Drive battery drain

kcsunshine

Well-Known Member
I have been having a slow drive battery drain. One day when I got the car out of the valet garage, it had zero bars. It wasn't driven for about 2 weeks which is normal for me. I know it is not good for the battery to be nearly drained. It did charge up after being driven. I parked the car again in the garage with about 4-5 bars of charge. I can see the battery percentage going down 8% in 4 days with the Honda Link app. I never experienced this before. It has been fairly cold so I wonder if the battery is being kept warm causing the drain. I'm afraid I have to keep the car charged with at least 5-6 bars to prevent zero bars again. If there is a battery problem, would this be covered by warranty? It is a 2018 with only 42k miles and I'm in NY.
 
Hello kcsunshine-

Short: I think I initially miss-read your question, but I'll leave the long answer below in case it helps someone else. The short of the traction battery warranty is you get either 8yr/100k miles or 10yr/150kmiles years depending on if you're in a ZEV state or not. "
Battery Assembly (including all internal components)
8/100
10/150"
This forum has resources for reading the traction battery's capacity. See:

Long:
When I bought my Clarity brand new (Sept 2018), I believe I had the problem you are describing. In my case, the car's EV bars would go down even when driving in HV mode. The drain rate was such that my EV range would go to zero (no bars), even in HV mode, over 110 miles. I then got the worst "angry bees" sound anyone has ever heard.

I came to these forums and asked for advice. I think for several months, folks didn't understand what I was saying because this is abnormal behavior. That is to say when the car is in HV mode, it's supposed to largely maintain EV charge level. Maybe over a 1000 mile journey it would go down somewhat but not out of charge in 100 miles or so. And I didn't realize it was abnormal to see zero bars on the EV charge. It's supposed to retain 2 bars all the time, and just go into perpetual hybrid mode. My car never did that. Also my car literally never showed the gear icon on flat ground on the freeway at speeds above 45Mph (which is a normal function of the car). It means you're basically in over-drive and the engine is direct driving the wheels which yields the best gas milage when in hybrid mode.

Anyway, one of our old members (and likely beloved because he is smart and kind) "KentuckyKen" told me to reboot my car. That is remove the negative lead on the 12v battery, let it sit a few minutes, then replace-- of course with the car off. Then once replace start the car. You'll see a bunch of warnings that clear as you drive your first 10 or so miles after doing this reset. The reset in my case fixed the problem, maybe six months into ownership.

Also if you do end up needing repair (i.e. new charger) you might check if covered by the extended emissions warranty parts list (attached). Edit: It looks like even the non-ZEV states get you 8 years of coverage on the charger and cables. So if this happens within 8 years, you should be covered even outside ZEV states. If you are in a ZEV state you get additional coverage. I mention because my charger did later die, and it was covered.

-Dan

ZEV states:
California, Connecticut, Delaware, Maine, Maryland, Massachusetts, New Jersey, New York, Oregon, Pennsylvania, Rhode Island, Vermont, and Washington.
 

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