Just a technical perspective. All lighted nocks are made and mode out of polycarbonate. As all polycarbonate that are translucent, ultra violet will eventually degrade it. There is also a VERY IMPORTANT PART, you never drill, sand, or scratch a polycarbonate nock if you plan to hunt in cold weather. Polycarbonate nock went through a curing process which means, after it is cured, it sort of behave like glass. Any modification on it will cause score marks which can lead to cracking. In case of some lighted nock, which you will have to use a sharp object to shut it off, which may cause scoring on the polycarbonate nock when doing so. In some cases, when one reheat the polycarbonate nock, it also change the chemical configuration of the nock, and when temperature drops, the nock will break at the curing zone differential point. Which I believe is what happen to Jack Pine.
There is a cheap way and the worry proof but expensive way to do thing. Most cheaper way will work in some conditions, but not ALL conditions. Case in point, if I design Firenock with the nock NOT able to be field change. As time goes on, when the nock degrade, the entire unit will be wasted. With the electronics in Firenock, it is design to be fire and be punished no less 30,000 shots into a multi-foam-layer target and keep going. As matter of fact, the US made G-switch are rated for 12,000,000 cycles at 600G. BUT it cost a lot more money and technology to make a nock field changeable. As the technical requirement will be much higher. AFAIK, only Bayer® virgin Makelon® cured in the perfect condition can last and not degrade as temperature drop to as low as -55F. As there is no movement of any part of Firenock, and the nock is not enduring any pressure when shot with the install of extreme shock end cap. So, you need to ask yourself, how important your lighted nock is for you and how much you are willing to do to make sure it works not just some time, but every time. Last is there is way to service what you have or it is just a throw away. Some of my customer would like to use their for a life time and I make sure they do as all Firenock comes with a life time unconditional refresh policy.