Why you need it?
1,Somestimes you can hear or feel the battery rattling or moving in your flashlight,that's so annoying.
2,Besides,you want to convert flashlight from 3xAAA battery to one rechargeable 18650 battery

What it can do?
1,Keep battery from rattling and moving around the flashlight,these small sleeves act as a way to hold the single battery tightly in place.
2,You no longer need the AAA holder or adapter, Easily converts flashlights from 3 AAA to one rechargeable 18650 battery!

Which battery will it fit?
18650 battery,18650 rechargeable battery,18650 li-ion battery,3xAAA battery.