Nope. I had the older version (bought in 2002 or thereabouts) of the propeak charger along with a 1800mah 7.2, some 3300's, 3800 and 4200. All got warm but not too hot to touch. It's a peak charger so senses when the packs are full and reverts to trickle. Old technology but I never had a problem with it.
Lipos are a different kettle of fish, they get charged at 1c or below with my liPo charger.