These silver oxide 393 button cells are used extensively in calculators, watches, etc due to its stable discharge characteristics. Also known as: SP393, D309, 255, D393/309, GP93, F, V393, SR754W, 10L123, RW48, 15, 546, SR48W, G5, RW28, SB-B3, WL-6, D309/393, V309. Dimension: H - 5.4mm x D - 7.9mm.