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Amazon.com: DC 3.7V 2100mAh 804050 li-ion Lithium Ion Polymer Battery Replacement for DIY 3.7-5V Electronic Product, Mobile Energy Storage Power Supply : Electronics
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Rechargeable 3.7V 2200mAh Lithium ion battery 3.7V Li ion cells for 11.1V 12V 24V Singing machine mobile DVD player|Rechargeable Batteries| - AliExpress
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