For me:
An advantage of Eneloop is that it retains its charge better than LiIon, if stored in a hot car during summer..
What other advantages can you think of, for running an Eneloop instead of LiIon?
A few I can think of:
-AN ACTUALLY STANDARDIZED SIZE
-They have a significantly longer lifespan (which is why I don't use Eneloop Pros, either)
-They contain much less energy, which is good if something goes very wrong (say, and accident)
-There's no need to monitor battery states
-You don't have to worry about LVP and/or a protection circuit
-A random person is more familiar with them, in case someone unfamiliar ends up using my light
-They're insanely cheap on a per-charge basis
-I have lots of them already
-Great size format for anything that's low power
A more controversial point:
-People usually say Li-ion is the better choice in cold temperatures, but that's generally because they freeze some batteries and then measure them. In usage, I find that eneloops perform really well out in the cold, and I've seen USAGE tests that showed surprisingly similar performance. I don't know if they "warm up" quickly or what, but in use, they're great. So, despite what is "common knowledge," my personal experience in winter has been very satisfactory with eneloops.
Eneloops are just a great option of not having to think about your batteries, especially if things are going very wrong.
I know, I know. Everyone in this hobby insists that Li-ion cells are "barely more work," but I don't like making spreadsheets, I don't like using label makers, and I don't like monitoring things. I like a nice light I can pick up whenever, and just turn it on. Every time someone insists Li-ion cells are "just as easy," it comes with a big helping of asterisked statements. And, primary cells in 2024 are just silly wasteful. You can charge an eneloop, stick it in a drawer, and have a "good enough" level of light available for years.
And, of course, AA/AAA cells are used in literally trillions of devices, so the ubiquity of the cells is great. I've definitely swapped batteries from an unused remote or something to power a light during a task. And, on top of that, I can buy a 24-pack of AA and AAA eneloops, and power tons of lights AND remotes, etc. I have a few Li-ion flashlights, and it's already annoying how many different cells and chargers I have to support that. I have two small cases of a dozen AA and AAA eneloops on my desk. I have a whole shelf strewn with 16340, 18350, 18500, 18650, 21700, and 10440 cells..Of course, I have to have button tops, flat tops, protected, and unprotected of each size, as you NEVER KNOW what will work in what. The lack of standardization means when I get an Li-ion cell, I often end up having to buy a cell with it, or specially for it. That's wasteful and silly.
Essentially, if you're using a low power device, I don't see why you'd want to use a Li-ion cell. For high power applications, it makes sense. For a sub-200 lumen light that is focused on it's Zombie Apocalypse reliability, AA (eneloop) support seems like the perfect fit.
EDIT: I forgot the recycling aspect, too. Lithium, while theoretically able to be recycled, often isn't, and in a LOT of places, it can't be. Lithium polymer is becoming increasingly common, and that one is even more of a recycling headache. Meanwhile, NiMH batteries can be brought in with most e-waste, and will be recycled.