It's definitely worth, because a dead battery can damage the charging unit inside the Go930. Don't waite to long!
It's not verry difficult, but also not for rough hands. The only importend things are the connector for the flex-cable (be careful when opening the clamp!) and the black glue from the battery.
You must carefully warming the battery/circuit board e.g. with a hairdryer and detach the battery with "careful violent". Use a non-metallic blade as lever, but don't damage the circuit board (scratching, breaking)!
For the new battery use double-sided adhesive tape.