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Originally Posted by PoFF
I think this info is still right and up to date. My last experience (real, direct experience) was with a 9.6V battery made of Sanyo "Twicell" Ni-MH cells, not too old of a technology if you ask me. The battery was properly and fully charged with an Apex peak detection charger, which in theory, should charge properly, isn't it? Well, niet, zero, nada, no shot, the voltage was simply not high enough to wind the spring.
If you look on Sanyo website, it's written in each cell description that a Cadnica Ni-Cd have a discharge operation range from -20 to 60 degrees, while a Twicell Ni-MH from 0 to 50 degrees, a 20 degrees difference
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My experience has been with Intellect and GP cells, which I've observed to be far superior to Sanyo cells. My 3700mAh GP NiMH battery was one of the ONLY batteries still going at the end of a game in around -15 degree weather. It showed no sign of performance degradation due to the weather, unlike some of the other NiCad batteries that were still working.