Kodai 18650 to 21700 Battery Adapter Sleeves, 4 Pack [Battery-Free]

The Kodai 18650 adapter sleeve provides a physical fit between a flat-top 18650 battery and a compatible 21700-size holder. Use it only with devices that support this cell-and-adapter arrangement.

Each set contains four semi-transparent sleeves with nickel-plated manganese steel contacts. The sleeve surrounds the cell and connects it to the holder without changing the battery chemistry, capacity or electrical ratings.

This is a four-piece adapter set. Batteries and the main device are not included. Match the cell type, holder dimensions and device requirements before fitting the sleeve, since a size adapter does not establish electrical compatibility on its own.