A car bag, bugout bag, Zombie Apocalypse bag, etc., are all typically going to get neglected, so it’d be best to have long-life primary cells in there, like ’123s or lithium primaries, else low-discharge NiMH cells like eneloops or amaloops.

And never ever ever ever ever use alkaleaks in any lights.

Regular Li cells aren’t suited to temperature extremes inside a car, from freezing in the winter to baking in the summer.

Just keep that in mind.