Looking at the wiring it appears that if you want to do a battery hot swap all you would need to do is attach the smart charger to the battery jumper post in the left side of the boot . The trick is to cover or tape the positive lead on the battery so you don't short it out during the change. Just a suggestion

 

Thanks Jagtoes. I was thinking the same thing originally. However I have read that it is not a good idea to connect a smart charger while the battery is disconnected due to voltage fluctuations which may harm the car's electronics.

 

I'll have to look into that but the option is to just use a dumb charger in the 3-5 amp range. It will look like another battery.

 

From Ctek site
"The MULTI US 7002 (Part No. 56-353) is the ideal battery charger for your caravan, car and boat. The battery charger is well suited for all-year use. Thanks to its SUPPLY mode the battery charger provides power even without a battery. The SUPPLY mode is indispensable when changing the battery as you avoid losing complicated program settings."

 

I wonder if its specific to that model or if this will be applicable to the Multi US 4.3 version or others as well. I personally own the 4.3.

 

The Multi US 4.3 does not have a Supply mode.

 

I didn’t buy the CTEK. I bought the Schumacher 3 amp from Autozone, about $50. It’s been working well. It comes with three connectors: the eyelets, alligator clamps, and a cigarette lighter connection. I don’t foresee using the cigarette lighter connection, but the alligator clamps are useful for moving the charger around if other cars need it. I bought a couple of wing nuts from Ace Hardware to mount the eyelets on the Jaguar battery connectors. The size is 6M-1.0. There is a little rubber drain grommet at the bottom, back of the trunk. The cable won’t go through it with the grommet in, but it comes out easily and the cable will fit through. I routed the cable to the left under the trim, and then back out at a point where it won’t get pinched, then down through the hole at the bottom of the trunk. That way, I don’t have to close the trunk on the cable, not that it’s that big of a problem. I’ve gotten to where I can connect and disconnect the cable by feel, so I just have to kneel down to connect/disconnect.


Cord coming off battery

Cord going to bottom of trunk

Underneath trunk

 

Nicely done! I had to go to your Public Profile to learn that you have a 2007 XK. I did that because you attached your maintainer's negative (ground) pigtail directly to the negative battery terminal, which is OK for the 4.2L models but incorrect on the 5.0L models that have the Battery Monitoring Module.

The cigarette lighter connector that came with your maintainer won't work on the X150 because that socket is on a switched circuit. That means that socket is "hot" - has power - only when the ignition switch is "ON". When you shut off the engine and Convenience Mode automatically shuts down, the cigarette lighter circuit is OFF and has no power. You may be fooled into thinking that it works because when you open the door it activates Convenience Mode and that powers up the cigarette lighter circuit even with the engine not running. But when you shut the door, Convenience Mode will eventually shut off that circuit and whatever it plugged into that circuit won't work.

You should add a signature block that includes your X150 year and model and location to make it easier to reply to your questions.

 

That´s EXACTLY what I think and already do!

Hermann