The Solar-Breeze uses a rechargeable Lithium Ion battery that has demonstrated a life span of up to 1,000 cycles or more during testing. As a result, the battery should last for up to two years if the Solar-Breeze is used daily and longer if the unit is used only seasonally. This assumes that owners follow proper guidelines for storage and that batteries are not subject to freezing temperatures.Batteries for the Solar-Breeze are covered by the same warranty and replacement policy as the rest of the unit.