Battery life

The battery on my VW is now 10 years old. Still starts the car - even after leaving the parking lights on for 3 hours. Car is VW 1600 diesel with 'BlueMotion' stop start feature - that has stopped working presently, no doubt due to the battery age. Battery capacity, if I'm reading the figures correctly 135 Amp Hour, which I'm sure has a great benefit in the ability of the battery. The battery is the original one on the car.
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Our yeti is 7 y/o. it has the original battery

last Saturday I was waiting in the car during the kids gym class and I had the ignition switched to on so my phone could charge up.

But I also had the lights on and didn’t notice. I was probably sat like that for 30 mins. So the car wouldn’t start and I ended up getting help from someone with jump leads.

the car has been fine since.

so my question is:

is the battery Likely to need a replacement Now / soon

or is it a good idea to charge up the battery to boost its charge for 10hs approx.
Luck you having a YETI, wonderful wonderful cars, we have stupidly traded ours in for a piece of crap.

Your Battery - do you have a multimeter? after the car has stood for a while check the voltage. Get someone to start it and see what the voltage drops to, and then finally what is the voltage when the engine is running.
I must say I like our Yeti - 2.0 diesel 150BHP with adblue, 65 plate 4x4 - it's the Outsider(?) model (higher ground clearance.)
The only niggle....on the bottom of the door corners it tends to get the odd rust mark, which I'm forever scraping back and touching in....apparently Skoda know about that one.
It only has 33k on the clock and has averaged 50 MPG.
John :)
I must say I like our Yeti - 2.0 diesel 150BHP with adblue, 65 plate 4x4 - it's the Outsider(?) model (higher ground clearance.)
The only niggle....on the bottom of the door corners it tends to get the odd rust mark, which I'm forever scraping back and touching in....apparently Skoda know about that one.
It only has 33k on the clock and has averaged 50 MPG.
John :)
The on-board computer thing in ours* suggested around 50mpg too, but its long term average from how much fuel went in at the pumps and accounting for the inaccuracies of the mile-ometer were around 44mpg

I think it may have been my favourite car of all time, and if they were still making them we would have got another.

*(64plate, non adblue, 140bhp, 4x4, auto)
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Rule of thumb for me, anything over 5 years is good going for a car battery and 3 years for a motorcycle battery.
I was sure the battery on my Honda Jazz was original, however when it failed a couple of weeks back it said Halfords so could not be original, but the Jaguar battery was changed by the dealership around £300 because the car would fail to start, I did not think it was battery, as after leaving it for 5 minutes, it would start the car and engine flew over, no sign of struggle, so I blamed engine management, seems I was wrong, new battery did same, and RAC man found the foot, wife has too light a right foot, not what I would have said as I cling to the car the way she drives, but seems she had been touching the brake while parked and depleted the vacuum so it needed more pressure on brake peddle to start the engine, she was giving enough pressure so warning did not come up saying press brake peddle, but not enough to make the sensor allowing it to start.

Lucky I keep old battery to use on caravan, and have noted using smart charger with just a 0.1 amp charge rate it would sit at 13.4 volt, and left for 3 months without charge, it was back to fully charged state within the hour, with a charger with max output of 3.8 amp. Which did not seem to be the behaviour of a failed battery.

Now the failed battery off the Jazz that would drop voltage as soon as taken off charge, and clearly had a failed cell.

But when I was an auto electrician I simply did not have the time to fiddle with batteries, if the battery did not recover in a couple of hours enough to start the car, it went in scrap. Today I have time on my hands to play, and I have in last 5 years had a few batteries which would have gone in scrap, which I have had time to leave on a charger for an extended time, and also an energy meter so I could monitor what the charger used, and this produced a surprise.

The charger a Lidi ULGD 3.8 A1 3.8 amp smart charger will not charge a battery below 3.8 volt (6 volt) 7.3 volt (12 volt) or above 15 volt, so only way was to put the sulphated battery in parallel with a good battery, other wise it would simply switch off, the charger has 4 charge rates 3.8, 3, 0.8 and 0.1 amp plus zero when under 12 Ah is selected, but once it has been through the 3.8 and 3 amp stage it will not auto return to those rates it will only alternate between zero, 0.1 and 0.8 amp rates. This was good as far as I was concerned as if the sulphated battery has a shorted cell I don't want a high charge rate.

So the pair were put on charge, and the charger went through the stages, and sat at zero output, and it sat there for 10 days, had I not had an energy meter connected to PC I could have not monitored a battery for so long, but basic thing they were just left and I would glance on the PC every so often. Then it was as if some one had flicked a switch, the charge rate jumped to 0.8 amp and remained there until battery fully charged. Then returned to 0.1 then zero charge rate, this was with a 7 Ah battery, so repeated on second 7 Ah then a 75 Ah battery, all three had basic same result, with the 75 Ah once it started to charge I removed leads and reconnected so it charged at 3.8 amp rate, which it turned down to 3 amp rate very fast as voltage hit 12.8 volt then held at 3 amp for reasonable time until hit 14.1 volt then for a very long time at 0.8 amp until hit 14.4 volt then settled down to 12.8 volt as soon as it drops below 12.8 charger ups the charge rate, and at 14.4 volt it drops it again, so a fully charged battery sits at 12.8 volt 95% of the time, the raise to 14.4 and drop again is so short of a time that one would be very lucky to see it.

These recovered batteries seemed non the worse for their time left abandoned, and I realised my attempts in the past to recover batteries before the smart charger likely killed a potentially good battery.

So then we look at history, back in the days of the dynamo, we had flooded batteries only then, and we were told once a month to use an equalising charge, we over charged the battery at a very low charge rate over night so any poor cells would come up and good cells would loose water which we would replace once equalising charge complete. So as far back as we can look, we knew charging a battery took time, which we don't have when fitted to the vehicle.

We know unless a battery is fully charged every so often, it looses capacity, either active material falls off plates, or it becomes part sulphated, now I now know it can take 10 days to remove the sulphur from the plates, time on charge is important, so what seems a faulty battery, leave it on a smart charger for a couple of weeks, and it may well recover. It just simply takes time.

However with cars being not used during lock down, this has become a problem, I have three cars in the family and other batteries, from caravan, the jump start set, the mobility scooter, the e-bike is not lead acid so that's no problem being left. But it seems the smart charger is doing its rounds, no soon has one battery been charged, and it is moved to the next.
I don't know what all the fuss is about.
I regularly leave my car untouched for two months. The battery is five years old, there's always plenty life in it and, the car always starts first time.
Bought my wife's car in 2006, in 2019 sealed battery died suddenly, no previous warnings.
Upon inspection I found it was a Sainsbury's branded battery manufactured in 2004.
Not bad, at 15 years.
I replaced it with a Bosch carrying a 5 year warranty.
I doubt it will last more than 5 years and 1 month.
Couldn't find batteries in my Sainsbury's, shame.
I would say this
Jazz and Kia charging 7.jpg
is typical when recharging a battery, the curves are the energy monitor software in real terms straight lines, but the bulk of the charging is fast, but the finishing off is slow, still at 0.8 amp charge rate 24 hours after started to charge, and it is the finishing off that stops the battery over time loosing its capacity. With the Jazz at I think at around £40 when it failed in the Tesco car park I walked to motorist shop, and bought a replacement without really a thought, but with the Jag at £300 battery failing is much more of an issue, for one thing needs to go on a computer to tell engine management new battery has been fitted, so looking after the battery is far more important.
I must say I like our Yeti - 2.0 diesel 150BHP with adblue, 65 plate 4x4 - it's the Outsider(?) model (higher ground clearance.)
The only niggle....on the bottom of the door corners it tends to get the odd rust mark, which I'm forever scraping back and touching in....apparently Skoda know about that one.
It only has 33k on the clock and has averaged 50 MPG.
John :)

Yep we are getting the rust marks in that position too. I am just leaving them.

Amazing car. Used generally all week by my wife for short runs, but we get out on the weekend for a good day out.

The battery is still fine and i have decided not to replace. I will try give it a charge when we get some time.

Its done 78k now and is 7 years old this Nov.

The only issue has been the clogging of the exhaust system, but it must be mild as we have never gone into the safety mode which i think means you drive slowly. It came on again recently, but this time i knew what to do so added a tube of arch oil (£25 one), and after 5 days the warning light has gone out. Dont get the remap fix !
Can’t say I’ve heard of Arch oil....its Forte additives for me, but my motor never gets less than a 20 mile run and I only use V Power diesel.
No issues to date but I’m dreading taking the EGR out.....can’t even see it!
John :)
I am told adblue also goes off, crossing fingers, and had a waxing problem with a Kia which additive cured, filled up in summer and did not use until winter. Petrol can also go off, but cars rarely stand long enough, had problems with lawn mowers.

I have only found one supermarket in UK that sold cars, a Coop just outside Blackpool, anything from pin to car, but the Asda supermarket when large only had same range as small one, you just walked twice as far.

I want to buy a new battery, not one which has been sitting around for 6 months, so would want to get from some where selling a lot, and want it fitting without loosing radio codes and if stop start have the engine management set to new battery.
I have decided to try two chargers so at 0.2 amp instead of alternating 0.1 amp and 0.8 amp, the graph now steady Jazz and Kia charging 43.jpg want to see how it goes, and if voltage raises, yes I know I could likely simply take it off charge now, however in the back of my mind I remember it took two weeks for the sulphated battery to start charging, so there could be some sulphation, but also have read pulsing is not good for the battery, so will leave a day and see what happens.
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