Battery voltage readings
#21
03-12-2014 | 01:04 PM
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From: Malta, Europe
I suspect some sites are sufficiently dumb to give to an X100 (old shape) XKR battery spec rather that the X150 (new shape). Have encountered that problem elsewhere on car parts sites. For the X150, you need a BCI Group 49 battery:
L x W x H
381 x 175 x 192mm
15 x 6 7/8 x 7 3/16"
I'm guessing a few mm smaller or larger won't hurt - if smaller, you can use packing pieces.
L x W x H
381 x 175 x 192mm
15 x 6 7/8 x 7 3/16"
I'm guessing a few mm smaller or larger won't hurt - if smaller, you can use packing pieces.
L x W x H
353 x 175 x 175mm (lower height than 192mm)
Interestingly, the Varta web site Products | Start-Stop | Start-Stop Plus | 595 901 085 | VARTA gives this battery for the XK which, at the height you mention, is higher than the OEM T8 size. From what I can gather, the OEM T8 size has a 175mm height. At 17mm higher, the Group 49 size might not fit in the convertible because of the battery cover upholstery.
Why can't life be simpler?
#22
03-12-2014 | 05:48 PM
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From: London, UK
Is the cover actually lower in a convertible? I haven't had any experience with the 'vert. But I agree, the standard battery is the Varta T8, which (based on those dimensions) would be a Group 93.
And that's a bit of a worry, because I was planning to replace mine (when it eventually croaks) with an Odyssey PC1350, which is 353x175x190 - and Odyssey says that's a BCI Group 49. Sigh. I'll have to figure out how much clearance there is.
And that's a bit of a worry, because I was planning to replace mine (when it eventually croaks) with an Odyssey PC1350, which is 353x175x190 - and Odyssey says that's a BCI Group 49. Sigh. I'll have to figure out how much clearance there is.
#24
03-13-2014 | 06:30 AM
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Is the cover actually lower in a convertible? I haven't had any experience with the 'vert. But I agree, the standard battery is the Varta T8, which (based on those dimensions) would be a Group 93.
And that's a bit of a worry, because I was planning to replace mine (when it eventually croaks) with an Odyssey PC1350, which is 353x175x190 - and Odyssey says that's a BCI Group 49. Sigh. I'll have to figure out how much clearance there is.
And that's a bit of a worry, because I was planning to replace mine (when it eventually croaks) with an Odyssey PC1350, which is 353x175x190 - and Odyssey says that's a BCI Group 49. Sigh. I'll have to figure out how much clearance there is.
#25
03-13-2014 | 09:38 AM
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Joined: Jun 2011
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From: Ogdensburg, NY
With a digital voltmeter across the battery terminals, what should be the voltage readings in the following conditions?:
A) Vehicle off (trunk open with smart key),
B) Vehicle on, but not started,
C) Vehicle started.
I am getting 11.94v in A and 14.0v in C. Will try to get the B reading. Battery is still original from September 2008. Vehicle is XKR convertible.
Cheers!
A) Vehicle off (trunk open with smart key),
B) Vehicle on, but not started,
C) Vehicle started.
I am getting 11.94v in A and 14.0v in C. Will try to get the B reading. Battery is still original from September 2008. Vehicle is XKR convertible.
Cheers!
#26
03-13-2014 | 11:37 AM
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From: London, UK
Fortunately, the battery is clamped at the bottom, so I don't have to worry about the length of tie-down bolts. That was an issue on my XJ-S and XK8 - if the battery height was too great, the long bolts that held the top bracket on were too short.
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ejjbee (03-13-2014)
#27
03-13-2014 | 01:55 PM
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#28
03-15-2014 | 10:46 AM
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I'll have to try sticking something 15mm thick on top of the battery posts and see if the cover fits. Will post the results when I get around to doing it.
Fortunately, the battery is clamped at the bottom, so I don't have to worry about the length of tie-down bolts. That was an issue on my XJ-S and XK8 - if the battery height was too great, the long bolts that held the top bracket on were too short.
Fortunately, the battery is clamped at the bottom, so I don't have to worry about the length of tie-down bolts. That was an issue on my XJ-S and XK8 - if the battery height was too great, the long bolts that held the top bracket on were too short.
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Ngarara (03-15-2014)
#29
03-15-2014 | 11:02 AM
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From: London, UK
Thanks, mate - that's very useful. So, I should be able to squeeze an Odyssey PC1350 in there when I finally have to replace my battery. Touch wood, it's been fine after an initial glitch (too long sitting on the showroom floor, I expect). I drove the car yesterday after having left it for 9 days, and that last run was only 20 mins each way - but it fired up fine, no gremlins. And I don't have the solar panel permanently fitted yet, so that wasn't the reason.
#30
03-15-2014 | 11:13 AM
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Thanks, mate - that's very useful. So, I should be able to squeeze an Odyssey PC1350 in there when I finally have to replace my battery. Touch wood, it's been fine after an initial glitch (too long sitting on the showroom floor, I expect). I drove the car yesterday after having left it for 9 days, and that last run was only 20 mins each way - but it fired up fine, no gremlins. And I don't have the solar panel permanently fitted yet, so that wasn't the reason.
#33
05-16-2018 | 04:13 PM
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From: Switzerland
Voltage readings fully loaded new Varta Silver Dynamic
Dear all,
about 2 weeks ago I exchanged myself the battery in my new to me 2011 XK with 9k mileage on the car, because I didn't know how old the former battery was.
Neither with the JLR OEM battery before nor with the new Varta Silver Dynamic 100 Ah replacement battery (190 mm height fits no problem btw) I have ever had any problems or gremlins to date.
Today I received my OBD wireless dongle and connected it the XK and the iOS OBD Fusion App to get some readings. Everything fine, with the only thing that struck me was that with the enigne running - idling or driving on the road or highway - the highest voltage reading I saw was 11.9V. At steady highway speed: 11.4V. The highest reading of 11.9V was reached when decelerating for a couple of 100m on the highway, such as eg on a long exit ramp (this could be an indication for some kind of clever load management, letting the generator only work as needed - but not sure the XK has such clever stuff on board).
I have now also measured the voltage when car is idling in the garage after the drive with a classic voltage meter at the battery terminals: 12.2V.
These voltage readings seem very low!
Like 1V to low from what is to be expected, reading this thread.
What could case this? Could it be somehow, because I fully charged the battery with my Ctek about 3 days ago? The car is very new in mileage...
There are no “low voltage” or “not charging” messages in the dashboard. Not seen on this car to date.
If I measure the voltage with engine not running, cold engine, ignition off, I get approx. 12.5V e.g. after 3 days of no usage. With my former battery it was 12.3V.
Any opinions?
BR,
ter
about 2 weeks ago I exchanged myself the battery in my new to me 2011 XK with 9k mileage on the car, because I didn't know how old the former battery was.
Neither with the JLR OEM battery before nor with the new Varta Silver Dynamic 100 Ah replacement battery (190 mm height fits no problem btw) I have ever had any problems or gremlins to date.
Today I received my OBD wireless dongle and connected it the XK and the iOS OBD Fusion App to get some readings. Everything fine, with the only thing that struck me was that with the enigne running - idling or driving on the road or highway - the highest voltage reading I saw was 11.9V. At steady highway speed: 11.4V. The highest reading of 11.9V was reached when decelerating for a couple of 100m on the highway, such as eg on a long exit ramp (this could be an indication for some kind of clever load management, letting the generator only work as needed - but not sure the XK has such clever stuff on board).
I have now also measured the voltage when car is idling in the garage after the drive with a classic voltage meter at the battery terminals: 12.2V.
These voltage readings seem very low!
Like 1V to low from what is to be expected, reading this thread.
What could case this? Could it be somehow, because I fully charged the battery with my Ctek about 3 days ago? The car is very new in mileage...
There are no “low voltage” or “not charging” messages in the dashboard. Not seen on this car to date.
If I measure the voltage with engine not running, cold engine, ignition off, I get approx. 12.5V e.g. after 3 days of no usage. With my former battery it was 12.3V.
Any opinions?
BR,
ter
Last edited by Ter11; 05-16-2018 at 04:45 PM.
#34
05-16-2018 | 04:37 PM
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From: NY
I would look into and consider the following. 1st put a BATTERY CHARGER on the battery and charge it until it is full. Use at least a 10 amp charger. After a full charge measure the battery voltage with the car off . It should be a min. of 12.6 volts. Did you replace the previous batter with a like battery meaning was it a flooded battery or an AGM type. Last I haven't seen anywhere about resetting the the battery module or the ECM where it would make a difference but you should consider having the dealer reset these 2 modules. They tell this later charging system how to charge. With the 2010-2015 XK you should see voltage swings from 12.0 v to 14.4 v during a normal drive. You would see the higher voltage during de-acceleration and the lower voltages during normal driving. I normally see 12.5-12.6 v during my drive and if I coast down a hill with my foot off of the gas it will go to 14.0-14-4v. I understand this is normal .
#35
05-16-2018 | 04:55 PM
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Joined: Feb 2018
Posts: 346
Likes: 41
From: Switzerland
Thanks!
I had a traditional wet (aka flooded) 90 Ah OEM Jag battery built in before (made by Varta). The replacement is a Varta Silver Dynamic, also a normal wet battery with 100 Ah.
Here some more info on my battery swap: https://www.jaguarforums.com/forum/x...7/#post1887720
Br
ter
I had a traditional wet (aka flooded) 90 Ah OEM Jag battery built in before (made by Varta). The replacement is a Varta Silver Dynamic, also a normal wet battery with 100 Ah.
Here some more info on my battery swap: https://www.jaguarforums.com/forum/x...7/#post1887720
Br
ter
Last edited by Ter11; 05-16-2018 at 04:58 PM.
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Popbumper (09-15-2020)
#36
05-28-2018 | 07:50 PM
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Joined: Feb 2018
Posts: 346
Likes: 41
From: Switzerland
Quick update. Now using the car regularly- almost every day- and with some weeks ago since it was the last time connected to the ctek, the voltage readings when driving have gone up. I now get approx. lows of 12.3 and highs up to 13.9, ie. when coasting.
These newer XKs clearly seem to have an intelligent charging management which is why I probably got the low voltage before, just some days after having fully charged the battery with ctek.
BR
ter
These newer XKs clearly seem to have an intelligent charging management which is why I probably got the low voltage before, just some days after having fully charged the battery with ctek.
BR
ter
#37
05-28-2018 | 08:33 PM
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Joined: Sep 2013
Posts: 5,209
Likes: 1,839
From: NY
Quick update. Now using the car regularly- almost every day- and with some weeks ago since it was the last time connected to the ctek, the voltage readings when driving have gone up. I now get approx. lows of 12.3 and highs up to 13.9, ie. when coasting.
These newer XKs clearly seem to have an intelligent charging management which is why I probably got the low voltage before, just some days after having fully charged the battery with ctek.
BR
ter
These newer XKs clearly seem to have an intelligent charging management which is why I probably got the low voltage before, just some days after having fully charged the battery with ctek.
BR
ter
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