12 V battery replacement

[old man's hybrid]

I have a 2019 Fusion Hybrid, when should I expect to replace the original 12V battery,?  I have already replaced the factory tires at 35K miles. I will appreciate any input...

 

[mwr]

My 2015 FFH will be eight years old this October, has 95K miles, and still has the original 12V battery.

[2014FordFusionSE]

19 hours ago, mwr said:

My 2015 FFH will be eight years old this October, has 95K miles, and still has the original 12V battery.

That's really good. I would replace it preemptively if I were you.

That way, you won't have any surprises and you're good for another 8 years.

[mwr]

36 minutes ago, 2014FordFusionSE said:

That's really good. I would replace it preemptively if I were you.

That way, you won't have any surprises and you're good for another 8 years.

I'm sure you're right, but it's become sort of a challenge to see how long it will last ?

[MeeLee]

On 8/14/2022 at 3:31 PM, mwr said:

I'm sure you're right, but it's become sort of a challenge to see how long it will last ?

So far mine is at 105k miles (granted it's only 3 years old).

The good thing is battery checks are free with ford until the end of the year (though our ford dealer has a few day wait time before the first appointment is available).

 

The high voltage battery in my case will go bad before the 12v battery. It currently has about 50% range left.

[Sky14FFH]

On 8/13/2022 at 6:40 PM, old man's hybrid said:

I have a 2019 Fusion Hybrid, when should I expect to replace the original 12V battery,?  I have already replaced the factory tires at 35K miles. I will appreciate any input...

 

The NOCO 5 battery charger on Black Friday sale will save you a LOT OF MONEY and hassle.  $50.  It restored two of my batteries. One is an 11 year old Optima AGM and the other the 8 year old OEM in the FHF. I've been trying to get an original 22 year old lead acid to recharge with it too but I'm going to have to do some chemistry experiments to clean it out and add new battery acid. 
https://www.amazon.com/NOCO-GENIUS5-Fully-Automatic-Temperature-Compensation/dp/B07W8KJH44/ref=sr_1_5?crid=2JG3C8KN9FKMV&keywords=noco+genius+5&qid=1669445147&sprefix=noco+%2Caps%2C449&sr=8-5

[MeeLee]

On 11/26/2022 at 1:48 AM, Sky14FFH said:

The NOCO 5 battery charger on Black Friday sale will save you a LOT OF MONEY and hassle.  $50.  It restored two of my batteries. One is an 11 year old Optima AGM and the other the 8 year old OEM in the FHF. I've been trying to get an original 22 year old lead acid to recharge with it too but I'm going to have to do some chemistry experiments to clean it out and add new battery acid. 
https://www.amazon.com/NOCO-GENIUS5-Fully-Automatic-Temperature-Compensation/dp/B07W8KJH44/ref=sr_1_5?crid=2JG3C8KN9FKMV&keywords=noco+genius+5&qid=1669445147&sprefix=noco+%2Caps%2C449&sr=8-5

I've replaced the lead acid with a 12v lithium.

Since then, my mpg went up from 42 to 45mpg.

Did a 300 mile ride yesterday, with an average of 53mpg (not accounting for the 4% taller tires, which make the actual numbers closer to 55.5mpg).

 

Did a recent smaller trip, no highway, and got 60mpg average readout. Used all the tricks in the book (accelerate in normal mode until 10-15mph over the limit, then coast on electric using only 1 bar (10hp) to slowly decrease speed to 45mph, and also coast in neutral for stoplights far away)...

 

The 12v lithium isn't charged up by the car, becasue the bms cuts off when the charge voltage increases above 14.7V.

 

Instead I've bought this $25 10A charger:

https://www.amazon.com/dp/B09DCK7XG1

 

I did the math, charging the lithium from empty costs me around $25-33ct. The gains in mpg are 3+ MPG(and still rising).

 

I only have to charge it about every other week. Since I do uber part time, that means I save roughly 100 miles on gas out of 1500 miles, or ~$20 every 2 weeks.