Original Text Von Facebook :
For those waiting on updates -IMPORTANT 12V & IBS reminder
Ilts a long one so strap in!
Just a heads-up for everyone.
Make sure your 12V battery is being properly monitored by the car's 1BS (Ilntelligent
Battery Sensor).
My 12V was replaced in May 2025. Back then, I didn't calibrate the IBS. Car drove fine, no
warnings. Like most, I installed a BM2 Battery Monitor, and I also have a separate
handheld tester to check 12V health, SOC, and charge levels. Everything consistently
looked good during regular checks.
Handheld tester info:
I use the DonosHome DH310, which tests CCA, SOH, SOC, and charging performance. It
uses conductance technology, not just voltage, and normally gives very accurate results
so when it disagrees with the car, it definitely gets your attention.
I later saw the MTN Ranger's post about IBS calibration (
si=bSZ-G0_uvjBPXmht). ....thanks again for making our lives easier.., so I followed it but I
did not verify the true SOC/SOH of the battery beforehand.Ishould have.
Software update experience
Updates 2.2.1 -> 2.2.3 went fine (signal issues aside).
For 2.5, support checked remotely and said my 12V was good.
They repaired the Trex and pushed the update the same night.
It downloaded but disappeared when I tried to install it.
Drove 320-mile round trip hoping it would show, update still didn't reappear.
Reached out and OVLOOP later told me the car was reporting my 12V at ~62%, which is
why the update wasn't showing - but my BM2 and DH310 were reading ~90%.
OVLOOP manually pushed the update and it installed without issue.
A few weeks later, I noticed my ICC showed 81% one evening and 68% the next morning
a big unexplained drop.
I checked in with OVLOOP as my BM2 was ~88% and got some feedback.
OVLOOP explains and this is crucial, They clarified something important:
The Ocean's IBS is inline with the battery and measures ALL current going in and out.
That's how it calculates the real SOC and SOH over time.
Aftermarket monitors like the BM2 only read voltage at the terminals.
Voltage # true state of charge.
This explains why: BM2/DH310 were reading high and The car's 1BS had a much lower
SOC
The IBS is the system the car trusts for updates and power management not the
voltage-based monitor.
My testing today
Outside temperature: 16°C / 60.8°F
Device SOC
B2 96%
DH310 (handheld tester) 100%
Ocean ICC 69%
So I plugged in my 25A smart charger and let it do its thing
With the charger connected, the Ocean ICC suddenly showed 99%.
This proves something big:
You can temporarily fool the ICC display with external charging
But the IBS will still know the true state internally
So be careful doing this during updates could trick the car into thinking the battery is
healthy enough, even when it isn't.
llet it charge for 2 hours, knowing the charger would maintain once full.
Then I re-did the 1BS calibration steps.
After finishing , I left the car out of Ready mode with radio on (and blower accidentally left
on), to do some in car cleaning
When done, I checked again:
Device SOC
BM2 85%
DH310 86%
ICC 86%
Jow they matched.
Moral of the story
When replacing the 12V battery
Fully charge the battery first
Confirm it is truly at 100% (not just voltage high)
THEN perform the 1BS calibration
Don't just rely on the default "30-minute charge."
If the battery wasn't actually full at calibration, then the car will maybe "think" 100%
equals whatever lower state the battery was at and everything reads wrong from there.
Don't just rely on the default "30-minute charge.'"
If the battery wasn't actually full at calibration, then the car will maybe "think" 1 00%
equals whatever lower state the battery was at and everything reads wrong from there.
This can cause SOC issues and update problems later.
Final takeaway
IBS tracks actual current in/out -> most accurate
BM2 & handheld testers are good tools, but voltage # SOC
ICC 12v reading can be fooled.
Proper charge -+ IBS calibration is key to smooth updates and accurate readings
Hope this helps someone avoid the same confusion and delays.
