When I was talking to the chap in the garage he was explaining how these stop/start engines have smart alternators that "talk" to the battery bms, as well as the engine management system. Said they need multiple long runs so that the smarts know when best to charge the battery and when to activate the clever features. For instance, on mine, the stop/start disables itself if you have the indicator on...Peter wrote: ↑Tue May 05, 2026 7:53 pmA long motorway journey in hot weather can kill a battery if it’s on its last legs, you might have just gotGeraldTheBonzai wrote: ↑Mon May 04, 2026 10:29 am Think I need to get the battery replaced on the car. It's one of these eco stop/start jobbies. Even though it's warm and had some longish runs, the stop/start isn't kicking in.
Had it serviced a couple of months back and the diagnostics flagged it as getting old. Unfortunately Fords are a bit picky on the type of battery you use plus the BMS needs to be reset/recalibrated, so looking like a dealership job...![]()
it through winter when journeys are much shorter, I was told this by a mate, a RAC mechanic.
When I was working I used to do a fair amount of business mileage. Now i've packed it in, for most of the week the car sits on the front or just does short trips. I still like it but can't help feeling that i'd be better off with something a bit more basic, without all the modern tech.