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3.7 v li ion battery 1800mah, Amazon.com: 3.7V 1800mAh 804050 Lipo Battery Rechargeable Lithium Polymer ion Battery Pack with PH2.0mm Connector(Actual is 2000mAh.) : Health Household, Amazon.com: 3.7V 1800mAh 804050 Lipo Battery Rechargeable Lithium Polymer ion Battery Pack with PH2.0mm Connector(Actual is 2000mAh.) : Health Household