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You can use any micro USB charger (5v).
I use various ones and have a 2amp charger from my local office supply store that works great.
HTC has a rapid charger as well, I believe.
Answered by Stew2 5 years ago
Yes a rapid charger kit is available for the HTC One (M9) Cell Phone.
Answered by CommunityAnswer 5 years ago
I've heard you can, but haven't found one yet.
Answered by TLMart 5 years ago