(No idea if that's a good one or a crappy one - just an example of the category you should be looking for)
Even if both chargers are in use at the "same time", one cell phone will finish charging before the other does - and you'll probably wind up with one of them seeing 20V and the other 4V and fry something.
I have a couple of these step down converters i got from AliExpress and they seem to work fine. one is 24v to 19v for my TV and laptop and one 24v to 12v for my router. Seem to work fine and US$10 with free shipping. (to NZ anyway)
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