10pcs Hold 2 Li-ion 18650 Battery Holder 3.7V Parallel Case With 2 Wire Leads | eBay
Amazon.com: 18650 Battery Case Holder, 3 Pcs 4 Slots x 3.7V 14.8 Volt DIY Battery Storage Box, in Parallel Black Plastic Batteries Case for 4 x 18650 Ltvystore : Electronics