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Has anyone replaced their 12V battery yet?
- Thread starter Garlan Garner
- Start date
I haven’t had a need yet. I just thought I’d feel pretty silly if my battery did die and my jump pack wasn’t in the car. This one is pretty small but I’ve jumped 6 cylinder SUVs from it in the past so it’s plenty capable.
Mine went out on my X at 2 yrs / 20k miles. Mobile service came to my house and replaced it the next day under warranty.
smatthew
Active Member
On a 12V battery, 12V means it's dead, or close to it. A fully charged 12v battery is like 12.6-13.5 volts at rest, or anywhere from 13.5-16.5 during charging depending on charge rate.
Mine died while my wife and I were returning from a trip. Sirius was just over 1 yr old with 30,000 miles. We were about 120 miles from home late at night on an interstate highway. My wife said "It has a 12V battery? Where is it?" I replied, I don't know. She said "Your an electrical engineer. You should know where the battery is in your car!" I slowed down and moved to the rightmost lane for maximum range. I knew the HV drive battery was good but I also knew that the bad 12V battery would put an extra drain on it . I was expecting to arrive home with 15% remaining, but I was concerned that an increased load might strand us or when we got down to 20% things might start going into low power states or the headlights might go out. It was a nerve racking 2 1/2 hours. We made it home and took him to the SC next day. They replaced the 12V battery under warranty in just a few minutes. And yes now I know where the 12V battery is and how to put in the spare that fits neatly into that small pocket on the left side of the trunk.
I replaced my battery with an Ohmmu Lithium battery when i picked up the car. Easy change out and video on the site explains how. Takes about 10 minutes. New battery is much lighter and much higher cycle life.
Tesla replaced the 12v in my car but that was when they were upgrading the car to HW3. They left it overnight with the HV battery disconnected and it killed the 12v, so they just replaced it. It just showed up as a line item on the report.
So I got a nice new 12v as well as the FSD computer, nice
So I got a nice new 12v as well as the FSD computer, nice
Kcharwood
Member
Got mine replaced yesterday. Delivered March 2018. 33k miles.
Tesla covered it under warranty.
Tesla covered it under warranty.
.... In other words, same condition as everyone else, except with $500 less in your pocket.
After warranty expiration, I guess I understand replacing the battery - still think it's too expensive for what it is, but OK. Before that though, why?
Reliability, weight, longevity, not getting caught with my pants down with some faulty lead acid battery. Will check back in again at 1.5 years (Oct)...... Why not add the best component in a sweet ride.
Fred
Did you forget to mention the audio (bass) improvement, or didn't you notice?
Jedi2155
Model 3 has Arrived.
Great post from Smatthew on explaining the role of the 12v battery in our cars with big traction batteries. More Tesla really wanted to remove the 12v subsystem in the Model Y but decided to focus on bringing out to market faster than trying to integrate new technologies/ideas.
A lot of the early 12v battery deaths were a result of the car sitting on a lot not being charged in the early 2017-2018 period before Tesla figured out all the Phantom Drain issues. So it resulted in draining the 12v pack while the cars were waiting to be sold. A thing about Lead Acid batteries is that going less than <30-40% is MUCH worse than it is on a lithium battery or nickel based battery. Fully discharging a lead acid battery will result in permanent damage and significantly reduced capacity so thats why some Model 3 owners had issues with the 12v pack early in the life.
Once Tesla solved the phantom drain and supply issues, the problem generally disappeared but I suspect a lot of people may have 12v battery issues in the June to October 2018 supply glut period where cars were having trouble being delivered to customers in a timely manner.
Now more important on the cycling issue with the battery, here was an in-depth blog that describe the stress of what Tesla does to our deep-cycle AGM lead acid packs.
A lot of the early 12v battery deaths were a result of the car sitting on a lot not being charged in the early 2017-2018 period before Tesla figured out all the Phantom Drain issues. So it resulted in draining the 12v pack while the cars were waiting to be sold. A thing about Lead Acid batteries is that going less than <30-40% is MUCH worse than it is on a lithium battery or nickel based battery. Fully discharging a lead acid battery will result in permanent damage and significantly reduced capacity so thats why some Model 3 owners had issues with the 12v pack early in the life.
Once Tesla solved the phantom drain and supply issues, the problem generally disappeared but I suspect a lot of people may have 12v battery issues in the June to October 2018 supply glut period where cars were having trouble being delivered to customers in a timely manner.
Now more important on the cycling issue with the battery, here was an in-depth blog that describe the stress of what Tesla does to our deep-cycle AGM lead acid packs.
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