using a different charger

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http://forums.androidcentral.com – so i recall that there was some discussion on this a while back, but i cannot seem to locate the thread that gave a definitive answer, so i wanted to pose the question again and i hope someone can assist: i have an HTC charger from my old EVO, either the 4GLTE or the 3D and i used to use it as my travel charger. i was wondering if it would be a bad idea to charge the One with it, knowing that the charge speed is different. will i damage the battery using the old charger? thanks for the help. (HowTos)