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Amazon.com: HXJNLDC DC 3.7V 2600mAh 903759 Rechargeable Lithium Polymer Replacement Battery for DIY 3.7-5V Electronic Product, Mobile Energy Storage Power Supply : Electronics
3.7V Battery-3.7v 1500mah 15C Battery with Black SM Plug-18650,Size:67X18X18mm,Weight:37.5g