The battery connections on the APALS are soldered to the battery which is roughly the size of a 2032 coin cell.
The other point that would cause a slight problem with changing the battery is that the whole thing is sealed in a plastic sleeve making it waterproof. You could cut your way in and glue it on the way out, but I dont think you would be able to do this too many times before the sleeve becomes unuseable.
I think I will just replace once they are flat and have done with it. After all, they have a really good runtime and will work out a lot cheaper than lightsticks.