Additional Battery Packs extend total foot warming duration throughout extremely cold days.
WARNING: The Therm-ic Li-ion Remote Blue Battery Packs can only be recharged by the Li-ion Global Charger for Blue Battery Packs. Charging with any other charger will damage these batteries. If you need a Li-ion Global Charger for the "WHITE" Battery Packs, click here.
If you need a Global Charger for NON-Li-ion Therm-ic batteries, click here.