Lithium Ion Battery - 18650 Cell (2600mAh, Solder Tab) - PRT-13189 - SparkFun Electronics

Battery Holder - 2x18650 (wire leads) - PRT-12900 - SparkFun Electronics

18650 3.6 V Lithium-Ion Battery Rechargeable (Secondary) 3.5Ah

USE-18650-3500PCB

3000mAh 18650 Batteries

2600mAh high capacity battery for high lumens flashlight, Fits for most flashlights, toys, doorbells, headlamps and so on, 1500+ recharge cycles

UltraFire 2600mAh 3.7V 18650 Rechargeable BRC Lithium Battery With Protection Board (2PCS)

Tenergy PCB Protected Rechargeable Li-Ion Battery Module with Bare Leads, 3.7 V, 2600 mAh

Tutorial: Soldering Li-Ion Battery Cells (18650, 18500 21600) - Oscar Liang

Battery Holder - 18650 (PTH) - PRT-13113 - SparkFun Electronics

18650 3.7 V Lithium-Ion Battery Rechargeable (Secondary) 3.4Ah

UL1865-34-1P

18650 Li-ion Batteries With Solder Tabs: Electronics

2s1p 7.4V 2200mAh 2600mAh Icr18650 Li-ion Battery Pack with PCM and Wire - China Battery, Lithium Battery

AES Spy Cameras 11.1V 2600mAh 3 Cell Lithium Ion 18650 28.86Wh Rechange Battery Pack with 2 Pin MTA-100 Connectors