Amazon.com: MINCHEN 6pcs 18650 Big Plastic Sleeves, Big Plastic Tube Holder for 18650 Battery, Battery Plastic Holder Converter for 18650 Battery to 26650 : Electronics
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Amazon.com: uxcell 18650 Battery Protective Sleeve, 18650 Battery Tube Adapter, 18650 Battery Holder Converter for 26650 LED Flashlight 8 Pcs : Tools & Home Improvement
Battery Extension Tube- Stainless Steel
Freeflight Moto Battery Extension Tube – Fotodiox, Inc. USA