317 (SR516) Watch Batteries
317 watch batteries are a very small, low-capacity silver oxide button cell, often chosen by watch manufacturers as a low-cost power supply without the disadvantages of alkaline cells. This battery may also be referred to as a 317, SR516SW, SR62, RW326, D317, V317, 28058, SB-AR, or SR516.
Output of a 317 cell is 1.55V, with a typical capacity of around 12mAh. The case of this battery has a diameter of 5.8mm and a height/thickness of 1.6mm.