?Wide Compatibility? Our cordless tool battery packs is widely compatible with all kinds of home power tool, such as, electric lawn mower, weed blower, electric pruning shears, electric chain saw, and so on. ?High Capacity?We have different capacity batteries for you to choose from, suitable for different types of power tools. High capacity batteries allow you to get rid of power tool range anxiety and make your work more efficient. ?Specifications: A: 12V 1500mAh Battery; B: 21V 1500mAh Battery; C: 21V 3000mAh Battery ?Premium Material & Long Battery Life?Made of premium ABS and metal material, rechargeable battery is sturdy and wear resistant. Replacement battery compatible with power tool offer a long-lasting performance, extended the battery life, longer run time than other batteries. ?Battery Protections & User-friendly?Made with high quality battery cells,Built-in protection against overcharge, overdischarge, overcurrent provides short circuit protection and constant voltage circuit. Lightweight battery; Easy to install and remove; Charge at any time when you need ?Replacement Battery ?The auxiliary battery allows you to no need to worry about the lack of power when the weed eater is working, which can keep you working efficiently without waiting for charging.