We have an outdoor device that includes two LEDs powered by a battery.
We are currently using a 1650 ma lithium Polymer battery but are considering
switching to battery that handles cold temperatures better (lithium Thionyl Chloride)
Space is at a premium in our device so we require a small form factor
battery (space available is approx 12mm X 55mm X 65mm)
The battery has more than enough capacity to power the LEDs and we would like
explore the possibility of using some of that energy to power a heating foil
to keep the device temperature (device is in a sealed plastic housing) from falling below
freezing so that the battery operates and charges at its optimum.
If its not already obvious...I am a complete NON-ENGINEER
Can someone point me in the general direction of which type of heating
technology would be feasible?