Longer term Ohmmu experiences?

[Flybyglass]

Did my first cold weather test today on the Ohmmu.

So far, all is perfect with the Heated Ohmmu.

Started the test this morning on my Model 3. Backed out of the non heated garage (at 50F) into driveway (shaded) at 28F.

Left outside for 3 hours. Ending outside temperate 31F.

Ohmmu NON -Heated temperature (control) 36.3F (on ground not installed). Heated Ohmmu (car asleep) 46.8F (installed).

Interior showed 32F. No warnings on notifications menu.

No Alerts in Service Mode.

LV battery indications all normal.

Drove for a few minutes and no change. All remained normal.

Software 2023.27.7. Ohmmu Firmware V65 with Model 3 configuration.

u V4+

 

[Flybyglass]

I dont have one of those batteries, but was following that discussion out of curiosity. In the end, it appeared that Ohmmu both worked around whatever the issue was with the firmware update, AND swapped out previous purchasers with the "version 2" version of the battery which corrected the issue.

The current battery is Version 4+ Heated for model 3/Y.

 

[mstatkus]

Think that TeLink OTA bricked my v4+. Haven’t seen it show up on Bluetooth for a hour now.

 

[Flybyglass]

Think that TeLink OTA bricked my v4+. Haven’t seen it show up on Bluetooth for a hour now.

I updated both my 4+ and 4+H. Make sure V65 is in the TeLinkOTA folder. Then actual update took maybe 30 seconds. If no luck, try again with a new data file download in case its corrupted. Let Ohmmu know. They may have a solution or ask for a replacement preferably heated.

 

[mstatkus]

Yeah it’s probably toast. Suspect it requires disassembly and hard lines to save it now.

 

[3rror]

So are these batteries working now with all the latest versions and firmware updates? I saw this on X, regarding service mode on newer Telsa firmware. Do you think changing the low voltage battery type helps with this and other aftermarket batteries? It's a curiosity since I think that might be a newer option.

 

[mstatkus]

I’m going inside my v4+.
BMS: JBD Smart BMS 4S 100A 150A with Built-in Blutooth, Heating function or Switch function Support Series Connection freeshipping - Jiabaida BMS

 

[Flybyglass]

I’m going inside my v4+.
BMS: JBD Smart BMS 4S 100A 150A with Built-in Blutooth, Heating function or Switch function Support Series Connection freeshipping - Jiabaida BMS

Are you adding the heating function and a new BMS? A science experiment?

 

[mstatkus]

Looks like I need a UART interface to maybe save the firmware.

Also this appears to be a 100A model and gauge wire inside I wouldn’t push it past that.

 

[(@r8[]np4nd4]

Today we had 3°C/37°F outside temperature and I get the Battery Warnings again. VCFRONT_a182, a192, a402.
Battery Temperature was 5.5°C/42°F.
Again, this is with the Ohmmu battery with heating element!
It seams like it doesn't work as intended.

I don't know why Sean doesn't respond to my emails anymore. This is my 4th ohmmu battery for the Model 3 and everytime I run into the same issues.

 

[Flybyglass]

Today we had 3°C/37°F outside temperature and I get the Battery Warnings again. VCFRONT_a182, a192, a402.
Battery Temperature was 5.5°C/42°F.
Again, this is with the Ohmmu battery with heating element!
It seams like it doesn't work as intended.

I don't know why Sean doesn't respond to my emails anymore. This is my 4th ohmmu battery for the Model 3 and everytime I run into the same issues.

I got the same warnings. First time 28F no warnings but after 3 weeks it appears the heating element is no longer working. I initially would see 12F difference from heated and non heated. Now no difference. I placed a V4+ and V4+H into a freezer even attaching charger to V4+H to see if battery needed a charger to operate heater and no change. Firmware was updated to V65 not sure if this caused issue or not. WIth heat working no warnings and worked perfectly. WIth possible heat failure, warnings as above under 50F. Send a note to Ohmmu that you suspect the heating element is no longer working. Hopefully they have a fix.

 

[brkaus]

Why not use OEM again, esp for the 3/Y. Buy a new one every 2.5 years for safety and still save money.

 

[(@r8[]np4nd4]

Why not use OEM again, esp for the 3/Y. Buy a new one every 2.5 years for safety and still save money.

The main reason for me is weight savings

 

[brkaus]

The main reason for me is weight savings

about 17 lbs. my wife would tell me to keep the OEM battery and get myself in a treadmill.

 

[(@r8[]np4nd4]

I got the same warnings. First time 28F no warnings but after 3 weeks it appears the heating element is no longer working. I initially would see 12F difference from heated and non heated. Now no difference. I placed a V4+ and V4+H into a freezer even attaching charger to V4+H to see if battery needed a charger to operate heater and no change. Firmware was updated to V65 not sure if this caused issue or not. WIth heat working no warnings and worked perfectly. WIth possible heat failure, warnings as above under 50F. Send a note to Ohmmu that you suspect the heating element is no longer working. Hopefully they have a fix.

Are you in contact with ohmmu support? What do they say about your findings?

 

[Flybyglass]

Are you in contact with ohmmu support? What do they say about your findings?

So far nothing. I supplied a lot of information including comparing battery temperatures for the heated and non-heated model at low temps. That is how I determined the heater probably failed whether hardware or software not sure yet. Wondering of this is a hardware issue or software. If hardware not good. Meanwhile my backup Atlas died after 2 years mostly on the shelf but maintained throughout. Down to my Diehard EV battery as a backup. A question above was why a Lithium? Because after a year every time getting into the car I have to wonder "Is today the day the 12 volt dies?" If no Ohmmu fix then very 2 years it will be filters/rotate/brake pin lube (from salt) and replace 12 volt battery.

 

[Flybyglass]

Are you in contact with ohmmu support? What do they say about your findings?

Got a reply. 1. heating only active while charging. 2. He sent me a revised firmware file .V29. He may have sent the same to you.

 

[Flybyglass]

Got a reply. 1. heating only active while charging. 2. He sent me a revised firmware file .V29. He may have sent the same to you.

V29 firmware installed. Heating element looks operational again. Battery reinstalled. OAT 37F so far no warnings or messages. We'll see over the weekend.

 

[(@r8[]np4nd4]

V29 firmware installed. Heating element looks operational again. Battery reinstalled. OAT 37F so far no warnings or messages. We'll see over the weekend.

Would you please share or send me the firmware file please?

 

[mstatkus]

Watching these

I even get the feeling many get the programming wrong.
I didn’t need a multi tool to pop the top heh. It actually broke free pretty easy.