ACQ 2sx5000 40C pack from hobbypartz
http://www.hobbypartz.com/98p-40c-50...-hardcase.html for $35
I conclude after testing this pack that it will never make it at 40C without melting the cell tabs off. I prefer to get a hardcase pack without the pc board. I'd like the leads directly soldered to the tabs. Consider this a 25C pack with the cells at 140 deg F.