Battery holder: Li-Ion 18650 Battery Holder (1S4P) With 2.6" long 20AWG & PCB (1S4P-18650)
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Amazon.com: 18650 Battery Case Holder, 5 Pack 3 Slots x 3.7V DIY Battery Storage Box, in Parallel Black Plastic Batteries Case with Pin for Soldering 3 x 18650, by Ltvystore : Electronics
Buy 18650 Battery Holder,10pcs 4×5 18650 Spacer for 4S5P Battery Pack (45 18650 Battery Holder) Online in USA. B07QK4SN2J
Keystone 18650 Battery Holder - For Button Top 18650 Battery – The Saber Armory
BH-351B - Shogyo International Corp. – OEM Electronic Components