How to do a correct test and determine whether a 18650 li-ion is a protected or non-protected battery - Quora
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Review and analysis of XTAR 3600 mAh 18650 Li-Ion protected battery | Rip It Apart - Jason's electronics blog-thingy
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3.7V 18650 Battery 19800mah Lithium Rechargeable Batteries Li-ion Cell Large Capacity Spare Batteria for Flashlight Electric Toy - AliExpress
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