King Kong ICR 26650 3.7V 4200mAh Li-on Unprotected Battery In stock

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HKJ has reviewed the KingKong 4000MaH:

https://budgetlightforum.com/t/-/11991

https://budgetlightforum.com/t/-/11410

More:
Keeppower 26650: https://budgetlightforum.com/t/-/10537

Trustfire 26650: https://budgetlightforum.com/t/-/8149

etc.