Originally Posted by
Tourist in MSN
I assume you will not be touring in sub freezing temperatures, if so you should not charge Li Ion batteries in sub freezing conditions.
In my Bike Energy Harvester, I use Nitecore NL1835LTHP Low-Temperature 18650s. My own circuit, built years ago, has relied on LiFePO4 batteries, which have superior low-temperature performance compared to lithium-ion batteries and reliably operate down to -20C.