Higher-powered; purposed design! - Viridian Weapon Technologies Tactical Energy+, 1/3n Lithium Battery - 4-Pack

First, these are perfect as intended to be used. The green insulation must stay on in some products (e.g Viridian HS-1) because the battery well is brass and the battery grounds at the end, not sides as in some other products.

Second, it is higher amperage (170) than almost all of the other (160) makes; it does last longer.

Third, as good a shelf-life as anything comparable.

Fourth, you CAN remove the green, if it's going to be stacked or used in a self-grounding product. If you are a true DIY kind of person, you could make your own shielded batteries with a cheaper make and dielectric shrink tubing, but why bother? These are clearly marked, ready-to-run, and insulated properly for the application.