Amazon.com: Adeept 2Pcs 2 Slots 18650 Battery Holder Case with Wire and 2.54mm JST Connector, Batteries Connected in Series 7.4V, Solderless Battery Storage Box Holder for DIY Projects : Electronics
Battery holder : Li-Ion 18650 Battery Holder (1S1P) With 2.6" long 20AWG & PCB (1S1P-18650)