Amazon.com: HXJNLDC DC 3.7V 5000mAh 955565 li-ion Lithium Ion Polymer Battery Replacement for DIY 3.7-5V Electronic Product, Mobile Energy Storage Power Supply : Electronics
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Li-ion Battery LP18650A+ 2P 3.7V 7000mAh 25.9Wh with protection circuit and wires 70mm and JST PHR-2
The difference between lithium ion and lithium polymer batteries - Battery Power Tips
Lithium Ion vs. Lithium Polymer Batteries – Which Is Better? - RAVPower