Okay, here's the deal. I'm getting a folding bike that will mostly live in my car. I know that while they probably won't explode, most rechargeable batteries don't stand up well in the long term when kept at high temperatures. So, I'd really like to come up with a solution that ensures I remember to take the light and/or battery off when I'm done using it.

This light was made for my bike, and it's the sort of setup I'm thinking of: Tern Valo Direct light with a power bank in this handlepost bag.

I'm planning on getting that bag anyway, for holding my wallet, phone, keys, etc. while cycling. If it has a power bank in there, I can just plug it in to the light when necessary. I might forget to take a headlight off, but I won't forget all my other stuff in the bag.

I think it's a pretty good system, but the light itself isn't terribly bright, and I'm wondering if I have any other options.