Battery Case Storage Box 2 Slots x 3.7V 2-Wire Lead for 2 x 18650 Battery 2Pcs - Walmart.com
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