I'm changing my battery to an AGM. The new AGM Interstate battery is in my garage being charged. When I picked up the battery and returned the old standard flooded (Wet) battery the sales rep noticed the side had a slight bulge, most likely caused by freezing from the previous owner. Although, the old battery performed perfectly well causing no problems, a 6 year old battery is due be swapped out. I hope the AGM battery works out well. I called my dealer and they tell me the BMS needs to be reset. I'm wondering if my Autel AP200 OBD2 scanner will suffice to do the job. I've used the Autel AP200 to put the EPB in service mode before taking the battery out to replace my brake pads and I could hear the rear EPB motor working. So the tool works. However, the Autel AP200 also comes with the option for BMS. I'm not sure if it just resets the BMS or reprograms it for either a standard battery or AGM battery. Since I'm changing to an AGM type battery do I need to have the BMS reprogrammed or is a simple reset sufficient? Also, will simply changing the battery having the power disconnected effect a reset ore reprogram BMS procedure. I don't have a battery currently in the car and will not install the new battery until I complete replacing the rear brake pads with ceramic pads, which should arrive Tuesday, so I can't try the Autel AP200 tool to see if there is an option to set the battery as AGM or flooded.

One would think the BMS would be smart enough to reset itself over time; however, is it necessary to reprogram to let it know what type of battery is installed (standard wet or AGM). The reason I went with the AGM is because the convertible top is very taxing on the battery with a remote installed.

Also, I purchased my car used with an Interstate 49/H8 battery installed. My dealer specified a T8-90 (C2P26199) as the proper battery. When I google or search for a battery from most battery retailers it shows up as 49/H8. The 49/H8 is a slightly larger battery than the T-8-90, but fits.

Given the age of our model and the sensitive electronics in the the car one would think this problem would be well known. I could not find a definitive answer from searching the forum. A comprehensive sticky thread on Battery and BMS would be helpful to all members.

 

Agreed. Added to the XK/XKR - 'How To' / DIY Repair & Maintenance sticky.



I replaced the original battery in my XK last year at five years old. Despite being kept on a CTEK, it went from normal perfomance to barely starting the vehicle over a period of ten days. I did consider AGM but went for OE Jaguar wet replacement with a VARTA H3 Silver Dynamic 100Ah battery. I'm not biased either way. My Bentley Continental GT has the equivalent AGM and it also failed after five years. I replaced it with OE Bentley specification AGM.

This is the recommended disconnect/reconnect procedure:




I was prepared to use SDD if necessary in the event of issues with the Battery Monitoring System but in the event, it was a straightforward battery swap with no issues.

For those with OE VARTA batteries, the manufacturer used to use a YY WW production code on the negative terminal post. The coding system has now changed as follows:





I read various reports of battery age across our model forums with some very impressive numbers. On my last four Jaguars, the life has been around five years.

Graham

 

DGL

Your tool seems pretty well up for the job on BMS according to this thread

https://www.jaguarforums.com/forum/x...-reset-215785/

May consider one myself!

 

As soon as I get my rear pads installed and new battery installed I will report. If the autel AP200 is up to the task it is proving to be a very useful tool indeed.

 

@GGG , thanks for posting the procedures. It is surprising that many don’t realize the significance of connecting the ground cable last.
Furthermore, I’m with you. And supply the “spec’d” battery.
The Riley is a positive grounded car (which I think makes much more sense) I had to give an education on connecting the grounded cable last...
Cheers!

 

I would never have known if I never read it here. I hope I'm ok with the AGM battery and not going with the spec'd wet battery. Furthermore, I'm replacing the battery with a 49 H8 type and not the T8 90 spec'd my the dealer. I removed a wet 49 H8 from the car which is only being replaced because it is 6 years old.

 

I can see a good technical argument for not replacing an original fitment AGM with a Wet but going the other way to replace an original Wet with an AGM should be perfectly OK.

Graham

 

Yep, this has been discussed across many forums, it's perfectly OK to replace a wet (flooded cell lead acid) battery with an AGM but it is NOT OK to go the other way, especially if you have stop/start.

 

Please for the non initiated what is an AGM battery and what is the advantage over a normal wet cell battery if any on an older car?

 

AGM stands for absorbent glass mat - the acid used in the battery is absorbed into a material instead of sitting in the cells as a liquid, as in a "wet" battery.

For more, see this site.

 

What should I use, AGM or flooded (wet cell)? Read this entire thread from 2017:

https://www.jaguarforums.com/forum/x...gm-not-182442/

Make an informed decision. It's your car, your money, and your choice.

 

The most important point made in that linked article is about the charging system:
This why the Jaguar factory says to replace your battery with the same type that it came with from the factory, namely, flooded with flooded, and AGM with AGM. They have different charging systems, and a voltage regulator from a flooded system could overcharge and cause damage to an AGM battery.

Sure, many Forum members have switched from flooded to AGM without any problems. But doing so involves risk that you should be aware of. As I said earlier, Your car, your money, your choice.

 

+1

An Absorbent Glass Mat battery is necessary on a vehicle with Stop/Start technology. This technology allows manufacturers to achieve emissions standards under laboratory or controlled conditions which are questionable in actual use. Stop/Start does unquestionably create additional stress on battery and starter motor.

Your X150 doesn't require an AGM battery but one can be fitted. The major benefit and attraction of AGM is being "maintenance free".

Graham

 

Honestly I just replaced a 2 year old AGM battery because of lower than normal voltages , replaced with reg flooded and no issues so far. Time will tell though

 

That's an abnormally short lifespan for an AGM battery. Any idea of the cause? Fried by the voltage regulator? Is the case completely flat on all sides? What about the warranty? What brand?

 

Was good brand , I think platinum AGM by autocraft. Have no clue what happened maybe it wasn't the best from the start, but now I question the supposed advantages of the AGM vs flooded

 

I installed a new AGM battery today after installing new rear brake pads. I used an Autel Ap200 to register a new battery. Following the Autel Ap200 procedure I had to turn the car on/off serval times without starting it. It never asked be the type of new battery Wet or AGM. Consequently, I'm wondering if I should have the dealer reset the BMS to recognize the new battery as an AGM battery. I don't want the BMS to think I still have a Wet flooded battery and overcharge the AGM battery. As I understand overcharging an AGM battery will damage it.

 

Does someone with a SDD know if you have an option to explicitly select AGM battery or Wet Flooded battery. My Autel Ap200 never gave me the option, but did allow me to run a procedure to reset the BMS for a new battery. I'd like to know if I should go to the dealer to have them select the AGM battery option. Will the car automatically adjust. I don't want to risk overcharging the AGM battery.

 

Have you looked in the 5.0L Workshop Manual? See the link in the Sticky at the top of this Forum.

 

Yes, nothing in the manual about SSD and a setting option to set the battery as AGM or Flooded; or, I could not find it in my search. Is the BMS smart enough to distinguish battery types and automatically make adjustments? Are their any options to set battery type using SSD (or is it SDD)?