Type: ER261020 Lithium Battery, (Non-rechargeable battery); 10 Year Shelf Life Nominal Capacity: 16000mAh. Voltage: 3.6Volt; Battery Height: 4 inch; Diameter:1.05 inch Superior operation in low and high temperature environments( -67℉ to +185 ℉). Work for digitrak sonde memory and standby power, automotive electronics, horizontal drilling transmitters, intelligent instrument and meter, alarms and security devices, marine sounding equipment, mine exploration equipment,alarm and safety equipment etc. Warm Tips: Please check carefully if the ER261020 battery is the size you need for your electronic device before purchasing. ER261020