For use with Cole & Bright lighting products. Do not mix with different types of batteries or primary batteries. Make sure to insert correctly and dispose of them according to local regulations. Ni-MH stands for Nickel metal hydride battery. When first installed, the batteries may take a week to fully charge. Recharge batteries in a compatible charger every 6 months to prolong their life and maintain the run time of your solar lights. Replace batteries in your solar lights every 1 – 2 years.