How to detect dying traction battery

DrPrius has you force charge the battery to "full" (near 80% SOC) then discharge it at around 6 amps until near 45%. The app monitors the voltage, amps/ current, and how long it takes to discharge (aka, the amount of power that the pack can discharge)- then it does some math to come up with an approximate capacity.

AFAIK, the only thing that "changes" as a battery normally ages is that the battery SOC increases and decreases more quickly as capacity decreases. (delta SOC and voltage difference can go up but those are indicators of pack deterioration)
I am not aware of any "settings" that are different from a new pack vs a worn out pack.

Posted via the PriusChat mobile app.

 

perhaps the rapid change in charging/discharging is due to the reduction at the top and bottom.

have your mpg's suffered?

 

Mine is 12 years, and it was about 2-3 months back that I noticed it seemed to discharge quicker,
and charge from 2 lined up to 3 very slowly. Then it would just to 4 lines much quicker.
If it was at 3 lines overnight, half the time it wouldn't let me go into EV mode in the morning,
saying the hybrid battery is low.

I purchased the Prolong system and ran it through the 4 charges and 3 discharge cycles.
Now it's back to what it was doing when I go it. It certainly has made an improvement for me.
Now both the charge/discharge cycles are gradual. And it was $1000 less than new cells.

I believe I did mine before the battery got is the weakened state. I wanted to do it last year, but
I didn't have the money at the time. I have not had any lights or warning about the battery getting weak.

You might want to think about doing the reconditioning before you get any warnings, or before it gets worse.
It certainly won't get better on it's own.

You will just need about 3 days for the complete reconditioning.

 

Here's my thread from our old 2010 on the topic of battery reconditioning :

2010 Prius II HV Battery Reconditioning

Good luck and keep us posted.