Lake Lite's batteries are all high-grade Solar rechargeable batteries. Our batteries provide high energy densities meaning our batteries are filled to capacity with power, unlike store brands. Under normal conditions, our Solar Rechargeable Batteries will last 2-4 years! We provide replacement batteries for all of our products to maximize solar light performance. On our website, you will find replacment batteries for all of our products including Solar Deck Light batteries, Solar Post Cap batteries, Solar Dock Dot batteries, the Solar Rail Light battery, the Solar Piling Light battery, plus many, many more!