Seems I need a new battery. Was perfect yesterday, but was slow this afternoon when I started it up. It struggled to start again five mins later after getting fuel, understandably since it was running for such a short time. Did a 35-40 min drive, parked up and it was dead when I came back to it some 6 hours later. Everything comes on, lights up and works, but it simply refused to start - didn't even turn over. Called the AA out (as typically, my mini-booster was also dead 
, and with his jumper pack connected it fired right up just like it always has. He said it was reading 12.3v before he connected his pack and it needs 12.4v to start, hence why it didn't even try. He ruled out the alternator being a problem as it was charging at 14.4-8v while we stood there talking with it running. He did say his machine was saying it was "medium health" but in his experience that basically means it's toast, and even a full mains charge won't get much if any more life out of it. He also didn't try to sell me a battery (I was expecting that after all the above) and said Halfords or GSF would be way cheaper.
Anyway, question is: if the battery is changed like for like (I’m assuming this has an AGM battery in it, as that’s what everywhere suggests) will it need coding/registering to the car or will it just carry on fine? I've heard conflicting reports: some have said just rock the steering lock to lock a couple times and everything resets and will be fine, others have said it needs coding/registering to the car for the stop/start to work properly (which I've disabled with a cheat cable anyway)
, and with his jumper pack connected it fired right up just like it always has. He said it was reading 12.3v before he connected his pack and it needs 12.4v to start, hence why it didn't even try. He ruled out the alternator being a problem as it was charging at 14.4-8v while we stood there talking with it running. He did say his machine was saying it was "medium health" but in his experience that basically means it's toast, and even a full mains charge won't get much if any more life out of it. He also didn't try to sell me a battery (I was expecting that after all the above) and said Halfords or GSF would be way cheaper. Anyway, question is: if the battery is changed like for like (I’m assuming this has an AGM battery in it, as that’s what everywhere suggests) will it need coding/registering to the car or will it just carry on fine? I've heard conflicting reports: some have said just rock the steering lock to lock a couple times and everything resets and will be fine, others have said it needs coding/registering to the car for the stop/start to work properly (which I've disabled with a cheat cable anyway)
