Replace 12V battery in 2017-2018 FFE

[campfamily]

Understood where the 12V battery is. But if your jump starter is in the trunk, and you can't open the hatch, the only way to get to it is through the passenger compartment. Have you tried to do that? You may not even be able to get to that part of the trunk with the hatch down, particularly if you have your "coffin" in the lower area.

I don't own my FFE any more, and my son has the RS in Alabama, so can't check to see how hard it is to get into the trunk area from the passenger compartment. But I'm guessing it isn't easy.

[electrons]

campfamily, True, if 12v is completely gone, the hatch release is disabled.
Fortunately the rear seats fold down to let somebody reach into the hatchback area. I tried it and its not too difficult. Could be for some though.

[OwGr33]

I don't understand. Do you need to replace the accumulator? Or do you have problems with it? If you are not an expert, I advise you not to climb over the trunk to replace the battery. You may not be able to properly disconnect it and connect a new one in a narrow space. The main thing is not to break anything there... It's better to contact a specialist, . The problem was that I bought an old car, apparently, the battery was not new at all and quickly stopped working. I wanted to fix it, but nothing came of it and I just replaced it with a new one.

[bkeil84]

My battery just failed. I didn't use it for a couple of days and I had to jump it as it was only 9 volts. I drove it for an hour and then when I went to use it 4 hours later, it was really low again. Why does the battery only last just over 3 years in a vehicle that has a large start load? I think it I'd due to the dc to DC converter putting out 14.35 volts. 12 volt FLA batteries want a float around 14.0 volts. Just for an experiment, I had a couple of 10 amp lifepo4 battery packs that I wired in. This has worked fine for a couple of days now, so I ordered 8x 8 amp cells and a balancer. This should give me a 16 ampmhr battery and should be fine. It also weighs about 30 pounds less and takes up half the space in the battery box. This battery is also fine at a 14.35 volt charge having a maximum of 14.6 charge. I am thinking this battery will last me 10 years or so for under $100. I wonder why you don't see more installations like this in electric and hybrid cars that do not need the big starting power. I have seen that Tesla is just now starting to use this type of 12 volt battery in their cars now.

[Heima]

Actually, that is a 15V battery Tesla is using.

[scmike22+]

Yep, just checked Costco, 3 year 26R is $89. If you want to check other sites, sometimes they want a vehicle and not a battery size. Use a 2000 Chevy Metro 4 cylinder LSI 1.3 engine.

And since the battery case is probably the same as for 2012-2016 FFEs, the 26R will probably work for those years as well.

Thanks for the tip...The same battery is $110 at Costco as of 8/3/23.. it is a wet Lead acid battery..we'll see how long it lasts... and hopefully the terminals don't corrode.. I coated them with battery corrosion purple spray..