The downside to having over 400 G-Shocks is you're going to have to change batteries fairly often. That's why Sjors is the master of the battery change. A classic DW-9550 needed a new CR2016, so Sjors was nice enough to show us all how how it's done. It's a good chance to take look inside this G-Shock.

Link

DW-9550 and DW-069 about to go under the kniife