Battery health

[Bluejmc2005]

Hi all,

I have recently bought a 2010 Jaguar XF 3.0 DV6

I think the battery is the original.

yesterday, after an hour drive, it read at the terminal 12.45. I left it for an hour, and it read 12.15.

I trickle charged it for 12 hours, and it rose to 12.26

Does the battery need changing would you say? It starts fine and o issues, other than the air-con not working which i guess xould be battery related.

any ideas/thoughts appreciated.

Jason

(posted in general gassing and jag sub-forum)

Edited by Bluejmc2005 on Thursday 11th October 10:01

Edited by Bluejmc2005 on Thursday 11th October 10:02

[ToothbrushMan]

seems like it. either the battery is U/S or something is draining it at considerable rate of knots in an hour (like the boot light or under bonnet light with faulty off switches). you are close to a non start voltage there so after a couple of hours youd be into 11v or even 10v territory at the same loss of volts per hour so a non start.

presume a 2018 is under warranty so drop it off for a battery and alternator check and for drainage elsewhere.

[Bluejmc2005]

ToothbrushMan said:

seems like it. either the battery is U/S or something is draining it at considerable rate of knots in an hour (like the boot light or under bonnet light with faulty off switches). you are close to a non start voltage there so after a couple of hours youd be into 11v or even 10v territory at the same loss of volts per hour so a non start.

presume a 2018 is under warranty so drop it off for a battery and alternator check and for drainage elsewhere.

sorry that was a typo - its a 2010, 8 years old

[E-bmw]

Bluejmc2005 said:

yesterday, after an hour drive, it read at the terminal 12.45. I left it for an hour, and it read 12.15.

I trickle charged it for 12 hours, and it rose to 12.26

Does the battery need changing would you say?

What does it measure with a high tickover at the battery terminals?

Should get around 14.odd volts with the engine running at a couple of thousand revs.

Also, don't forget that your 12 volt battery is actually 6 x 2.1 volt batteries in parallel so a fully charged good battery should read 12.6 volts and every 0.1 volt drop is around 20% of a full charge.

[Mignon]

Bluejmc2005 said:

I trickle charged it for 12 hours, and it rose to 12.26

It's toast.

[slk 32]

Most batteries on cars I've had go after 7 - 8 years. Best to replace it now at your convenience rather than getting stuck at the roadside during the winter

[lyonspride]

Don't f**k with car batteries, if it's suspect just change it, new one can obtained from an online store for half the halfrauds price.

When you've had one explode, you'll understand.