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
uxcell 2Meters 85mm Width PVC Heat Shrink Wrap Tube Blue for 18650 Battery Pack: Amazon.com: Industrial & Scientific
Eve ICR18650-26V - 3.6v, 2.55Ah, 7.65A 18650 Cells (blue wrap) – Battery Clearing House