Welcome to Tesla Motors Club
Discuss Tesla's Model S, Model 3, Model X, Model Y, Cybertruck, Roadster and More.
Register

Kinda disappointed that I have 5.5% degradation after 18k miles

dk10438

Member
Dec 23, 2016
359
190
Ranch Palos Verdes
As the title states, I’m disappointed that after 18k miles, my car already has 5.5 % degradation. When it was new, charging to 70% was 220 or 221 miles (about 315 at 100 %)

Now I’m only getting 209 miles which would give me about 298 miles at 100%. Thought I was taking good care of the battery, charge every night to 70 %, use super chargers infrequently and rarely charge over 90%.

From what I’ve read, I’m in the range of what is to be expected, but have more degradation than most? Charging habits don’t really predict degradation well anyway??
 

outdoors

Always roaming
Supporting Member
Aug 10, 2014
1,683
2,950
in the moment
Most of my 5.6% total degradation was between 2k and 30k 3.6% to be exact. First year. Now at 102k.

Have you ever done a true 100% charge? Not just a 70% or a 90%.
 

dk10438

Member
Dec 23, 2016
359
190
Ranch Palos Verdes
charged to 100% once and only got 300miles but drove it immediately after it finished charging. Maybe I should allow it to stay there for an hour or two before I disconnect to allow it to balance the cells? I've read different opinions about balancing (occurs after 93% SOC v. BMS does it constantly regardless of SOC)
 

Electric700

Active Member
May 21, 2013
1,739
424
Florida, United States
charged to 100% once and only got 300miles but drove it immediately after it finished charging. Maybe I should allow it to stay there for an hour or two before I disconnect to allow it to balance the cells? I've read different opinions about balancing (occurs after 93% SOC v. BMS does it constantly regardless of SOC)

You might try charging to 100% once more and drive it immediately after the charge completes. You can then drive to a 20% charge level and see if that helps to calibrate it. I try to charge to 100% once or twice yearly.

You might not actually have any loss in this case since it looks like you've treated your car really well. It could be more of a range calibration item.
 
  • Like
Reactions: Raechris

sorka

Well-Known Member
Feb 28, 2015
8,271
6,230
Merced, CA
As the title states, I’m disappointed that after 18k miles, my car already has 5.5 % degradation. When it was new, charging to 70% was 220 or 221 miles (about 315 at 100 %)

Now I’m only getting 209 miles which would give me about 298 miles at 100%. Thought I was taking good care of the battery, charge every night to 70 %, use super chargers infrequently and rarely charge over 90%.

From what I’ve read, I’m in the range of what is to be expected, but have more degradation than most? Charging habits don’t really predict degradation well anyway??

I'll bet most if not all of it is actually the software cap that locks out the top end of your battery introduced in V9. Do you know what your cell voltage is at 90 or 100%?

I'm also at 5.5% degradation but that's after 114K miles. When I'm forced to install V10 over V8, I'll probably have a very large drop.
 
  • Disagree
Reactions: tomas and MP3Mike

joltheadq

Member
Jun 10, 2019
91
60
Atlanta
I'll bet most if not all of it is actually the software cap that locks out the top end of your battery introduced in V9. Do you know what your cell voltage is at 90 or 100%?

I'm also at 5.5% degradation but that's after 114K miles. When I'm forced to install V10 over V8, I'll probably have a very large drop.

Don’t do it!
5542DA93-2B0D-40FE-929D-DFCC333BE1A4.jpeg
 
  • Funny
Reactions: sorka

MP3Mike

Well-Known Member
Feb 1, 2016
16,486
38,576
Oregon
I'll bet most if not all of it is actually the software cap that locks out the top end of your battery introduced in V9. Do you know what your cell voltage is at 90 or 100%?

Have we really seen 100kWh packs that have had the voltage capped?
 

sorka

Well-Known Member
Feb 28, 2015
8,271
6,230
Merced, CA
I didn't really follow how to calculate cell voltage at 100% SOC. Can you explain in lay terms?

If you can charge to 4.2 volts per cell at 100%, then you're not capped. If your voltage is lower than 4.2 at 100%, then you are capped. The lower the voltage at 100%, the more you are capped.

4.1 volts at 100% is 10% capped....for example.
 

aerodyne

Nose cone car - "Going to LR"
Nov 19, 2018
3,115
4,040
Los Angeles
And when you get the above, you will be able to see the full usable capacity per the BMS. Your degradation is probably twice what the rated range number is telling you.
 

Products we're discussing on TMC...

About Us

Formed in 2006, Tesla Motors Club (TMC) was the first independent online Tesla community. Today it remains the largest and most dynamic community of Tesla enthusiasts. Learn more.

Do you value your experience at TMC? Consider becoming a Supporting Member of Tesla Motors Club. As a thank you for your contribution, you'll get nearly no ads in the Community and Groups sections. Additional perks are available depending on the level of contribution. Please visit the Account Upgrades page for more details.


SUPPORT TMC
Top