Batteries at freezing temperatures

[alexwryt]

I am trying to develop a battery operated invention that will be used primarily in sub freezing conditions. From what I can tell from my research so far, a simple 9 volt NiMH or lithium will work fine under these conditions. The only problem I foresee though is that when this was eventually a product out on the market, I doubt the general public as a whole would heed the package warning of only using NiMH or lithium batteries

As a workaround I've thought of integrating a rechargeable battery into the product itself but am unsure what type of battery would be ideal and also cheap. (Basically I'd like to be able to turn a DC motor with a small load for at least 2 hours)

 

[0xDEADBEEF]

NiCd work down to -40°C whereas NiMH, lead acid, LiO stop working at -20°C. NiCd can be recharged, but seems to become illegal now in the EU. Lithium stuff is expensive, but appearently can be made to work in the cold too.

 

[ravioli]

You can always purchase the batteries that you feel would fit best in your device from an OEM. From there, put your companies name on it and add a little premium. Then, only support your device with those said batteries (but of course let your battery chemistry be known)...