Anyone replaced their 12v battery?

  • Thread starter Thread starter Yams
  • Start date Start date
  • Replies Replies 33
  • Views Views 4K
We had a momentary notification today "battery discharging while stopped"

Time for new 12v? Seems a little early for a 2021 car, but IDK.
 
polyphonic said:
We had a momentary notification today "battery discharging while stopped"

Time for new 12v? Seems a little early for a 2021 car, but IDK.
Click to expand...
Might not be anything wrong with the 12 V battery. I was getting that error frequently at one point and it turned out the buttons on my key fob were being pressed while in my pocket when I was sitting in my office, keeping the SE active. I now take the key out of my pocket and haven't had the issue.
 
polyphonic said:
We had a momentary notification today "battery discharging while stopped"

Time for new 12v? Seems a little early for a 2021 car, but IDK.
Click to expand...
I've had that intermittently since the car was new. Once while the dealer had it, after which they stopped telling me I must have been doing something wrong. If it happens while plugged in for a timed charge, the car won't charge. I fitted a 12V battery logger in December and am awaiting the next incident. Viewing logs, it does appear that the car will often have fits of waking frequently when it shouldn't.
 
Puppethead said:
Might not be anything wrong with the 12 V battery. I was getting that error frequently at one point and it turned out the buttons on my key fob were being pressed while in my pocket when I was sitting in my office, keeping the SE active. I now take the key out of my pocket and haven't had the issue.
Click to expand...
Mine will do it with the fob in a cupboard or just completely out of range.
 
Puppethead said:
Having owned multiple MINIs and needing to replace a few batteries, my experience is they use AGM batteries and they have to be "paired" with the vehicle. I believe there are issues that can come up (errors, etc.) if one doesn't do the pairing process.
Click to expand...

My now sold R56S' battery lasted 7 years and conked out about a year before I sold him. I have a BMW/MINI/RR scanner (looking forward to plugging it into a Rolls - wonder if the OBD port is behind a special panel or just under the dash like our pleb mobiles) and it didn't want to code it. The IBS is supposed to be on the negative cable and I didn't see one on mine so I guess I didn't have one. If you do have an IBS on your negative cable then yes do code it as if not done the battery can have a much reduced lifespan as discussed over at NAM.

I'd expect 5 years plus from a good 12V but I have read that many EVs don't cycle the 12V as hard as ICE cars and they don't last as long. I'll have to wait and see.

cheers
MacMini34
 
teddybare said:
maybe i missed it but did anyone answer the OPs question. Has anyone replaced the 12v battery on there se
Click to expand...
I sold BMW I3 with 7 years old battery which was only 20 Ah as I was monitoring that battery for last few month was always 14.4 volts in a morning.SE 12V battery is 50 Ah compared to I3 is a monster size as both cars have the same equipment. 12 V battery is automatically charged through DC to DC system from HV battery if car is plug for charging or not as long the system operate correctly and 12 V battery is not a lemon I will not be worry about it as the oldest SE is about 5 years old I doubt if anybody replaced yet. I belive at dealer OM AGM - 12 V battery is about $450
 
If you get the battery discharge warning message frequently you can try to do a deep slow charge of it. Or replace it. At the shop we try the slow charger method first.

be happy you don’t have to worry about 12v lithium ion batteries yet….
 
MrSnrub said:
be happy you don’t have to worry about 12v lithium ion batteries yet….
Click to expand...
They do exist and I considering switching to one, but price was too high. Certainly lighter than a lead-acid battery, but since the SE uses a relatively small AGM battery maybe the weight difference wouldn't be significant. What's the downside? Maybe the way the SE keeps the 12 V battery charged to 100% would be detrimental?

A lithium-ion upgrade for your car, but not the one you’re expecting
 
MrSnrub said:
If you get the battery discharge warning message frequently you can try to do a deep slow charge of it. Or replace it. At the shop we try the slow charger method first.

be happy you don’t have to worry about 12v lithium ion batteries yet….
Click to expand...
The mini cooper SE uses a 50 Ah AGM Absorbed Glass Mat battery for its low-voltage system 12 v. For starting and powering accessories as HVB pack is a lithium-ion battery just to straight this opinion.
 
Puppethead said:
They do exist and I considering switching to one, but price was too high. Certainly lighter than a lead-acid battery, but since the SE uses a relatively small AGM battery maybe the weight difference wouldn't be significant. What's the downside? Maybe the way the SE keeps the 12 V battery charged to 100% would be detrimental?

A lithium-ion upgrade for your car, but not the one you’re expecting
Click to expand...
As I’m using AGM 12v batteries for many years on gas cars they never fail in 5 years as a precaution I always change them after 5 years if I keep car that long ? but as I said before i3 20 Ah survive 7 years in SE 50 AH should last longer as powering the same equipment of SE with weight of 40 lbs to 20Ah 20 lbs as we talking about lighter lithium- ion 12 v. Batteries and more expensive too I wish to loose 25 lbs on my body weight to compensate heavier AGM B to lithium-ion . Price is very important . Why SE have 12 v battery on driver side do not try balance a weight of a car as we drive that car mostly as a single occupants should be on passenger side
 
You must log in or register to reply here.
Back
Top