Originally Posted by
dougmc
The Ebay listing given doesn't say that the lights work with AAAs, though I have seen 18650 lights that come with an adapter that make them work with 3xAAA lights (and a sleeve to make an 18650 work.)
If your light accepts 1x18650 or 3xAAAs ... I strongly suggest the 18650. One rechargeable 18650 contains about 2.5 to 3x the energy of three rechargeable AAAs, so it can last 2.5x as long, or put put 2.5x as much light (if the light supports that), or something in between. Also, the LiIon batteries have lower self discharge rates (unless you use eneloops or similar batteries) so they last longer even when not used. And when it comes to charging and swapping out batteries -- one 18650 is more convenient than 3xAAAs. It's easier to keep a spare 18650 in your bag (especially with it's low self-discharge rate) than 3xAAAs.
I bought these lights from few different sellers. One came with " extension"( additional aluminum ring) to make 18650 battery fit, and all of them came with 3 AAA holder.
For me, AAA is a much better option. I ride a lot and many rides are really long, or few days long trips. It's easy to have few extra sets or to buy new batteries when needed at any store or gas station.
I made two VIDEOS showing how well this light works on AAA
https://www.youtube.com/watch?v=-_Ri...e_gdata_player