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
3.7V 5000mah (polymer lithium ion battery) Li-ion battery for tablet pc 7 inch 407095 replace High capacity - AliExpress
3-wire Connector 3.7V 2500mAh 803562 Rechargeable Li Polymer Li-ion Battery For Bicycle Dash Cam DVR GPS SIGMA ROX12.0 - AliExpress
18650 Li-ion Rechargeable Battery For MT10, MH10, H8R, P7R | Ledlenser USA
Amazon.com: HXJNLDC DC 3.7V 1300mAh 503759 Rechargeable Lithium Polymer Replacement Battery for DIY 3.7-5V Electronic Product, Mobile Energy Storage Power Supply : Health & Household
18650 Lithium Ion Battery Pack and 3.7V 2000mAh Lithium Ion Cell
PKCELL Flat Top 18650 3.7V 3000mAh Rechargeable Li-Ion Battery
Lithium Ion Polymer Battery - 3.7v 100mAh : ID 1570 : $5.95 : Adafruit Industries, Unique & fun DIY electronics and kits