Amazon.com: BestTong 18650 Battery Case Holder, 2 Slots 3.7V DIY Battery Storage Box in Parallel or Series Plastic Batteries Case with Clips Pins Contacts for Soldering 2 x 18650 Pack of 2 : Electronics
4-Way 18650 Battery Holder - DFRobot
18650 Battery Case Holder 2 Slots Wired Battery Storage Box with ON OFF Switch;18650 Battery Case Holder 2 Slots Wired Battery Storage Box - Walmart.com
2S 18650 Battery Holder Case Box with 6" Wire Leads for 2X 18650 (8V) Li-Ion Batteries by Envistia Mall
18650 Lithium Battery Charger Mobile Power Box 6*18650 Battery Box 4*18650 Battery Pack USB 5V DC 8.4 V/12.4 V 6 Slot / 4 Slot|Replacement Parts & Accessories| - AliExpress
1047 - Keystone - Battery Holder, 18650 x 2, PCB
Battery holder: Li-Ion 18650 Battery Holder (1S4P) With 2.6" long 20AWG & PCB (1S4P-18650)
18650 Battery Holders - Keystone | Mouser
Series Battery Holder for Two 18650 Lithium Batteries