The Kastar battery pack replaces shaver batteries that use two 1.2V AA NiCd batteries (2.4V total) with 1000mAh or lower capacity. Please verify your shaver uses AA size batteries, 2.4V, and NiCd/NiMH chemistry before purchasing. Not compatible with AAA battery devices. Built with high-capacity 2000mAh NiMH rechargeable cells, providing longer runtime and improved performance compared to older 600mAh or 700mAh NiCd battery packs. AA size battery pack with solder tabs. Designed for shaver models that require solder installation. This is NOT a standard removable AA battery. Compatible with many Norelco and Remington electric shavers and toothbrush models. Please check the compatible model list in the product description before purchasing. Includes 30-Day Money Back Guarantee and 18-Month Manufacturer Warranty for reliable performance and replacement support.