Don't forget, switching from a AAA battery to a 10440 Li-ion battery, you can boost the maximum output from 200 lumens up to 300. If you try it, let me know what you think. I was impressed. I like their AA size flashlights even more than the AAA size. They're quite a bit fatter, but only ~1/4" longer. The i5R EOS is the rechargeable version of i5T EOS, with a customized rechargeable battery with an integrated Type-C interface. It's 350 lumens that drops down to 150 after 10 minutes, and it will run 37 hours at 15 lumens. The AAA flashlight can run 21 hours at 5 lumens, but 15 is a lot more useful than 5. Even on my bigger flashlights that have low, medium, high, and turbo, I use low the most. But low on some is closer to medium on smaller ones. There are a lot of flashlights it looks like Olight discontinued, and the AA size is one of them. I didn't see any on their site, but they had them on Amazon.