That is a good idea. Ihave had regulated
devices last for years with a lot of use. Mechanical
mods have a steep learning curve. Things can go wrong and when they do it is not good. If you want to get one I personally would suggest a single battery tube (lots on clearance for about $20) or a parallel box (which are usually pretty pricey). Those operate at 4.2 down to 3.2 volts. If you get one with a normal 510 with a pin, you can use it with any topper safely and within the power range you like. Just looking out for ya.