Have had several timing lights over the years, Craftsman, Penske, Hanson, Snap-on, early ones that required physical attached to the #1, inductive, dial backs, they all failed after several years, bulbs, wires, not bright enough, inaccurate dial back.
Currently have a Flaming River battery powered, two D cells, which eliminates the two wires to the battery. About the size of a flashlight it fits in my track tool bag taking up little room. It is inductive pickup and the light is bright.. But the knock I have with it is the aim of the bulb doesn't point to where the housing points. It takes a little effort to point the beam. I'm used to it.
Being a battery powered light, yes you need to pay attention to the battery charge. Being it is also a flashlight you can test the batteries via brightness of the flashlight, dim, new batteries needed. I'm a Duracell believer for longest life, the bunny is a loser.
I see the same type light sold as a Summit product for 1/2 the money than I paid for mine 10 years ago, a knock off, probably.https://www.flamingriver.com/index.php/products/timinglights/FR1001