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Product Name: 18650 Battery Adapter
For: 21700 to 18650 battery adapter
For: Astrolux FT01 / FT02 / FT03
(For Astrolux FT01 / FT02, if you just have 18650 battery can use it.
The FT03 itself can fit the 18650 battery, but it is easier to align the ends of the battery with the spring when use this adapter.)