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 Post subject: Re: ALL POSTS - 12-volt battery replacement
PostPosted: Mon Apr 09, 2018 4:13 am 
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Joined: Wed Mar 13, 2013 5:51 pm
Posts: 38
Here is my current battery problem.

Car is 5 Yr old
Never Changed the 12 V battery
Clipper Creek 10 AMP Charger

One Morning, The car was trying to charge but i keep hearing click sounds and retries again and again until in the Evening i am back from office.

Car 12V battery is dead as the car no longer turns on.

Jump started using another car, RAV4EV turned on Fine. As soon as i disconnected jumper cable. RAV4EV went dead.

Jump started again and let the other car ON for next 15 mins and jumper cables connected. Assuiming RAV4EV 12 V battery will get charged.

RAV4EV didn't shutdown even after removing the jumper cable.

Tried to charge the car again and it keep making clicking sounds and i disconnected the charging cable.

I turned off the RAV4EV and after 30 Mins RAV4EV doesn't even start again.


Is it 12 V battery problem or something else. Please let me know. Based on your suggestions i will have to decide to take the car to PepBoys or Toyota Dealership .

Advanced thanks for the feedback.


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 Post subject: Re: ALL POSTS - 12-volt battery replacement
PostPosted: Mon Apr 09, 2018 6:47 pm 
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Joined: Mon Apr 01, 2013 11:42 pm
Posts: 310
Location: San Diego, CA, USA
It is almost certainly the 12v battery. That the original battery lasted for 5 years is a minor miracle as the RAV is really hard on them. Do NOT reconnect the dead battery to the car any more (and if it's connected, disconnect it). Low voltage situations have been known to cause lockups that require dealer intervention to correct. Get a new battery and install it ASAP. Read further up the thread for specific battery recommendations.


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 Post subject: Re: ALL POSTS - 12-volt battery replacement
PostPosted: Tue Apr 10, 2018 2:22 am 
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Joined: Mon Feb 24, 2014 8:51 pm
Posts: 623
Need to measure the actual 12v battery voltage after you remove the cables. Voltage should rise above 14 volts if the DC/DC converter is working.
Regardless you needed a new 12v battery a year ago.


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 Post subject: Re: ALL POSTS - 12-volt battery replacement
PostPosted: Wed Apr 11, 2018 4:45 pm 
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Joined: Wed Nov 14, 2012 9:50 pm
Posts: 4094
Location: San Diego
Yet another GREAT example of why you don’t wait to change the 12volt battery. If you have the original 12 volt battery, CHANGE IT NOW.

Good luck with all the issues caused by not proactively replacing the 12volt battery.


ravisekhar wrote:
Here is my current battery problem.

Car is 5 Yr old
Never Changed the 12 V battery
Clipper Creek 10 AMP Charger

One Morning, The car was trying to charge but i keep hearing click sounds and retries again and again until in the Evening i am back from office.

Car 12V battery is dead as the car no longer turns on.

Jump started using another car, RAV4EV turned on Fine. As soon as i disconnected jumper cable. RAV4EV went dead.

Jump started again and let the other car ON for next 15 mins and jumper cables connected. Assuiming RAV4EV 12 V battery will get charged.

RAV4EV didn't shutdown even after removing the jumper cable.

Tried to charge the car again and it keep making clicking sounds and i disconnected the charging cable.

I turned off the RAV4EV and after 30 Mins RAV4EV doesn't even start again.


Is it 12 V battery problem or something else. Please let me know. Based on your suggestions i will have to decide to take the car to PepBoys or Toyota Dealership .

Advanced thanks for the feedback.

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 Post subject: Re: ALL POSTS - 12-volt battery replacement
PostPosted: Sun May 27, 2018 2:42 am 
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Joined: Sat Apr 19, 2014 12:57 am
Posts: 91
Location: SF Bay Area, Danville, CA
I did what Tony said and replaced my original battery, that was almost 4 years old, with the Bosch AGM in February. I've been getting air bag error messages for the last few days so I checked the voltage when I got home and it read 9.6 volts. I charged it to 14.6 and disconnected the charger and the voltage started dropping. I disconnected the neg terminal and the battery is holding at 12.75v. I get a pretty good spark when I touch the neg cable to the neg battery terminal. There seems to be a load discharging the battery...Any suggestions? The car can sit unused for up to 3 days at a time.

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2011 LEAF SL-e, white, floor mats, organization package, leased 9/17/2011. Turned in 7/3/14.
Jesla
2014 Rav4 EV Blizzard Pearl, leased 6/20/14
2004.5 Dodge Ram 2500 Cummins Turbo Diesel, 6sp manual


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 Post subject: Re: ALL POSTS - 12-volt battery replacement
PostPosted: Sun May 27, 2018 3:00 am 
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Joined: Mon Feb 24, 2014 8:51 pm
Posts: 623
rickrides wrote:
I did what Tony said and replaced my original battery, that was almost 4 years old, with the Bosch AGM in February. I've been getting air bag error messages for the last few days so I checked the voltage when I got home and it read 9.6 volts. I charged it to 14.6 and disconnected the charger and the voltage started dropping. I disconnected the neg terminal and the battery is holding at 12.75v. I get a pretty good spark when I touch the neg cable to the neg battery terminal. There seems to be a load discharging the battery...Any suggestions? The car can sit unused for up to 3 days at a time.


Mine did this. Was about 2 amp load that never shut off. Turned out to be the Gateway computer. You need to keep it on a charger or start pulling 12v fuses until the drain stops. Get it into the dealer asap.

BTW Carson Toyota would not work on my car with the larger Bosch battery. They told me it was draining because it was too large. (WTFH?) Installed a Toyota battery (over $200 my cost) and it died 2 days later. Towed to Irvine Toyota to get an actual technician to look at it. Three tows later Tesla decided it was the computer.

http://www.myrav4ev.com/forum/viewtopic.php?f=7&t=1775&hilit=drain


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 Post subject: Re: ALL POSTS - 12-volt battery replacement
PostPosted: Wed Jul 04, 2018 12:21 am 
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Joined: Sat Apr 19, 2014 12:57 am
Posts: 91
Location: SF Bay Area, Danville, CA
rickrides wrote:
I did what Tony said and replaced my original battery, that was almost 4 years old, with the Bosch AGM in February. I've been getting air bag error messages for the last few days so I checked the voltage when I got home and it read 9.6 volts. I charged it to 14.6 and disconnected the charger and the voltage started dropping. I disconnected the neg terminal and the battery is holding at 12.75v. I get a pretty good spark when I touch the neg cable to the neg battery terminal. There seems to be a load discharging the battery...Any suggestions? The car can sit unused for up to 3 days at a time.


I replaced my Bosch AGM today with another one under warranty. It tested bad at Pep Boys and they gave me a new one. It had almost no capacity. For being such a great battery, it didn't last very long.

I will continue to monitor the new battery to see if there is a phantom load draining it.

_________________
2011 LEAF SL-e, white, floor mats, organization package, leased 9/17/2011. Turned in 7/3/14.
Jesla
2014 Rav4 EV Blizzard Pearl, leased 6/20/14
2004.5 Dodge Ram 2500 Cummins Turbo Diesel, 6sp manual


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 Post subject: Re: ALL POSTS - 12-volt battery replacement
PostPosted: Wed Sep 18, 2019 3:51 pm 
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Joined: Wed Oct 30, 2013 3:44 am
Posts: 163
Location: Santa Cruz, CA
rickrides wrote:
I replaced my Bosch AGM today with another one under warranty. It tested bad at Pep Boys and they gave me a new one. It had almost no capacity. For being such a great battery, it didn't last very long.

I will continue to monitor the new battery to see if there is a phantom load draining it.

I just replaced my Bosch AGM under warranty as well. I started seeing the usual early warning signs of low 12V battery and its inability to hold a charge even though I’ve been keeping it on a trickle charger. However, my guess was that this was fallout from one year ago when it was accidentally left not connected to the trickle charger for several months while I was out of town and the battery was drained. I managed to reharge the battery but I had to pay a lot to the dealer to get them to reset the error codes. The battery held up for another year at least.

When I went to the original Pep Boys yesterday to exchange it under warranty, they were out of the Bosch AGM and gave me a matching Champion AGM – same four year warranty.

Now I see that thread linked above about the “gateway computer” pulling 2 amps while the car is off and needing replacement for some folks... I guess I’ll go check for that now.


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 Post subject: Re: ALL POSTS - 12-volt battery replacement
PostPosted: Thu Sep 19, 2019 8:20 pm 
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Joined: Wed Jan 29, 2014 10:40 pm
Posts: 46
Location: Oakland, Ca
My 3 year old bosch agm battery vaporized a couple of months ago.

I was on a 200 mile trip, using Chademo chargers

Noticed a smell while charging, steam venting out of the battery while charging after 100 miles.

I did let the car rest, battery cool before resuming the trip.

On the return drive, I would notice the smell whenever I was stuck in traffic, assume it was continuing to vent.

Pep boys tested the battery. It had 1 CCA on their test.

They replaced the battery under warranty, but informed me that I needed to have the charging system checked. The suggestion is the battery failure was caused by overcharging.

It's been working fine since, including a few 90 mile trips.

Reading on AGM batteries, I'm curious if there is a Battery Sensor Module than needs to be programmed for AGM.

https://www.knowyourparts.com/technical ... batteries/

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 Post subject: Re: ALL POSTS - 12-volt battery replacement
PostPosted: Fri Sep 20, 2019 2:46 pm 
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Joined: Thu Nov 02, 2017 8:57 pm
Posts: 43
Location: Salisbury, NC
Weekdayskier wrote:
They replaced the battery under warranty, but informed me that I needed to have the charging system checked. The suggestion is the battery failure was caused by overcharging.

It's been working fine since, including a few 90 mile trips.

Reading on AGM batteries, I'm curious if there is a Battery Sensor Module than needs to be programmed for AGM.

https://www.knowyourparts.com/technical ... batteries/



There is no battery sensor module. The Tesla gateway commands the voltage setpoint for the DC-DC converter; at 70 deg F ambient it's around 14.5 V, and will increase as temperature decreases. The DC-DC is only active when the vehicle is in READY mode.

Grab yourself something like one of these: https://www.amazon.com/gp/product/B01N00I4TM/ It's a quick and easy way to keep an eye on the 12V system health, at least within a tenth or two of a volt. If you see voltages much above 15V you may be damaging your battery, and voltages much below 13V would indicate the DC-DC is not working.


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