12V battery timer reset

[Dgil1972]

Greetings,

 

I recently replaced the 12V battery in my 2015 SE myself. I have even more recently read that the battery timer may need to be reset in Accessory Mode. I have researched the instructions on how to do it with the high beams (5X) and brake pedal (3x). Is that necessary, or will the car eventually figure out that there's a new 12V? Any advice is appreciated, I don't want to go fooling around with hidden features and really jack things up.

 

Cheers!!

[2014FordFusionSE]

I replaced my Fusion's 12v a couple of years ago. I didn't have to do anything.

Seems to work fine after the replacement.

[MeeLee]

I replaced mine with a 50Ah lithium battery of similar physical size, and it's immediately recognized. The car just wants to see a minimum of 12v on the output. If the battery is lower than that (11.8V), and you turn the car on (14.4V on the charging cables), that voltage fluctuation (voltage jump when you start the car) sometimes causes software errors.

 

Through the use of a Bi-directional inline welding diode (~1200V 200A) with the positive terminal, the 14.4V charge voltage drops to 13.9V which is a better charge voltage for the battery, and the 13.35 no load battery terminal voltage drops to 12.85V to the car, both the sweet spot for charging and discharging. Some smaller lithium batteries may not charge properly on car terminals, hence you'll need a diode to lower the voltage. Maybe if you put a 100A battery the diode isn't necessary, however, those batteries are also much more expensive.

[billford]

On 8/14/2023 at 8:51 AM, Dgil1972 said:

Greetings,

 

I recently replaced the 12V battery in my 2015 SE myself. I have even more recently read that the battery timer may need to be reset in Accessory Mode. I have researched the instructions on how to do it with the high beams (5X) and brake pedal (3x). Is that necessary, or will the car eventually figure out that there's a new 12V? Any advice is appreciated, I don't want to go fooling around with hidden features and really jack things up.

 

Cheers!!

 

A battery monitor reset is supposed to be done with a scan tool. But people replace 12 volt batteries without doing a reset with no problems. 

The reset is done so the cars electrical system adjusts the charging rate due to battery age and state of charge.