Do you love Modlite but don't have enough cash to outfit everything with new heads? Fret not, this new cap will allow you store a battery in your 18350 or 18650 body while the head is in use on something else. Caps to fit CR123 battery lights are also available. Made of 6061-T6 with Mil Spec hard anodize, the cap retains the fully waterproof features of Surefire compatible light bodies and tail switches. The fully anodized coating and internal rubber bumper ensure that the battery will not short and stay ready for use.