So never had this happen before in 4 years ownership of a car. Used the car this morning, was perfectly fine parked in the garage came back 4 hours later battery was completely dead not a sign of any life. No lights on left. I did however leave the keys inside the car, could this have caused it?

 

Absolutely! Your car remained in Convenience Mode, which is no different than leaving the door open. The computers never went to sleep and kept drawing power.

To minimize battery drain:
1. Never leave your Smartkey in your car.
2. Always lock your car, even when parked in your garage.
3. Use a battery maintainer if it's not your daily driver. The CTEK brand is highly recommended.

 

See, I’m not buying that. The rest is all good advice, but from my experience, fob in the car or door open, it still shuts down in half an hour. (Which was a pain when trying to use the interior lights when working in the car.)

 

I experimented with my '07 XKR a few years ago and, yes, it did eventually drop out of convenience mode when the fob was left in the car.

 

I have left my keys in the console for days ,no effect

 

May be a combination of an underlying fault which with the key causes a big drain.

 

I’ve been looking at the CTEK battery tenders you stated re highly recommended but how do I know which one there are so many.... help, please. Trying to get my girl,up to speed. I need a lot of things for her.

Margo

 

Margo,

I have the CTEK MUS4.3 and recommend it. I bought it on Amazon, but the price has really gone up since I bought it.

The older model CTEK 3300 is less expensive and should work fine. That's what Jaguar dealers sell as an accessory, and because it has the Jaguar name and logo it costs more than the identical item on Amazon (without the Jaguar name and logo).

Technically speaking, these devices are battery maintainers, not chargers. They can keep a good battery fully charged, but they can't rapidly charge a dead battery.

Stuart

 

There is a TSB that might pertain to your issue. Not sure of all your circumstances but worth looking into - see attached

 

A big THANKS for this Technical Service Bulletin. Note that it was issued on 11/16/2010 and applies to X150 models from VIN B32753 to VIN B42709.

My 2009 XKR's VIN is B28977 and it was manufactured in April 2008. That's a difference of 3,776 (32753 - 28977), which appears to account for the balance of the 2009 model year production. Therefore, it appears that this TSB applies to 2010 and 2011 5.0L models with the Battery Monitoring System manufactured before 11/16/2010.

 

Are you certain that its not just the battery has exceeded its expected life? Or have you sourced the root of the drain?
FWIW, I replace batteries about every 5 years. I don't use any battery maintenance tooling. I travel very frequently for business and sometimes 3 weeks at a time... my vehicles just start up when I'm ready to use them.

Cheers

 

Or save yourself some money and get one that's equally reliable and doesn't include the up charge for marketing:

 

Or get one with real power, 5 times the power. For the same money! So you dont have to wait overnight.
Charge in an hour and be done. Others are just tickle chargers.

 

Better read the 1-Star reviews on Amazon before you buy this battery charger.

Q&C, you stated: "Others are just tickle chargers." (Emphasis mine.) Imagine the fun with one of those, especially on the "Tickled Pink" setting!

 

FWIW, also has a lot of 1-star ratings on Amazon. That tends to be the case with cheap battery maintainers.

 

Guys so my battery is less than one year old AGM so not the issue.
Thanks for the technical article as that might be related to my drain, need to troubleshoot..
Speaking of battery maintainers/ charger ,I have ctek 7500 but not powerfully enough for my ECU Reflashes so I have bought Clore Automotive PL2320 6/12V... More than double the power and seems to do everything that ctek does for half the price ,I paid $67,. and it has 4.5 star reviews

 

Of the three CTEK chargers on Amazon, one has 4% 1-star, one has 7% 1-star, and the third has 8% 1-star, just as that Schumaker has 8% 1-star. Seems quite similar to me. Evidently CTEK is also "cheap battery maintainer" going by that criteria.

 

I never follow sheep. Bought mine 5 years ago because I needed something immediately, thought I would throw it away and get a ctek. Never happened, and this gets used on 2 other cars never driven, so its used 3 times as much as a ctek.
As a double bonus to charging 3 cars in one evening, due to the 15amp charge rate, it works like a jump starter with a 30min latency.

Those 1 star reviews are from 1 star intellects, read the first one, he was trying to desulphate a battery, which it would not do automatically. (as a safety precaution) its not going to put 15 amps at 12v into a 6v battery. So allz you have to do is cycle it a few times, and it will desulphate the daylights out of a battery.

BTW the reason I never bought a ctek is, they too make a 15amp charger, they want $200 for it. what a rip off.

 

Yeah I dont understand what all the salivation about a ctek charger is all about, its not even smart enough to tell you what the battery voltage is, cause that would require an lcd display and cost another $100.

p.s. you have a bad battery. Get wise, nothing on that car other than the stereo and headlights can drain a good battery in 4 hours to total flat.
Batteries can die in 3 months, if they were already half dead on the shelf.

 

Before completely ruling out the battery, it might be wise to charge it (if you've not done that already). If you can't charge it, then you found the issue. If you can charge it, then putting a clamp amperage meter on one of the battery cables will tell you if (and if so, how much) current is being drawn. If little to none, then it is the battery. But if it is drawing a lot, then you have confirmed it's in the car somewhere and you could start pulling fuses to try and narrow it down.

All the best and good luck!