Everyday, I go to pick up my children from school, get in line and turn my vehicle off. I push the button the the radio control to turn it back on and roll down my windows. I have been doing this in my 2010 RR Supercharged for over a month now.

Today, a message popped up on my NAV system/radio that said something like "powering A/V down loss of battery charge." I immediately put my foot on the brake and push the start button. NOTHING. No noise, NOTHING.

I walk into the school office and find someone with jumper cables. It takes a good minute for my battery to pull a charge off of his battery and finally turn over and start. I continue driving, running errands without turning the car off and I leave it on in the driveway for about 15 more minutes. Tonight while watching my son's football practice with JUST the windows down--NO radio on--I get the same "powering down battery charge" message on the NAV screen. I immediately put my foot on the brake and push the button. Thank goodness, it cranks. Barely.

I'm going to get the battery charge tested tomorrow, but wanted to know why on earth the message would pop up with the car off and just the windows down. Any ideas? thanks in advance!

 

Go get the battery and charging system tested. My RR had been doing this, it runs fine when started, but the battery seemed like it was never being charged. It turned out to be my voltage regulator. It was diagnosed at autozone for free, they put the tester on the car, and it went to work. Within a few minutes it found an issue.

 

Turns out the charging system is fine but the battery is toast. I can get the battery locally without having to visit a dealer and have it installed by a friend who works on foreign cars. The battery specialist posed the question of whether or not when you disconnect the battery to replace it would it reset all the electrical systems and mess up the car? The owner's manual said it would reset some of them but not to the point of effecting the operation of the vehicle.

Has anyone ever replaced a battery yourself and had electrical problems?

 

When you buy a replacement battery, buy the best you can per CCA ratings. As you have already seen, your truck with all it's computers eats batterys so get one with a 1000 CCA rating or as close as you can.

 

Thank you DiscoMike!

 

FWIW it would best to not run the radio with the engine off,
this will draw down the battery rather quickly,
the radio system has lots of other parts that also run when its on including the nav the amps and the Bass power booster and dash system.

Remember when you were in the dealer looking at the new trucks it had a battery charger connected to it so to run the various systems with the engine not running.
I was doing some testing on my 05 and it took about 15 mins and the radio went dead, this with the engine off,
I put the battery back on charge for 3 hours and now its good to go.
Note to self dont run the radio with the engine off, the battery will quickly lose power

Maybe you could use an Ipod and leave the key off

 

I guess I figured a car that cost as much as some houses could run a radio with the ignition off without battery significant battery drain. I never had issues with other vehicles--but those don't compare to a RR! I listen to college football talk radio when I am in the carpool line so my iPod/iPhone/iPad does me no good. I suppose I will start reading instead! haha!

 

You have lots of power that is being used when you turn on the accessory position. It drains the vehicle. Very common on all vehicles especially with nav and radio. Why you would run the radio with the vehicle off is odd especially that the vehicle requires lots of power. And yes you require at least a 900 CC battery, once you disconnect the battery u have to perform the battery reset procedure or nothing will work. Plus you get a 4year 50000 mile warrantee on the battery. Go to the dealer if its in warrantee and get it replaced or pay for one that would otherwise be free. Plus, if you do replace it with something else its a trip to the dealer and you will pay. They will see the new battery and realize what you did. If you let someone else work on the car and they don't have the ability to do stuff, we charge, big time. Sorry but customers that go to guys that don't know our cars that attempt to work on them pay for the lack of information and training.

 

We actually called the dealership--which is 2.5 hours away--and spoke with a service technician. He was super nice and told us exactly what battery to get. Followed the directions in the owner' manual and the whole experience took 10 minutes max. Everything works fine except the auto-up feature for the power windows. Auto-down is fine, but auto-up isn't working. I'm not super concerned about that and not even sure if the battery change is what caused it. I had to reset the date and time and change the temp from Celsius to Fahrenheit. NAV and radio were fine. All Sirius radio setting were still programmed. If the dealer didn't want people replacing their own batteries, why do they give them directions on how to do it in the owner's manual? They should have just put "Take the Vehicle to the Dealer" instead.

As far as getting someone besides the dealership to do work on the car--unless a fairy drops a money tree in the backyard, I'll let my foreign car aficionado mechanic pitch in when necessary. Dealership quoted me $1800 for brake pads that I can buy from an online supplier and have installed for between $200-400. He works on Porsche, Aston Martin, BMW, Land Rover, etc. I won't ever pay $600 for a glorified oil change again.

 

I hope your guy has spent the money on updated equipment to fix your vehicle. Trust me it will cost somewhere along the lines of 10000 for a glorified reader to read the codes for all those vehicles. And that includes all the others. Plus codes don't mean squat if you don't know the system. Not to mention the special tools to work on the engine. Direct injection isn't cheap and very complicated. But hey i am sure you don't care you will just get another rover when you can't figure out why he can't fix your vehicle. Do your really think he has any idea about anything on your truck except to put on brake pads and oil and a battery? Those guys learn off of your truck at your time and expense. That is how foreign guys work. If they specialize in european cars then they specialize in all makes and know squat about the new ones. They ask us techs for help while they make the money. All because the client is cheap and doesn't want to pay for expertise. I can say I fix BMWs too, just cause you got a code reader doesn't make you an expert. The reason the dealers charge so much for oil changes is because they think that rich customers deserve to take it up the ***. Meanwhile you go to a domestic dealer and pay about half as much for parts and labor. Meanwhile the guys are getting paid the same and the building is the same. The luxury guys think that just because you are rich you deserve to take it. Reality is most of their profits come from return business and rich people have a higher thresh hold for getting gouged. Domestic customers not so much. Trust me take it to a domestic dealer and they will use the same parts and have similar equipment and spend lots less. Regardless of how much the car costs. They understand the thresh hold for poorer clients isn't as high so the bar is set low. That is why you see the 25 dollar oil change and the 20 dollar rotate. These dealers sell more cars and pump out a higher volume because they are cheaper. Meanwhile the luxury guys assume the opposite and expect the profits from the gouging. Honestly, the luxury car guys could make so much more money by adjusting their profits and increasing there market share by working on imports and domestics and charging the same. So if you want an oil change with synthetic regardless of vehicle make it the same regardless of manufacturer. Same with breaks, sure parts aren't cheaper for a luxury car but you don't have to gouge them. Make the stuff you do more often a set rate like five percent over cost regardless of manufacturer. That way you can guarantee that everyone is treated fairly regardless of manufacturer.