1 2 3 4 x 18650 Serial/Parallel Battery Holders Case Box Connector w/ Wire Leads | eBay
PARALLEL Battery Holder for Four 18650 Lithium Batteries
6xAA battery holder
Amazon.com: 18650 Battery Case Holder, 4 Pcs 2 Slots x 3.7V DIY Battery Storage Box, in Parallel Black Plastic Batteries Case for 2 x 18650 Ltvystore : Electronics
Connecting multiple series battery holder in parallel of 18650 batteries - Electrical Engineering Stack Exchange
Buy 18650 3.7V 2 Battery holder Parallel or Series connector plastic case