Battery capacity: 350mAh Voltage limit: 4.47V Compatible with: EB-BR860ABY For Samsung Galaxy Watch4 40mm EB-BR870ABY For Samsung Galaxy Watch4 44mm EB-BR880ABY For Samsung Galaxy Watch4 Classic 42mm EB-BR890ABY For Samsung Galaxy Watch4 Classic 46mm Battery Country of Origin: China Packing specification: bulk package (bubble envelope bag) Important: New Lithium Ion batteries must be FULLY CHARGED and FULLY DISCHARGED 2 to 3 times, before being FULLY CONDITIONED. Please remember that a new Lithium-Ion battery's full performance and longevity is only achieved after 2 to 3 complete charge and discharge cycles. After you go through 2 to 3 cycles, you'll never have to condition your battery again! All talk and standby times are approximate, depending upon carrier's network settings, signal strength, and features selected. Talk and Standby times will be lower in Analog mode as noted above. Dear customers and friend: when you buy my product,if anything unusual happens:Not received the items, or inconsistent with the description, or other reasons make you not satisfied. Please do not leave neutral (or negative )feedback or open case easily, please feel free to write to contact me. We will do our best service to solve your problem. I believe that good communication can resolve everything. We appreciate your understanding and patience. We will ship your items as soon as possible after you made payment. If your items ran out of stock or any other problems. We will tell you as soon as possible. Normally, we ship it by Hong Kong Airmail, Singapore Airmail. The International Shipping requires more complicated shipping procedures. If item not arrive after expectation day or any other question. Please don't hesitate to contact us. We will do our best to resolve the problem.