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Hi, from the owners manual they said..

Gradual capacity loss of the high voltage battery is expected and not covered under warranty. Greater than normal degradation is covered for 8 years or 100,000 miles, and can be determined by an authorized Honda Clarity Plug-In Hybrid dealer.


Does anyone know what the normal expected degradation is over the 8 years?
My normal daily driving is under 50 miles a day so I am hoping I can use the battery most of the time.

Thanks
Hoov
 

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Degradation varies quite a bit from vehicle to vehicle, though its expected for there to be a loss of a few percent each year. But with battery calibration and your computer learning its parameters, I wouldn't expect any significant loss in your first few years of ownership.
 

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I think we might have to look up a guide or something that covers best practices to ensure we get the most from our batteries.
When the habits are often small and easy, it goes a long way if you plan on being a long-term owner.
 

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Hi, from the owners manual they said..

Gradual capacity loss of the high voltage battery is expected and not covered under warranty. Greater than normal degradation is covered for 8 years or 100,000 miles, and can be determined by an authorized Honda Clarity Plug-In Hybrid dealer.


Does anyone know what the normal expected degradation is over the 8 years?
My normal daily driving is under 50 miles a day so I am hoping I can use the battery most of the time.

Thanks
Hoov
Greetings,

I wanted to follow up on this subject to see how your batteries are holding up. How much degradation are you seeing per year in your overall mileage, in the same season to take temperatures out of the equation?

I have been dealing with this question for the past year and cannot find an authorized dealer who can tell me what "Normal" is. The Sales staff will tell you that you should have NO degradation in the first few years of ownership but they are trying to sell you a car. If you ask the service department, no can answer that question. I have had service techs call Honda directly for the answer and still no information. How can you determine what is "Greater than Normal Degradation" is, if you don't have a bench line to compare to? If you can't prove your degradation is greater than normal, it will never be covered as a warranty item.

I was down about 29% of my charge range within the first 12 months in Southern California where it's never cold.
 

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Greetings,

I wanted to follow up on this subject to see how your batteries are holding up. How much degradation are you seeing per year in your overall mileage, in the same season to take temperatures out of the equation?

I have been dealing with this question for the past year and cannot find an authorized dealer who can tell me what "Normal" is. The Sales staff will tell you that you should have NO degradation in the first few years of ownership but they are trying to sell you a car. If you ask the service department, no can answer that question. I have had service techs call Honda directly for the answer and still no information. How can you determine what is "Greater than Normal Degradation" is, if you don't have a bench line to compare to? If you can't prove your degradation is greater than normal, it will never be covered as a warranty item.

I was down about 29% of my charge range within the first 12 months in Southern California where it's never cold.
The Clarity stores a value in its computer called Battery Capacity. An OBD-II device is needed to retrieve this value from the computer. A new battery has a value of 55 Ah (Amp hours). Warranty replacement only occurs if the value has dropped to 36.6 Ah which is a loss of 33%. My 2018 Clarity has 17,000 miles and when I recently checked my Battery Capacity it is 53.6. Some people have reported values like 50 or lower, those people say they have less EV range than they used to.

The dealer can hook your car up to their computer and read the value, but most don't know how, and when they do know how they sometimes charge you to check it unless you have the car already in for some other service then they sometimes do it for free.

Or you can check it yourself, see post #6 in the thread that is linked below which has a recommended OBD-II device and phone app. I followed the recommendation and it worked for me.

 
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