Now were name calling, And you've been here how long? My suggestion in the beginning was to buy a new battery, but that's not the answer you wanted. I can't believe how cheap some people are.
My daughter get's the best even if I have to do without.
I'm sure your going to put the patched battery in your truck, RIGHT?

 

Years ago they actually used to sell a kit to patch batterys. I never used any so I don't remember what was in them.
Yes heat might work but it is easy to over heat too. Those cases were probably RIM (reaction injected molding) process where the heat is generated by bushing the plastic through a small orifice. Just a wild guess.
I'd rather use some good epoxy than to start trying to "weld" the plastic back with heat.

 

Not wanting to be a jerk, I started searching this question. Everything points back to "Replace the Battery"
Here is one article I found for a temporary fix. At the end it says they replaced the battery.
All other articles I read stated that repairs are temporary and battery should be replaced.
Most articles say "Do not try this." Is your life worth the price of a battery? Would you really "Patch" your daughters battery?
Here's the article:

Let me preface this with a little "don't try this at home." What we had to do was dangerous and definitely a last resort. When you're all alone you have to be creative, but you must never sacrifice your safety. Remember expedition travel can be dangerous, and requires all of your wits and guts about you.
The Fix



Battery plastic can be welded (melted) together. Here we describe how to weld the battery hole closed.
If you have the handle to your battery, chances are it's the same type or at least compatible plastic with the battery case. The handle serves as your welding rod. We always have propane and a small torch tip with us in our box of tools, so we figured we would be able to weld up the hole.
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Batteries produce hydrogen gas. Hydrogen gas is very explosive, and this is what makes the fix so dangerous. Blowing a battery up is bad for the battery, but if you're anywhere near it you can get sulphuric acid on you, which can result in serious chemical burns. The following points describe the safest way to fix a hole in your battery:

1. Wear protective clothing. Put on pants, long sleeves, and find some glasses or something to protect your eyes. Wear gloves.
2. Place the battery on the ground, with the hole facing up. Place a board or something between you and the hole, leaving just enough room so you can reach around and see what you are doing.
3. Clean and dry the battery around the hole with a rag.
4. Cut a piece of the plastic handle that is just larger than the hole.
5. Heat up the donor piece so that it is melted on the side that will go against the battery.
6. While the plastic is still hot and melted, place it over the hole. It will partially bond with the battery.
7. Now comes the dangerous part: you have to complete the bond. Do this by taking a section of the handle and melting the end. Quickly, lightly feather the battery around the edges of the donor piece to heat up the area. Dab the heated area with the melted handle end. You have to go back and forth a bit to keep the handle section melted, while keeping the battery plastic just hot. During this stage you run a serious risk of igniting hydrogen gas, blowing up the battery, and burning yourself.
8. Once you are satisfied that the hole is closed, turn off the torch and turn the battery right side up. If it's not a sealed unit, fill it up with water. Replace it in the vehicle, cross your fingers, and hope that it starts.

That's it. This fix worked for us - it's a true story, and was one of many that were less than ideal. However, it got us running again, and as soon as we came to a town with supplies we replaced the battery with a new one.

 

After posting them videos yesterday I went out and gave it a rip. It was easy. I didn't use a torch since I know batteries give off gas. I used a soldering iron. It only took about 10 minutes and is solid. Super solid as a matter of fact. I cut a small piece of black plastic the size of the hole from a plant pot. I tacked it in and then melted it together. Then I put a bigger patch over that and a third over that.

No leaks.

BTW, the battery acid in this battery isn't very corrosive. My whole life I have heard how corrosive the stuff was and to be careful. It was barely corrosive enough to clean dirt off the concrete. Saturday morning when she and I went out to assess the front end damage (she loves working on cars), there was fluid on the ground. I assumed it was coolant and wiped my fingers through it to smell it. It felt slightly slick and oily and had no smell so I knew it wasn't coolant. It took about 5 minutes before we saw the hole in the battery. First thing I did was get a 5 gallon bucketful of water and rinse everything off including my fingers. No burns at all. My fingers were fine. The concrete has a five foot by 4 inch clean spot though.

Just thought I'd share that with y'all.

And gangstakr, yes I put it back in her car. We live on the edge around here like James Bond. You can calm down now. This is how we roll.

 

Do not take shortcuts. Granted batterries are plastic but all components are made seperately, then assembled. Why risk your skin, your eyes or your life trying to patch a battery.

 

I guess I don't see the risk nor the shortcut. Throwing it out and getting a new one woulda been the shortcut.

Like I said, I wasn't gonna use a torch but then I realized that I could get a soldering iron and cover the hole with the plastic patch. I did use safety goggles as a "just in case" measure. It was a snap. And did you read what I posted about the battery acid? It doesn't even burn.

But I will post this disclaimer: "DON'T TRY THIS AT HOME."

 

May your repair hold forever. But do not underestimate the power of battery acid. Take a drop and put it on a piece of steel and watch. Many a pair of jeans have ruined and metal battery trays are one of the fastest parts to need replaced.

 

It should hold forever. I think the half-life of plastic is like a trillion years.

And in no way would I underestimate the power of battery acid. I wouldn't rub it in my skin or rinse my eyes with it. I was just shocked that it did nothing to my fingers.