sajack

What kind so battery life can I expect with my 3 year-old, 45,000 mile LS500?
AGM battery on my 2018 F150 surprisingly only lasted 3 years. Ford service advisor told me that was about average. Battery life on my Miatas with AGM located in trunk was about 8 years.
Am I going to wake up to a dead battery one morning with no warning?

BillUK

Depends on how the battery is treated. Batteries that get flattened lose their life quicker, whilst those that never get drained below 50% will last longer. I would expect around 5 years and hope for more. If you're worried about waking up to a dead one then get one of those battery jump starters. Worth having one anyway, just in case.

Fhobbs

I just changed my battery first time on my 2018 with 90k miles. No issues at all prior. I didn’t even know I needed it changed but it tested marginal on 90k service at the dealer.

PGA71

iTrader: (3)

My GS350 factory battery lasted 7 years and was garaged.

With your environmentally controlled garage, I would not be surprised if it lasted you 8-10 years.

mikemu30

Wow - I just replaced the battery on my ES at five years old. No sign of weakness but replaced as preventative measure.

bigblack06

iTrader: (20)

I still have my original battery from when I got the car and I have about 59K on the odometer, and this is from 2018. I have had mine on a trickle charge though which might help it.

sajack

I have used Battery Tender Junior on previous cars that weren’t driven daily with good results. The battery being located in the trunk of the LS500 should help extend its life. If there was a way to install a quick connect/disconnect for the battery tender it would really help.

BillUK

I've had batteries last 8-10 years, and some fail at less than 3. As a result I keep a portable jump starter in the car and don't give the battery, or it's age, a second thought. If ever need the jump starter for anything other than something dumb, like leaving the lights on, or if I get any signs that it's significantly weakened, then I'll change it. Otherwise I leave it be.