When you need replacement try batteries try these!
Rechargeable NiMH AA batteries are specifically for solar-powered units. This pack includes 10 piece pack of 600 mAh AA NiCd batteries. Product Description Pack of 10 pieces of "AA" rechargeable NiMH replacement batteries. For use in all solar fixtures.Technical Details
Designed especially for solar lights
Easy to install
Expected Lifetime: 500 charge & discharge cycles. (Appox 2 years in Solar Post Caps)
AA Ni-MH Rechargeable Batteries ensure longer lighting power up to 8hrs of light
Install batteries in the morning and allow them to charge throughout the day.