The ER3 battery features high voltage (3.6V) and smooth discharge characteristics, and the resistance changes very little during discharge and can be used over a very wide temperature range (-55°C to +85°C), often Used in smart meters, electricity meters and various electronic devices.
Maxell ER3 lithium battery can be used in Smart meter
Maxell ER3 lithium battery can be used in Electric meter
Maxell ER3 lithium battery can be used in GPS System