Car was dead after being gone 1 week

[CCipolaro]

2019 Ford Fusion Hybrid would not start after being gone a week. Seems soon to have a dead battery. What is my next step in terms of getting it replaced and is there some sort of warranty on future batteries if this is the case. I've read that the Titanium model has battery problems   Wish I would have seen this before buying....  Any suggestions on fixing this issue?

[2014FordFusionSE]

Hello,

 

The battery life depends on the weather (specifically heat) in your area. If it's a 2019, assuming it's the OEM battery, there's a chance that it may need to be replaced since it's 4 years old.

You can get it tested at a local auto store to be sure.

The battery is in the trunk and can be replaced by an auto shop or if you're good at DIY, you can do it yourself. (I replaced mine on my own)

 

My SE's battery lasted 7 years because the weather in CA is pretty good, and the car is garaged when not driven.

Titanium models have more bells and whistles so I'm not surprised if there's more battery drain.

 

There are batteries that have a 3-year replacement warranty and a 5-year pro-rated warranty.

If a battery lasts 4 years, it's fine. Anything beyond that is a bonus.
 

Edited December 8, 2023 by 2014FordFusionSE

[MeeLee]

My 2019 model started getting random error codes. Figured from the forum that it was the 12V battery. 11.8V at no load, drop down to 11.2V under load.

 

I replaced it with a 12V 50Ah Lithium battery.

 

Initially I tried a 12V 20A peak (10A continuous) UPS battery, but it was unable to start the car.

The vehicle draws over 200W at startup, and the UPS battery couldn't pull the load. So I swapped it for a 50Ah battery with success.

 

Battery problems followed though, as the 12V battery BMS would shut down at 14.4V charge voltage.

It's output voltage at between 13.4 and 13.8V also was much higher than a standard 12V, and I found that the cabin lights were too bright with this new battery.

 

So I bought myself 2x welder diodes (1600V 100+ amps), and soldered them between the battery terminal (one for charging, another for using) and the charging cable. Now the 14.4V charging voltage drops down to 13.85V to the battery, and the ~13.35V low SOC voltage puts out 12.8V to the car. The perfect voltage.

 

Lastly, lithium batteries are made in China. Which means, they're overrated. Charging them at a lower voltage will hopefully make them last longer. So far it's been nearly 2 years working fine. You don't want lithium batteries to be charged at 100% anyway. The weight of the lithium battery is about the same as a new shoebox with shoes inside. Very light.