ShtokCustomWorx - Protected Keeppower batteries fit very well in Polarized ( Keystone 1042P model) 18650 holders, it has a leaf (springy) contact for Negative battery terminal and pin contact for Positive battery terminal.
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Amazon.com: Keystone 1048 (PACK OF 2) Dual Battery Holder, “18650” LITHIUM-ION BATTERY HOLDERS, : Electronics
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China Equivalent of Keystone 1042 Li-ion Single SMT 18650 Battery Holder - China Battery Holder, 18650 Battery Holder
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Factory Customized Metal Keystone 18650 Leaf Plate Spring Steel Battery Contact Spring - Buy Spring Electrical Contacts,18650 Battery Contact,Metal Battery Contact Product on Alibaba.com
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