Great fit for Defend Security Camera: This rechargeable lithium battery is fully compatible with Tactacam defend solar panel cellular security camera Sustainable Power Solution: Rechargeable battery pack includes 2 lithium-Ion batteries, eliminating the need for frequent AA battery replacements Long-Lasting Power: Designed to enhance your Defend cellular security system, this rechargeable battery delivers impressive longevity and consistent performance. The battery easily lasts several weeks on a single charge, even with frequent camera activity, reducing the hassle of constant recharging Easier to keep your camera charged: This lithium battery pack ensures extended usage time for your hunting cameras, This makes keeping a stash of batteries around for my camera unnecessary, reducing the need for frequent battery changes Save Batteries: You slide this in and it replaces batteries, Much more convenient to use than replacing 'AA' batteries. A must have if you do not want to change out batteries all the time