Unlike some BMW's, and some year Range Rovers, the battery will not have to be coded or reset. Just install new fresh battery. The trunk open should not kill a healthy battery. The light will go out after a set time. Your battery could have been at the end of it's life. Make sure you have the correct size battery. The X350's draw some huge current.

 

Hi Cbrooen,

Also note that the charging voltages in the X350-X358 are higher than in most cars, which can shorten the life of most lead-acid batteries, including AGMs. The original batteries used silver-calcium technology and were made by Varta. Typically they lasted 8 years or more, but are not available in the U.S., if anywhere. If you live in a region where these are still available, a Varta silver-calcium would be your best option.

Other batteries known to tolerate the X350's higher voltages are the Bosch Premium non-AGM (probably made by Varta) and the Exide Global Extreme/NASCAR Extreme.

So far, we have not identified any AGM batteries that can tolerate the higher charging rates without suffering reduced life.

Cheers,

Don

 

+1 on the Exide Global Extreme/NASCAR Extreme. It has been serving me well in Maine. Temps down to -5F. It's also cheap at Home Depot.
When the temps drop down really low, I plug in my c-tech, to ease the strain in the morning, also I have a 5 minute drive to work (not a lot of recharge time)
Mark

 

 

Great News! CTEK arrived yesterday in Florida. Today battery was jumped and CTEK now attached and is showing that it is charging. I great appreciate all the advice especially since the border is still closed and I was unable to get there and do the work myself. It looks like earliest the border will open up will be in the next 3-4 weeks, but the good news is the Cat will be ready to go when I get down there. On arrival, I plan to check to see if the battery has enough juice or whether it should be replaced. It is now going on 7 years!

Murphman

 

Is there a date of manufacture on the original OEM (Varta silver-calcium) battery? I tried to look today but couldn't find anything. I think mine might be original but is starting to show its age..

 

I realise this is an older thread but I have noticed a couple of minor electrical gremlins in my '06 X350. Parking sensors in the rear not working, although the individual sensors test ok, lousy FM reception, air suspension fault !!... I tested with a multimeter before starting, when cold and I was getting 11.9 volts which went to 13.3 upon start so the alternator appears ok.

My question ?...is 11.9 low enough to cause me problems of this nature....

 

A good charged battery at rest should be ~12.6v. It is said that 12.2v is half-charged. Might depend a bit on the chemistry (calcium, AGM etc) but not much.

The charging system should do ~14.5v for exactly 5mins, then drop back to ~13.5v. This assumes a normally charged battery i.e. if the battery was flat it might not reach 14.5v in time.

11.9v is poor. Goodness knows what it drops to with the starter. Of course, check the multimeter on something else.

It's not clear if your battery is stuffed or needs charging. But it would take hours to charge a flat battery with the engine, use a battery charger.

 

Hi Colm O,

I agree with Chris that your battery is essentially depleted, and the voltage is probably sagging well below 11 volts while cranking the engine, which can cause all manner of electrical gremlins in a Jaguar. Here's a state-of-charge chart:



Bear in mind that static state-of-charge is only one measure of a battery's health. Other important measurements include the Cranking Amps, Cold Cranking Amps, Amp Hours, Reserve Capacity, and capacity under load. My Midtronics battery analyzer can test for the actual cranking amps a battery can deliver versus its rated capacity, and can also test the alternator and voltage regulator output and the starter draw while cranking.

The X350 charging system is somewhat complex and takes into account the temperature of various components and the battery voltage. The charging strategy was designed for the original Varta Silver-Calcium wet lead-acid batteries. The maximum charging voltage is 15.3 volts, which is higher than most conventional wet lead-acid and AGM batteries tolerate long term. Here's the description from the Technical Introduction:



Cheers,

Don

 

Chris and Don B....... many thanks for your valuable input. A new battery is on the agenda for saturday morning..... Thanks again guys.