[Mark65]

Hi,
So my isg has been on and off lately, at first I thought it was regening but I belive it is more to do with the battery.
I had to wait just over 3 months to collect the car after lock down here so I'm assuming the battery was dead at the dealership, any way I used my ctek mx5 to recharge it, this took about 10 hours, fast forward a month and the isg was not working even after 3  runs of a 100 miles each, so today I put it on charge again and after 5 hrs it said it was charged so I unplugged and thought I would check it so I plugged it back in and it went to bulk charge again.
Two hours later it was still there, at this point I stopped and thought maybe the battery is shot even though its only 3.5 years old, any way went for a drive and isg worked every time, so I've ordered a replacement battery and hopefully it will be sorted, my past standard batteries have lasted twice this long, is this what agm batteries are like, a shorter lifespan.
Alternator was putting out 14.8  to 14.11on idle and battery was showing 12.8v after charging.
I'm hoping a fresh battery will be good and I won't have to do monthly top ups, Yuasa YBX9096 is the battery I ordered.
Mark

[Dazzler]

Hi Mark,

ISG is apparently hard on batteries. I say apparently because Hyundai has seldom included that function in Aussie models (our emission rules are a bit less strict than yours)

ISG has always been fairly hit and miss in Hyundai cars as there are a lot of parameters to be met (any one of which can stop it working) although battery is usually the number one cause.

There is a list on here somewhere and several threads about it.

[Mark65]

Hi Dazzler,
I'm not a real fan of stop start I would think it causes more strain on components than what it really saves and usually I'm in the habit of turning it off as soon as I start the engine, but it's there and as such I would like to know it works whether I use it or not.
Do you know if it's just a straight swap on the new battery or do I have to leave it for 4hrs once installed as I've read?, when it was serviced they would have had to disconnect the battery to change the fuel filter but that was just an hour at the dealership, not fussed at loosing stations and I read if you leave it half an hour it resets the ecu.
Thanks for any info.
Mark

[Dazzler]

I'm not aware of the need to wait any great length of time when switching batteries.

If there were an issue caused by too short a change over window, then i guess you could just disconnect the negative terminal for a couple of hours. 

[Lorian]

ISG on my 2019 car worked very reliably until lock down. for the last couple of months it never triggers, but I never do any long trips in the car now, so I presume the battery is never full enough. Not too worried about it though.

Keep in mind if you have the  cabin fan set to anything higher than 2 it wont work.

[BrendanP]

I replaced the battery on my 2015 diesel when it was only just over 3 years old. This was because the dealer said the original battery was on the way out. I fitted a Yuasa battery which suddenly failed after about 5 months. Fortunately, I bought it from a chain with a local branch, I took the battery in store, they tested it on the spot and declared it to be defective and a new one was sent out. In the meantime, I put the old battery back in. Since then, a friend with a Vauxhall Signum diesel needed a new battery so I let them have my old one, it's still going strong after 6 months. Maybe it wasn't as far gone as the dealer claimed it to be.

[Mark65]

I'm going to charge the old battery fully and keep as spare for a while, I have a ctek mxs 5 charger but not sure if it can be used with these batteries, some say yes some say no.
Ctek have brought a new version out a CT5 but I really don't want to spend another £80 on a charger,
I believe the confusion is around the desulphate at the start of the charge but if the battery is not fully discharged it should skip this step, if that's the case it should be OK to use.
God I miss my 16 year Almera, so much simpler.

[sundiz]

I have a ctek mxs 5 charger but not sure if it can be used with these batteries, some say yes some say no.

Who says no? Have you red the user manual of the charger? In older chargers you have to use cold/winter mode with agm batteries as agm cell voltage is a bit higher than in regular battery. In newer ones there is dedicated agm setting.

A known issue with agm batteries is that people put them in cars with "normal" alternator. Agm needs a bit higher charger voltage. Batteries may die in few years as they never get fully recharged. That is not probably the case here as the car is designed to use agm. If you drive only short distances the battery might not get proper charge.

[Mark65]

Hi sundiz
It was just what I've been reading on some car forums after searching for ctek msx5 and agm, and with ctek releasing a Ct5 stop and go charger I was a bit worried about using it.
Apparantly the Ct5 doesn't have the 15.8 de sulphate check at the start of the charging cycle.
Mark

[sundiz]

I have few old ctek chargers. 7A and 3.8A (or was it 3.6). Both manuals say to use winter/cold mode with agm.

I guess the recond is mainly used for regular flooded batteries. Not sure how it would work with agm physically. I was wondering that how could you even recond agm battery when the battery structure is build that way. Where would the crap drop from the plates in agm?

My 7a charger is over 10 years old and it stops working occasionally and the plastic casing is starting to crumble due many heat cycles. I think I'll get new 10amp version. It has the newer charge cycle and 3a more juice. I use it mainly to charge the 100a electric boat motor battery. Every extra amps are welcome. Few times a year I top up the car battery, especially if I drive short distances in winter. I also have defa 1204 smartcharger hardwired in the car. Whenever I use pre heating in the car, it charges the battery at the same time