how hot is safe for a nimh pack? i got mine today and charged them on my tritan at 3 amps and they got 105 F. is that temp ok? and how hot can they get without damaging them.

and the first charge on the pack i got a solid 10 min of flight time could have went 1-2 min more. as these packs get broke in will my times increase? im new to all this nimh stuff lol.