|
Trevor - How cold is it getting where you are? Even in Cooma it only gets to -10 or 11C. How old are your batteries?
Lithium ion cells (wet electrolyte type rather than dry) are designed to work reliably to -20C or so. Below this the increased impedance of the electrolyte affects the rate capability. These batteries should even work at temps down to -30C, and while they may slow to a trickle you won't damage them. They don't lose charge, as such, but their ability to supply their stored energy is compromised at lower temps.
Unless you go with a battery grip that holds a couple of cells in parallel (may work for you as it does me) then you are probably best advised to go with the direct DC source as mentioned.
|