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23rd March 2024, 15:13 | #31 | |
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Simon
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23rd March 2024, 19:35 | #32 |
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I was hoping it might show how much it's dropping over 24 hours, I'll check the voltage drop after starting tomorrow. Cheers, Dave
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24th March 2024, 12:42 | #33 |
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Right so this morning I took a reading on the battery and it was 12.18 volts across the terminals then following advice (SD1too) I took a reading during starting and it went from 9.odd volts momentarally (it was so fast I couldn't catch it all) and then jumped to 10.3 volts across the terminals before the car started. I stopped the engine and the voltage read 11.9. So it looks like the battery is not quite dead but very poorly I still intend to try to rejuvinate the battery with the smart charger and leave it off the car for a few days to check the voltage drop before shelling out for a new battery. The RAC fitted the battery two years to the day more or less and charged me £30 to come and check it yesterday because I'm no longer a member (but thats another story) but found nothing wrong on his box of tricks, makes me wonder if the software is designed not to report a faulty battery if it's borderline
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24th March 2024, 13:00 | #34 |
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my cdti battery was borderline due to age and I followed Arctic's advice with buying a new Tayna battery (around £90 delivered). Which has been very good for my low miles with occasional long trips often standing for 3 weeks without use but remains strong.
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24th March 2024, 13:27 | #35 |
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You measured 12.18V this morning but I am not sure when you last charged it. If it was fully charged recently and hasn't been loaded then 12.18V is very low, it should be approaching 13V. Google 'battery university lead acid state of charge' and look at the graph. Even though your battery is only 2 years old if it has spent a long time below 90% state of charge it may have sulphated and despite what you read on the internet I don't think significant sulphation of a lead acid battery is reversible. I think if you carry on using it it will let you down. When my dad was still driving in his 70s and 80s he used to ask me to fit a new battery on his Rover 45 when it was 3 years old even if it tested OK. He said he would rather pay a bit more than be stuck somewhere away from home in the dark and the rain. I could see his point.
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24th March 2024, 16:06 | #36 | |
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Following charging for 24 hours, you'll have to return it to service to find out if it can deliver starter motor current reliably. Is that practical or do you rely on the car every day for work? Simon
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24th March 2024, 18:04 | #37 | |
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24th March 2024, 19:16 | #38 | |
Doesn't do things by halves
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Out of interest, which comments have resulted in this change of mind? Simon
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24th March 2024, 19:25 | #39 |
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25th March 2024, 10:16 | #40 |
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I hope my post 35 doesn't push you to prematurely replace your battery. I returned to your post 1 and noted that you weren't actually having battery problems you just wanted to know if it would still start after being parked for a prolonged period. I mixed your post up with another where the op was actually having battery problems. If your alternator is charging and the battery is fully charged when you reach the airport and your car's sleep current is similar to mine (16mA) you should be alright. After two weeks your battery will have lost approximately 20% of its charge. Despite keeping an eye on the condition of my car battery I still have a lithium-ion jump starter in my boot just in case.
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