Battery Warranty

What do you mean they have been getting away with? I have no such problems with my car. There is an 8-15year/ 100k/150k mile warranties on the battery and charging systems. If the battery on your fourth gen is bad bring it and and they will replace it, period end of story. That's what the warranty is for.

 

unfortunately, in north america, there's no such thing as warranty unless the car throws a trouble code.

we don't have anything like a health check program.

 

The 4th gen Prius has a Li-ion battery unless it's an AWD. Those heat issues aren't really a problem. I live in over 100degF temps, never had this issue.

The OP has said their car is in limp mode and is showing several signs of needing a new battery. If could very easily have a code with no cel.

 

Absolutely, but it doesn’t do us any good. There is no 70% warranty rule here

 

The Gen 4 Prius 2 has a Ni-MH (nickel metal hydride battery) From what I understand every other Gen 4 Prius is Lithium ion.

 

This was my understanding as well except for the AWD versions getting NIMH because it performs better in cold weather.

 

it's probably different in different countries. we don't even have the same packages

 

I would guess the simple solution would be to use your A/C. I'm assuming your pack is pulling the cooling air from the passenger compartment. Also have the dealership / mechanic check the traction battery cooling system functionality - filters, fan, exhaust path. If there's a problem there, your literally cooking your battery and it'll die just outside of warranty. If your already experiencing these problems - your shaving precious battery life off the pack every-time it overheats - there should be CEL codes!!!! Bisco #7 is correct - there is no such thing as a 70% battery life battery change - at least on this side of the pond.

PS. last time I looked at Dr Prius; there was no Lithium battery life projection option, but it's been a few years. Most of our gen4 are lithium traction packs.

Hope this helps.....

 

The AWD has the NIMH due to space limitations. (That rear drive takes up some space). The ECU is limiting charge and discharge due to battery temperature limitations. Running in EV mode raises the battery temperature, so , duh, the car says “battery temperature is up, don’t allow it to go higher”. While Dr Prius is helpful in giving a general idea of hybrid battery health but it is not necessarily capable of producing pass or fail results. So a 9% differential is not something to go to the bank on. Have it tested by a dealership before getting all excited over what a phone app is telling you.

 

Which sucks because Lithium batteries do not like to be charged while frozen. Today, according to Hybrid Assistant, the battery pack was at -4°C and the car still merrily sent power back to it while braking

 

Do you guys in the US not have a yearly Hybrid Health check?

This is carried out free of charge each year at the time of service and this gives an extra year of warranty for the car and the traction battery up to 10 years or 100,000 miles.

 

No, it's an outright warranty - which means that it must trip a code once or twice.

My old Honda hybrid had to trip a battery code three times before the dealership would agree to replace it. I knew it was going bad because the charge / discharge cycles was very rapid - so I drove it like I stole it, since I was very close to the end of warranty. Tripped the proper codes twice more in a week and a half. When the dealership saw the trend data, they claimed I was driving it too aggressively. I told them that you prefer that I get squished by the big rig barreling down on me? They then agreed to order and replace the battery in two weeks.

Hope this helps....

 

we don't even have federally mandated safety checks, i think it's state by state. it's much more lax here in ma than when i first sterted driving in the 70's.

 

Of course it was: sending a controlled current into the battery will warm it up, and -4 C is well within the operational range of the battery pack.

 

You're sure about that?

Lithium Ion: Li-ion can be fast charged from 5°C to 45°C (41 to 113°F). Below 5°C, the charge current should be reduced, and no charging is permitted at freezing temperatures because of the reduced diffusion rates on the anode.

BU-410: Charging at High and Low Temperatures - Battery University

 

Yes, I am sure about that. The document you refer to is in regard to consumer grade batteries.