I need to keep batteries in warm place (since lithium works poor at -20C), being connected to my EOS 10D with cable.
Theoretically, the thing I need is a box that accepts AA or BP-111/112 and has Canon AC Adapter-like output.
Can you tell me if such thing exists? I can build it myself from AC adapter, but I'd prefer to buy a unit with a warranty
I know about Quantum Instruments and Digital Pursuits battery packs, but they are heavy, expensive and need to be recharged, and I look for a light device with replaceable power source.