Plug-In battery life?

No. Page 16 of the warranty and maintenance manual (at least on the 2018 manual):

Lithium-ion battery capacity (the ability to hold a charge) gradually reduces with time and use. This is a natural characteristic of lithium-ion batteries. The extent at which capacity is reduced changes drastically depending on the environment (ambient temperature, etc.) and usage conditions such as how the vehicle is driven and how the lithium-ion battery is charged. Reduction of lithium-ion battery capacity is NOT covered under warranty. In order to lessen the possibility of capacity reduction, follow the directions listed in the Owner’s Manual under “Capacity Reduction of the Hybrid Battery (Traction Battery).”

From the owner's manual:

■Capacity reduction of the hybrid battery (traction battery)

The capacity of the hybrid battery (traction battery) will decline gradually when the hybrid battery (traction battery) is in use. The rate at which it declines will differ in accordance with environmental conditions and the way in which the vehicle is used. Observing the following can help suppress battery capacity decline.

●Avoid parking the vehicle in areas with a high temperature under direct sunlight when the hybrid battery (traction battery) is fully charged.

●Avoid accelerating and decelerating frequently and suddenly when EV driving.

●Avoid frequent driving near the top speed for EV driving. (P. 87)

●Leave a low level of charge in the hybrid battery (traction battery) when leaving the vehicle undriven for a long period of time. After confirming that EV mode has switched to HV mode, turn the power switch off.

●Use the charging timer function as much as possible in order to fully charge the hybrid battery (traction battery) immediately before starting off. (P. 147)

Also, if the hybrid battery (traction battery) capacity reduces, the distance that can be driven in EV mode decreases. However, vehicle performance does not significantly become worse.

 

But if the battery completley fails in the warranty period they will replace it. 8 years in most states.

Blue

 

failure meaning it throws the bad battery trouble code.

 

welcome!
20% is fairly common, although it varies. it should stabilize there for a long time.

how are you measuring it?

 

What do you mean by "the battery dropped 20%"?

 

it is now only 2.4" high in the back deck

 

From other people responding to OP. I gather OP means the traction battery capacity has decreased by 20% from the original state. But, I still wonder how did he measure the decreased amount? And it happened all the sudden at 50K?

 

A lot of Li-Ion EVs seem to see a ~20% initial decrease in capacity followed by a long, long slow dropoff.

 

I certainly didn't experience that with my Prius PHV, even at 92,000 miles when I traded it for my Prius Prime.

It's the first post from a new member, who will get lots of helpful feedback, if some detail is provided. Otherwise, just ignore this thread. We simply don't have enough information to be constructive.

We need to know more about speed, temperature, distance, recharge frequency, etc.

 

Yup. Need more input. Insufficient data/

 

20% drop in EV range??

 

Yes Not Enough Data.
1. Temperature ,New tires or snow tires killed my mpg until weather improved.
2. One of my Prii had a stuck caliper that killed my mileage.
3. Reset computer on 2007 improved mpg
Many other things

 

If OP means a 20% drop in EV range, then I experienced more than 50% EV range drop in my first winter at only 5,000kmiles/5months. AFAIK, there is no dash display or any other easy way to measure capacity loss. Or is there?

 

Yes. There is. Run the battery until it goes to HV mode. Then charge using a Kill O Watt meter. Or goto a Charge Point station and charge. If there is a drop in KWh s added then you can tell.

Or use JuiceBox or ChargePoint at home.

Don't Know where the OP lives . But if they are in my Area i can show them free ChargePoint stations or I can charge the Prime off my JuiceBox and look at power input.

 

If at wall kWh reading used to fully charge the traction battery from zero EV range to full is the accurate indication of the true "capacity" of the traction battery, then I am not seeing any reduction of Lithium-ion battery capacity on my car in last 21 months or 25kmiles. My PRIME always takes 6.4-6.8 kWh per charge using L1 EVSE reading at a wall with Kill-a-watt meter. Will have to see what happens when it hits 50kmiles, but that will be 2 years from now.

 

I will be at 50,000 miles next April on my 18 Prime.

 

The highest my Juicebox has on record is 6.23 with most charges being under 6. Is L1 really that less efficient?

 

maybe L2 cuts off before the battery is completely full