charger kick it's butt with 15v.
That is a good question. I'm not too familiar with electrical stuff, but I can try and help till someone with more knowledge jumps in. What is the rating on the charger for your phone?