Ooma Telo Handset Cordless Phone Combo-Pack Includes: 4 x SDCP-H304 Batteries (4) Pack Replacement Batteries for OOMA HB1001 - Ni-MH, Volt, 700 mAh. These Batteries are fully Compatible with the original battery You can rest assured that these batteries will work with your Cordless Phone, And it will charge in your Phone. We use only high quality Japanese cells, so you are sure these batteries will last for years to come. Synergy Digital is a very high reputable company that manufactures and distributes batteries and other electronic accessories for over 2 decades, this product comes with a 1 year manufacturer warranty.