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 Post subject: Re: Extended Charge not working
PostPosted: Tue Jan 22, 2019 10:49 pm 
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Joined: Wed Jul 19, 2017 5:41 am
Posts: 9
Thanks for the clarification.

I'm surprised that with 15% or more degradation the battery is being charge to 100% capacity, or essentially an Extended charge. My owners manual says this can/will shorten the life of the battery, as opposed to an 85% capacity charge.

Any way to keep from cooking the battery to 100% charge every time it's charged?


Thanks for the info, Mark


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 Post subject: Re: Extended Charge not working
PostPosted: Wed Jan 23, 2019 2:57 am 
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Joined: Mon May 19, 2014 4:49 am
Posts: 620
Location: Ithaca, NY
atzmark wrote:
Thanks for the clarification.

I'm surprised that with 15% or more degradation the battery is being charge to 100% capacity, or essentially an Extended charge. My owners manual says this can/will shorten the life of the battery, as opposed to an 85% capacity charge.

Any way to keep from cooking the battery to 100% charge every time it's charged?


Thanks for the info, Mark


I'm not sure where to start.. lol

You arent cooking anything. The battery has a thermal management system that maintains temperature. But that is totally unrelated.

Your battery's BMS will monitor the pack. You aren't going to some how give it more capacity than it has.

If you are worried about it, dont use extended range mode. You know how to turn it on and off right?

How many miles are on the car? I haven't seen or heard of a car with more than 15% battery degradation yet. Someone might have experienced it but I haven't seen anyone complaining about it yet. But its only a matter of time. As these cars get older and the battery sees more cycles degradation will happen.

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 Post subject: Re: Extended Charge not working
PostPosted: Wed Jan 23, 2019 7:58 am 
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Joined: Mon May 13, 2013 6:15 am
Posts: 343
Location: Volcano, CA
I notice my battery is in this condition when it would actually stop charging correctly if you selected Extended Mode.
Not selecting that seems to work perfectly.

I also notice from my charge curvethat the battery is tailing off charge rate before it reaches the end of a standard charge (it never did this in the past).

So the car runs fine, its just the range is less than it used to be. Thats just living with an EV for 6 years now. I havent done a Tony Test recently but it *seems* like the car is about 10-15% less range-ful than when i bought it. I mostly drive in the mountains (I retired after 5 years of owning this car) and the shorter range isnt an issue because i use this car for around town (and in weather i dont want to drive my Tesla Model 3 in)

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 Post subject: Re: Extended Charge not working
PostPosted: Thu Jan 24, 2019 9:42 pm 
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Joined: Thu Nov 02, 2017 8:57 pm
Posts: 43
Location: Salisbury, NC
It's worth noting the ambient temperature when you charge is quite important: a cold battery won't hold as much, so extended charge will appear to have less capacity. In summer, full standard and extended charges might show 35 and 41 kWhr available, but during the winter I see more like 35 and 37 kWhr between the two modes. Coupled with lower efficiency (~2 mi/kWhr) from running electric heat, and the standard vs extended range shown on the GOM is barely noticeable.


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 Post subject: Re: Extended Charge not working
PostPosted: Sun Jan 27, 2019 5:11 am 
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Joined: Mon May 13, 2013 6:15 am
Posts: 343
Location: Volcano, CA
Yeah when i ran that charge curve it was probably 32 degrees F. (My car is usually outside, and its about freezing every morning here now).
So yeah. some of the apparent degradation is due to that.

So just as a comparison my GOM usually shows between 68 and 72 miles now for a full "standard" charge. I think the range is probably a little more than that really but in summer when it was new i used to get ~96 miles up here. (you use more power up here becuase you're always driving up and down hills, so its never in the 120 range that it was when i was driving it new in the Bay Area.)

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 Post subject: Re: Extended Charge not working
PostPosted: Thu Aug 08, 2019 3:18 am 
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Joined: Wed Nov 14, 2012 9:50 pm
Posts: 4075
Location: San Diego
Your extended charging is working fine, and so is the battery.

All the Rav4 EVs are degraded 5-10% already, just due to age. Extreme use, or high ambient temperatures might have further reduced the battery capacity. And, finally, actual "cycles" / miles will degrade the battery. Time, heat and use... just that simple.

As the RAV4 EV fleet approaches 100,000 miles, the batteries will likely be in the 10-20% degradation area, and with a few cars approaching 150,000 miles, 15% + is very likely.

Do the Tony-Test, and quit focusing on the daily GOM value. It's sad to think how many people sold or traded their RAV4 EV because, "I used to get 120-140 miles on the GOM, and now I only get 70, so I sold it". Sadly, they just didn't know, or didn't bother to ask if that was accurate.

Once you PROPERLY done the Tony-Test, I'm confident that your fears will subside.

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