I got 4 of these in in a bulk lot of Lego, but the lamp is getting quite dim in a couple of them.
Is it possible to change the battery in a 54604 light brick?
It looks like the brick should open, but I don't want to force one apart and break it.
There's a YouTube video which explains how you can replace the battery in that light brick.
Quoting from that site:
Taken from the additional notes of this bricks Bricklink catalogue entry.
I occasionally use the minifig-scale Axe, Crowbar or Screwdriver to pry plates, tiles and other bricks. If you don't have a screwdriver of your own it might be possible to use one of these utensils to unscrew the casing depending on how tightley screwed in place your brick is.
This doesn't apply to bulk LEGO purchases, but in some cases LEGO sets will include instructions on how to replace the battery.