booboo37

I just bought this right before winter..............i let it sit all winter here in Michigan with the battery tender on all winter.......Battery Tender alway had a green light on all winter............About 4 months later.......Today i tried to pop the hatch and nothing, then i tried the door locks and nothing.........got the key out and popped the hatch and the 2 lights came on bright in the trunk...............battery checks 12,2 volts................So whats the trick to getting everything working ??

Travlee

I would change battery

Texasthunder

Was the remote far away from the car for the 4 months? Check battery in the remote and if it is good you may have to do a relearn on the remote.

Wlkinser

Replace the battery.. These cars eat batteries and act crazy when battery is weak.. Do this first and rule out the battery before you go any further.

booboo37

Ya, looks to be the original battery........Is there a trick to getting the battery out ?? Theres no handle to lift it up......i will take a closer look in the morning...

Travlee

Busted knuckles is the trick....it isn't fun. Look on Amazon for battery lifting strap

Wlkinser

They are really tough if there is no handle.. Some people say you can use 2 vice grips, but I cheat and go to AUTOZONE. They will replace for no charge and the new batteries have a built in handle. If it's the original I will almost guarantee that's your problem.. Been there many times. Good luck!

GettnBetter

I went with an Odyssey extreme battery. It's design is best in class

tommyc6z06

no way is that the origunal battery from 08.
Buy or borrow a cheap battery lifting strap from auto parts store (it slips over the posts). If you buy a battery from them, the store may even lend you one.
Most new batteries have a built in handle, so replacement will be easy.

Red Greene

Why could'nt it be the original battery ? I'm still using my original battery in my GS from 2012 and it is still going strong. I want to see how long it will last . 😎

tommyc6z06

I bought my 08Z in 2018. The battery was a Delco. I thought it was original...but I found out it had already been changed 3x for PO who also happens to be owner of several GM dealerships. Once in 2010, 2013, and 2016 batteries...3 batteries over 8 years. It had always been kept on a float charge.
I bought a new battery in 2018 (not OEM) because the one from 2016 couldn't hold a charge. I kept it on float charge whenever unused more than a few day, but had to change it in summer of 2020.
I'm curious what this most recent one will be like when I wake the car from hibernation this weekend. Yes, its on float charge and my booster pack is ready, but this time I disconnected the battery....in case that somehow helps.
I've never owned a vehicle that is harder on batteries.
Especially one that isn't subjected to winter, etc. And my experience is consistent with what I'm reading here on the forum from other owners

I think it would be a miracle if the OP's battery has survived 14 years.

Having said that, the battery in my 2010 X3 beater is still the original and had no problem cranking at -35 this past winter. I'm astounded.
The one in my 09 Cayenne S was changed in 2015 and again last summer, 21...which i feel is 'normal' and consistent with previous cars.

dmuellenberg

I can't believe no one has suggested that it may be the battery in the fob that is dead. That would be the easiest and cheapest thing to try first. If changing the fob battery doesn't work, then it is definitely the car battery. Never heard of a fob needing to be reprogrammed, only if you get a brand new fob, that would need to be programmed. As far as removing the battery, if you have a couple of vice grips, that works good, just clamp one on each terminal and lift it out. Some people have also used duct tape to make a handle and attach it to each side of the battery.

Pb82 Ronin

Super easy to just move the trunk carpet all the way off of the battery and then lift it out. Adds 5 minutes to the process, but saves your knuckles and an awful lot of cursing.

grinder11

Disconnect the battery in a C5, and you'll have to reprogram the Fob! IDK about the C6.....

hmatt8892

Mine did the same thing after sitting for a while. To get the car to see the fob, I had to put it in the slot on the left side of the glove box to get the car to start. But I figured the fob battery was going dead when it wouldn’t lock or unlock the car. Replaced battery in fob and Good to go.

jayyyw

this

449er

Check out Amazon for a battery lifting strap otherwise you are in for a experience

Too-Fast

You need one of these...

booboo37

Ya, i went and bought one just like that and it worked great..........and i put in a new battery and everything is working now.............Thanks for all the help.......

booboo37

I'm thinking of unhooking the battery and not hooking up a tender...