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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
Single 18650 Battery Holder | Jaycar Electronics
Amazon.com: Protect Your Power - Slimline 18650 Battery Case, soft durable material - Pack of 2 (Holds 2 Batteries) : Electronics