Swatch Chronograph problem

I have just changed the battery on my Swatch Irony chrono, and now the center sweep chrono hand is off '12' by 2 seconds, the 60 minute counter hand is also off by 2 mins, and the hour register hand is out by the same amount when they are reset. Is this something that is easy to fix, or should I just junk the watch? Any advice would be really useful.

Junior