Thanks for your advice, sorry i haven't said this earlier, been away on holiday! I've just been to the bike this morning and the battery wasn't dead before but it is now! Still holding enough for the alarm, just. Bought a Haynes Manual now so i'm gonna have a go at changing it myself, once i've got the battery charged, do you know if you can charge the battery while it's still connected to the bike? Only if i disconnect it i've gotta pay to get the alarm/immobiliser re-coded!