I have also run one of the lights dazzzzbo has mentioned for a number of years. A couple of observations, if I may. The beam pattern is pretty shitty, two circles of light, the outer is really wide and not very bright, the inner is quite a tight spot and plenty bright enough.
On it’s own, I found it adequate for riding on the road, Although the outer circle of light doesn’t have a cut off and even on low power I found it to be quite blinding to oncoming traffic, even with the spot pointing right down.
Off road was another matter, as a single light, it’s not enough. The spot is not wide enough and the wide bit, not bright enough. So I’m always moving it up or down depending on what I’m riding on, which is a pain in the arse. Two of them would be better if you’re heading off on a bridleway or byway. Currently I’m only using the one, so YMMV…
Ditch the supplied battery pack, its utter shit. Mine could hardly last an hour after a few months of use. I bought one these to replace it and it lasts for ages on full power, in comparison (they came in multiple flavours of connector, so if you get one, make sure it’s the right one). I know this doesn’t fit your requirement for AA/AAA batteries, but I think you can get a pack that you can change the batteries in.
Finally, if you cycle through the modes to go from High to Low a lot, you have to pass though Blink and Off, which can be annoying while bumping over rough ground. This light unit is pretty similar, but the light doesn’t go into Off while cycling through the modes, and it meets your replacing batteries requirement.
HTH, HAND, etc…