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 Post subject: Replacing 12V battery
PostPosted: Sat Nov 03, 2018 10:39 pm 
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Joined: Thu Jan 19, 2017 9:35 pm
Posts: 10
I have a 2013 RAV 4 EV which has the original Toyota 12V battery (5+ years). I have been reading the RAV4 posts and it seems as though it might be a good idea for me to replace it even though there is no current problem. I ordered an Optima Yellow 35D online and will getting it in a week or so.

I thought I might hook up a jumper cable from the new battery to the battery terminals (off to the side of the post area) then take out the old battery while keeping the new battery 12V system connection live as I hook up my new battery to the terminals. I thought this might avoid canceling out all of my current system settings.

Does anybody see any problem with this?

Thanks for any help,
Jim

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Juice Box 40A 10kW portable NEMA 14-50
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 Post subject: Re: Replacing 12V battery
PostPosted: Sun Nov 04, 2018 5:58 am 
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Joined: Mon Feb 24, 2014 8:51 pm
Posts: 585
The method is good. Replacement... sooner the better.


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 Post subject: Re: Replacing 12V battery
PostPosted: Tue Nov 06, 2018 3:45 am 
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Joined: Mon Aug 07, 2017 4:55 pm
Posts: 95
Location: Duvall, Wash.
Disconnecting the 12v battery causes no harm (except the short list of things that reset: GOM, navigation state, saved charge schedule, etc.).

Trying to use a failing 12v battery seems to be where people get into trouble. The 12v system goes into abnormal low voltage territory, the DC-DC converter tries to compensate, trouble ensues.

I would not worry at all about disconnecting the 12v battery to replace it. It was even the official JdeMO reset procedure until recently.

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Regards,
Al Savage
2014 Rav4 EV, Shoreline Blue Pearl, #2609, first use 04Jun2014, 49k miles (Aug2017), OpenEVSE 40A. First DU replacement May2018 59k.
2018 Model 3 LR AWD, blue
1999 E300 on B100 (sold Sep2018)
http://nissandiesel.dyndns.org


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 Post subject: Re: Replacing 12V battery
PostPosted: Sat Nov 10, 2018 11:33 pm 
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Joined: Thu Jan 19, 2017 9:35 pm
Posts: 10
Thank you for the feedback. I will check to see if there is anything that needs to be re-set. My battery finally arrived and I found that the Optima 35D battery weighs much more than the original battery. But they do provide a spacer for it to fit better with the top clamp.
Jim

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Juice Box 40A 10kW portable NEMA 14-50
3 kW micro-inverter PV solar system


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 Post subject: Re: Replacing 12V battery
PostPosted: Tue Nov 13, 2018 2:34 am 
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Joined: Thu Jan 19, 2017 9:35 pm
Posts: 10
Got the battery installed. Have noticed that the GOM when the fan is turned on is a good 30 mi. different than the estimated range on the right side display. Turn off the fan, and it jumps up the 30+ miles and matches the other range readout.
Any suggestions of what is going on or how to get it back to normal? With the old battery there was only about a 3 mile difference.

By the way, a few tips for others considering a yellow top Optima battery:

-It does come with a spacer to raise it up to the proper height. Toyota has a clamp that has very little leeway to adjust. Had to split the width on the two top edges of the clamp that hold down the battery.

-The negative terminal is also very tight. Barely could move it aside to exchange batteries. The positive side has more flexibility so I had to slip the new battery in from the left side.

-The first time you turn on to start, it will take a minute or two for the system to re-boot. Don't expect to just drive immediately.

Jim Knight

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3 kW micro-inverter PV solar system


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