All you need to know about the 3.7V lithium ion battery-Tycorun Batteries
18650 Blue Lithium-Ion Rechargeable Battery - 3.7V 2600mAh | xUmp
Adafruit Industries Lithium Ion Polymer Battery - 3.7v 2500mAh - Micro Center
Li-ion battery 5000mAh 3.7V
715263 3.7v 3500mah 705068 Lithium Polymer Battery 2800mah 605065 With Board For RG35XX Pda Tablet Pcs Digital Products
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
Amazon.com: AKZYTUE 3.7V 700mAh 603035 Lipo Battery Rechargeable Lithium Polymer ion Battery Pack with PH2.0mm JST Connector : Health & Household
3.7V Rechargeable Lithium ion Battery LP18650A+ 3500mAh With PCM and JST XHP-2 Connector