4 x 1/2 AA ER14250 Lithium 3.6v Battery Risco Pyronix Yale Orisec Scantronic
4 x 1/2 AA Size (ER14250). Lithium Thionyl Chloride LiSOCI2. After years of using 3.6v 1/2 AA Size batteries these are by far the best in the market. 3.6v Battery. Not 1 has failed. I have used these in Wireless products for over 5yrs.