The rechargeable battery can be easily attached to a helmet without venting slits using the 3M Set FastClick Battery Holder. After the base plate is attached, the battery can then be secured with a hook-and-look attachment. Not only extremely practical, but also completely secure. The 3M Set FastClick Battery Holder is a practical accessory for skiers, climbers and mountain cyclists.
Note: Only compatible with FastClick rechargeable batteries.