Today I had to jumpstart my car again, it has been sat there for 2 weeks not used, so I can't complain about it but with modern cars they measure the voltage of the battery when the engine is running and charge it up as needed to conserve fuel the alternator is switched on and off.
The lower the battery is when fully charged, the more the alternator will run and the more fuel the car will require when the engine is running
if you don't understand what I mean, think of it as a bucket of water under running water and as the bucket gets older it split at the top so to keep the water level at the top you will need to top the bucket up more frequently, as the bucket ages the split travels slowly down the bucket, and you need to top the bucket up more frequently until the bucket splits and won't hold water.
I tested the battery after I took the car for a long run and tested it after 15 mins of being parked up it slowly dropped from 12.8 volt to 11.9 volt, the car would start and run, but the battery was failing, it would work fine if I wanted to drive it a lot more regularly, but I don't need to, so off to Halford's I went for a new battery, I picked the heavy-duty one as the car is a big 2.2 diesel engine takes a lot of power from a battery to start it.
On removing the battery I found it was from 2015, so it's lasted 6 years, I don't think that's bad for a big diesel engine, especially as it doesn't get used much.
On removing the battery retainer, I found one of the bolts to be seized and as soon as I put some force into removing the bolt, the head broke off! This turned into an hour and a half of removing the plastic trim and clips then drilling and tapping the hole from a 6 mm bolt to a bigger m8 bolt and putting the trim all back together again
job done
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