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.
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Maxell ER3 lithium battery can be used in Smart meter
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Maxell ER3 lithium battery can be used in Electric meter
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Maxell ER3 lithium battery can be used in GPS System