12v battery failure, Unable to access frunk

[TomServo]

easy peasy -

 

[Gasaraki]

I have my new Oct. 2021 ...MF299xxx Tesla Model Y. I already know to replace my 12 volt lead acid battery soon with an Ohmmu.

However, I also want be able to get into the frunk if the 12v system dies. Getting in at home isn't the problem; I'm worried about getting in when I'm out stranded somewhere. So I'd wrap up a small battery and put it into the tow-hook compartment (where the frunk leads are). However, I've seen recent reports that a 9 volt battery doesn't work anymore -- Tesla is insisting on 12 volts. And I'd like to use lithium since they last much longer than an alkaline A23 12-volt battery. But I can't find a 12v lithium. Two 6v lithium would also do the trick but are hard to come by. Would two 9v lithium batteries in series work, or is 18 volts too much for the frunk relay?

I have to imagine that this is already a solved problem. Does anyone know of a solution to this issue that we all might run into some day?

Thanks,

Scott

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MYLR | Red ext | White int | 19" | 5 seats | tow | no FSD | made/delivered Oct 2021

No need to get lithium.

Amazon.com

That's what I have stashed in the hole.

 

[e645824]

Here are the piece-parts that I bought (see photos below):

https://www.amazon.com/dp/B08D74VWQK​

https://www.amazon.com/dp/B0036QL1JY​

I went with lithium because I just want to stuff it into the tow-hook slot and not have to worry about self discharge for many years. In about 7 years I'll remember to replace the batteries. Plus, my alarm system uses CR123 batteries so I already have a pile of them. I'll put it into a ZIP lock bag and attach it to the red/black wires. I put the gray wire nuts on (they aren't included). The box also has an on/off switch.

Scott

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MYLR | Red ext | White int | 19" | 5 seats | tow | no FSD | made/delivered Oct 2021

 

[android04]

Here are the piece-parts that I bought (see photos below):

https://www.amazon.com/dp/B08D74VWQK​

https://www.amazon.com/dp/B0036QL1JY​

I went with lithium because I just want to stuff it into the tow-hook slot and not have to worry about self discharge for many years. In about 7 years I'll remember to replace the batteries. Plus, my alarm system uses CR123 batteries so I already have a pile of them. I'll put it into a ZIP lock bag and attach it to the red/black wires. I put the gray wire nuts on (they aren't included). The box also has an on/off switch.

Scott

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MYLR | Red ext | White int | 19" | 5 seats | tow | no FSD | made/delivered Oct 2021

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Only problem I see with this is that it won't fit behind the tow hook cover (it might if you cut some of the high density foam around the hole). Have you ever looked behind the cover? The hole is about the same diameter as the tow hook threaded end. If you modify or cut into the foam and can get your battery box to fit, make sure to post some pictures.

 

[N54TT]

Only problem I see with this is that it won't fit behind the tow hook cover (it might if you cut some of the high density foam around the hole). Have you ever looked behind the cover? The hole is about the same diameter as the tow hook threaded end. If you modify or cut into the foam and can get your battery box to fit, make sure to post some pictures.

I was just going to say. Doesn’t look like that would fit behind the tow hook without some modifications. I have a bunch of cr123’s as well for my alarm and one of my LED flashlights. My other lights use 18650’s

 

[e645824]

Only problem I see with this is that it won't fit behind the tow hook cover (it might if you cut some of the high density foam around the hole). Have you ever looked behind the cover? The hole is about the same diameter as the tow hook threaded end. If you modify or cut into the foam and can get your battery box to fit, make sure to post some pictures.

It is quite cavernous in there. There is a small strip of black foam on the upper section that I removed, but otherwise there is plenty of space. Stick your finger in there and you'll see that the foam doesn't go up very far and it is easy to remove that small section. I have my battery box wrapped in a ziplock bag and I inserted it vertically in to the upper cavity. Here are some photos.

Scott

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MYLR | Red ext | White int | 19" | 5 seats | tow | no FSD | made/delivered Oct 2021