P0A80 code for good HV battery?
#91
Re: P0A80 code for good HV battery?
You have three choices:
- Buy the battery as though it was any other over-the-counter part with no special treatment or documentation.
- Try to buy the battery but ask for any of this silliness you're imagining and be told a HARD NO.
- Don't buy the battery.
#93
Re: P0A80 code for good HV battery?
In the battery health section, notable is the 0.25V ceiling on the voltage deviation and the increase of estimated capacity to about 4Ah.
This is a demonstrable improvement.
If you want to experiment, you could repeat the process to see if any additional gains can be had. Given the ~15-20% improvement, I would not expect there to be any additional improvement beyond 3-5%, and IMHO, that's not worth it.
Repeat discharge test every 6 months and decide if you want to conduct a single cycle.
This is a demonstrable improvement.
If you want to experiment, you could repeat the process to see if any additional gains can be had. Given the ~15-20% improvement, I would not expect there to be any additional improvement beyond 3-5%, and IMHO, that's not worth it.
Repeat discharge test every 6 months and decide if you want to conduct a single cycle.
#94
Re: P0A80 code for good HV battery?
Thanks, Mr. Keith. Will repeat the test in 6 months and do another cycle then if needed. I am curious about how long I can expect the battery to last with periodic cycles like this. Also, would I always only dicharge to 163V or is there a situation where I would go lower.
EDIT: Car currently has ~155K miles.
EDIT: Car currently has ~155K miles.
Last edited by srivenkat; 09-24-2020 at 04:13 PM.
#95
Re: P0A80 code for good HV battery?
Diagnostic tests aren't predictive, nor can the longevity benefit of reconditioning be quantified.
Problems start occurring very regularly once a battery deteriorates to 35-40% rated capacity. The longer you can stay above that threshold, the better.
Other measures such as more conservative driving, heavy A/C use with center vents lobbing their output onto the back deck, sun shades, shade, covered parking, cracking windows 1/4-1/2 inch, park facing West so that the sunshade is more effective, etc., can potentially increase battery life.
Problems start occurring very regularly once a battery deteriorates to 35-40% rated capacity. The longer you can stay above that threshold, the better.
Other measures such as more conservative driving, heavy A/C use with center vents lobbing their output onto the back deck, sun shades, shade, covered parking, cracking windows 1/4-1/2 inch, park facing West so that the sunshade is more effective, etc., can potentially increase battery life.
#97
Re: P0A80 code for good HV battery?
Mr. Keith, I am also curious if light corrosion of the bus bars, which I noticed when I connected the harness 2 years back have a role to play in the deterioration of the battery. If not, I am wondering how to tell if the corrosion becomes significant enough at some point in the future that the bus bars need to be cleaned/replaced. Thanks.
#98
Re: P0A80 code for good HV battery?
While one can find accounts of alleged avoidance of battery replacement by cleaning bus bars, those accounts rarely include follow-up.
Personally, in well over 400 batteries, I have never encountered one that had corrosion sufficient to inhibit function. The operational portion of the bus bar is where it contacts the terminal end faces. If the contact faces are clean, then bus bar function is not compromised. One can't tell if the face is clean without removing it; however, in my experience, even in the cases where the copper was black and crusty, the bus bar contact faces were clean.
That said, I either use cleaned or nickel plated bus bars when assembling a battery.
Will it benefit you? Probably not.
Wil it hurt anything? No, as long as you re-torque all terminal nuts to 48 in-lb.
Will it make you feel better? Yes.
Personally, in well over 400 batteries, I have never encountered one that had corrosion sufficient to inhibit function. The operational portion of the bus bar is where it contacts the terminal end faces. If the contact faces are clean, then bus bar function is not compromised. One can't tell if the face is clean without removing it; however, in my experience, even in the cases where the copper was black and crusty, the bus bar contact faces were clean.
That said, I either use cleaned or nickel plated bus bars when assembling a battery.
Will it benefit you? Probably not.
Wil it hurt anything? No, as long as you re-torque all terminal nuts to 48 in-lb.
Will it make you feel better? Yes.
#99
Re: P0A80 code for good HV battery?
Thanks for the info on the bus bars. A friend of mine got his HV battery replaced at the dealer 4 days back. I did a HA test on the new battery and attached is the report. It shows the capacity as 5.27Ah which seems low to me. Also, the foam piece at the right rear corner is sliced and there are dark smears on the rear bottom lip of the battery (photo attached). Would be grateful for your comments.
#100
Re: P0A80 code for good HV battery?
Black is uncleaned residue from welding.
Outside case is consistent with a new battery.
Torn foam is atypical.
Test looks like a new battery:
The SoC curve in the health test is constant slope resembling a "V" between charging and discharging.
DeltaV only breaks 0.2V on 3 instances.
Capacity number is EXTRAPOLATED from a test of a only 29.4% of its operating range. It's not exact. I'm not the least bit concerned about the number.
You can remove the ducting going into the top of the case from the fan and take a picture of the closest module S/N.
Outside case is consistent with a new battery.
Torn foam is atypical.
Test looks like a new battery:
The SoC curve in the health test is constant slope resembling a "V" between charging and discharging.
DeltaV only breaks 0.2V on 3 instances.
Capacity number is EXTRAPOLATED from a test of a only 29.4% of its operating range. It's not exact. I'm not the least bit concerned about the number.
You can remove the ducting going into the top of the case from the fan and take a picture of the closest module S/N.