Ultralast Lithium Ion 18650 3.7 V 2600 Ah Rechargeable Battery UL1865-26-1P 1 pk - Ace Hardware
Amazon.com: 1Pcs 18650 3.7v 4400mAh 1S2P Li ion Rechargeable Battery Pack with 2.0Pin JST-PH Connector 16.28Wh/4.4A, Blue, 6.6 x 1.8 cm (19.28Wh/4.4A) : Health & Household