E89 2.3 Sdrive battery replacement.

[Naylz]

Hello everyone, I recently changed my E85 for nice shiny E89 2.3 Sdrive, the E85 was starting to rot and develop more frequent faults I was wondering what the procedure is for changing the E89 battery, can I just disconnect and fit a new one or will that cause all sorts of issues?, I do have another good battery so could I somehow connect that like you would for a jump start using jump leads, I guess there are points to connect the leads under the bonnet? My thinking is it will never not have 12v when removing the original battery and replacing with a new one?..what are your thoughts.? I am not having battery issues at present but as I don't know the age of the current one I would rather not wait for it to fail Thanks PS anything else worth looking out for on the E89's??

 

[Mr Tidy]

I'm pretty sure the early E89s didn't need any coding for a new battery so it's just a question of removing the old one and fitting the new one - the worst that can happen is you'll need to reset the clock!

 

[Naylz]

That sounds good, mine is a 2010 so fingers crossed

 

[Zed Baron]

I thought all E89s have to register a new battery as they are fitted with an intelligent battery sensor. Mines a 2009 and I changed the battery and registered it at the beginning of this year. Go to someone like Tayna batteries to get the best price. The production date of your current battery will be stamped on one of the battery posts, it will be week and then year.

 

[Naylz]

So what happens if you disconnect and don’t re-code/register the battery? What is it actually for?….I guess registering the battery is a garage job not something I could do with an obd2 reader?

 

[SV8Predator]

So what happens if you disconnect and don’t re-code/register the battery? What is it actually for?….I guess registering the battery is a garage job not something I could do with an obd2 reader?

An OBD2 reader is for pulling fault codes relating to the emission control system. Therefore in practical terms, engine only.

There are other devices (many recommended or denigrated on this forum) that can do further functions, like registering a new battery.

The new battery needs to be "registered" to tell the car that, umm, it has been fitted with a new battery. Disconnecting the battery currently fitted to the vehicle and then reconnecting doesn't have to be registered as nothing has been changed.

The E89 charging system is clever enough to know just how much charging is necessary for the battery that is fitted. An older battery may need more charging, for example. A brand-new fresh battery may need less charging. You don't want to overcharge your new battery, hence the reason to "register" it.

 

[mcbutler]

County batteries for best pricing DONT go to manufacturers

 

[Naylz]

So what happens if you disconnect and don’t re-code/register the battery? What is it actually for?….I guess registering the battery is a garage job not something I could do with an obd2 reader?

fantastic reply, all seems very clever, probably too clever for a vehicle that doesn't even have automatic lights or cup holders Whatever was wrong with an alternator regulator....ah well so now I know, which answers my question on whether I could simply keep 12v supply on from another battery whilst swapping out old for new in the boot.......I will likely overcharge the new one. Thanks for the detail.

An OBD2 reader is for pulling fault codes relating to the emission control system. Therefore in practical terms, engine only.

There are other devices (many recommended or denigrated on this forum) that can do further functions, like registering a new battery.

The new battery needs to be "registered" to tell the car that, umm, it has been fitted with a new battery. Disconnecting the battery currently fitted to the vehicle and then reconnecting doesn't have to be registered as nothing has been changed.

The E89 charging system is clever enough to know just how much charging is necessary for the battery that is fitted. An older battery may need more charging, for example. A brand-new fresh battery may need less charging. You don't want to overcharge your new battery, hence the reason to "register" it.

 

[Zed Baron]

When I changed my battery to a new one (same Z4 model as you and same age) I just disconnected the old one and then swapped in in the new one, no problems, everything worked ok.I've got one of these which allowed me to register the battery: https://www.amazon.co.uk/gp/product/B08DG22XHF/ref=ppx_yo_dt_b_asin_title_o09_s00?ie=UTF8&psc=1
You could always ask if there are any nice forum members near you with Carly or similar that could do it for you.

 

[mr.tourette]

Yup..put up your location, I'm sure someone can register it for you no problem..I'm in north wales and will happily do it for you for free if you are local enough

 

[Naylz]

I’m in Wincham, near northwich in Cheshire. I have done a bit more googling, and it transpires the code reader I had for my E85 also can be used on this E89, it is a “creator C310+” which apparently can register the battery….however I’ve no idea how and the instruction book is poorly translated Chinese and doesn’t mention that function. I don’t think I am desperate to get it changed, I noticed when I was sat in the vehicle with the radio on but engine off the orange coloured battery light came on, not sure if that is a gentle warning that you are using power without the engine running or if it’s an early indication the battery is getting low??. Anyway I have a new 096 battery in my garage that I bought for my E85 but only used for 2 months….fairly sure that fits the E89 too.

 

[Stash36]

Yes you are correct on the battery light coming on, and it should have switched the radio off as well? I was surprised my 12 year old e89 was still on its original battery. Putting the radio on without ignition it only ran for about 30 secs then that battery light came on. The car still started absolutely fine, it's just pretty clever at keeping enough juice for a start. When I added a new battery, the radio would stay on without issue. I later register the battery with Carly which I would agree is how it knows how much to charge.

 

[mr.tourette]

You need an agm battery for the e89 pal

 

[Naylz]

Pretty sure its original battery isn’t an AGM, it has a vent drain tube fitted…didn’t think gel/glass batteries had those??

 

[Zed Baron]

Pretty sure its original battery isn’t an AGM, it has a vent drain tube fitted…didn’t think gel/glass batteries had those??

what colour is your original battery? Does it look like this one, this was my original BMW battery in the same model and year as your car. All black BMW batteries are AGM. If you look at the negative post bottom left, you will see the production date of the battery (week 23 year 09)

 

[flybobbie]

I think agm still have vent valve in case of over pressure.

 

[Zed Baron]

I think agm still have vent valve in case of over pressure.

Ive got one on mine

 

[B21]

Original battery is an AGM if it’s a UK spec car…that battery does have a vent tube attached.

All lead acid batteries have a vent valve unless they are a very old fashioned wet battery with removable caps to top up.

All E89 batteries need to be registered..if the capacity is changed it needs to be coded to suit.