Amazon.com: funkawa (3- Pack) Shockli 18500 1600mAh Rechargeable 3.7V Solar Batteries[ for Landscape Spotlights, Solar Light ] -Button top : Health & Household
Amazon.com: 18500 Rechargeable Batteries 4 Pack with Charger, JESSPOW IMR 18500 Rechargeable Li-ion Battery 1600mAh 3.7V [ for Flashlight, Solar Garden Light ] with Flat Top : Health & Household
18500 battery 1300 mAh Tested 3.75V +/-0.2v, Lot of 4 Pieces | eBay