ORIGINAL: billd76
I just picked up a JR 2300 Mah MiMh. put it on my oynx 230 charger set as factory charge defaults for a 2300 MiMh. within about 20 minutes it was complete and it was very warm to the touch. Are you saying I could've potentially killed it?
If you let your battery get very warm from charging, you won't necessarily "kill it" right away unless you used really outrageous settings (charging a 2300 NiMH at 10 or 15 amps, for instance). Even that wouldn't necessarily ruin a battery completely.
Quick charging and getting the battery very warm breaks down the compounds that make up the battery's chemical components more quickly. It will "age" the battery prematurely and the battery will need to be replaced a year or two earlier than it might have been if slow charging and only occassional quick charging had been done to it.