21700 batteries will fit the EA01 with adapter, although may get slightly compressed if it’s a bit longer (unprotected) 21700.
With EA01 (with XHP50.2), I’d say 21700 batteries will be good.
Unfortunately my EA01 (with SST40), turns bluish even when using not-high-drain 26650 batteries… since it shipped with this bluish-on-high-brightness problem… BG is “still processing” my complaint for this issue… They mention will send a new light bulb to me (I wonder what it meant — I doubt they mean they’ll ship a complete replacement flashlight since they just said “light bult”…)
I received a nice Acebeam E10 today (it was my prize for the OL competition :party: ), which is the same form factor as the Astrolux EA01, so here they are next to each other for comparison.
The Acebeam is lighter built, w/o battery it is 98 gram, vs 133 gram for the Astrolux. The TIR’s are the same diameter and work the same, but they are not the same TIR. No idea if one is better than the other, these two flashlight have a vastly different emitter (SST40 and White Flat) so the beams and throw can not be compared. The Acebeam 26350 battery with charging port is well too long for the Astrolux.
Could be a chip of alu under the ledboard preventing good thermal contact with the body. Or one of the holes in the ledboard shelve that has a protruding edge.
Depending on your mood or skills you could
1)contact Banggood about it, or
2)open the head, unsolder the ledboard and have a look at what is wrong. Then assemble the proper way.