Well ,JB weld just gave it all up

got a side corner Crack down the side of the 12 volt battery. and i need a better epoxy for a good battery that took a fall too early in life .JB Weld worked good for a month or so .This morning my battery was down , dry cell! good ol battery acid rolled that epoxy right offand leaked the acid out
 
Haven't found anything that would stick to a modern battery case. I broke the lifting tab off a golf cart battery a couple years ago and tried everything I could think of to seal up the hole. It was in the top and only about 1/4" square. Managed to get it's useful life by resealing it every so often trying different epoxies and glues. Was happy day when I traded it in for a new one.
 
Years ago I had a battery get a hole rubbed in the case and I got some stuff from an auto parts store made just for fixing a battery. Do not know if you can still find it but at one time they made something like JB weld for batteries
 
(quoted from post at 09:19:41 09/22/18) got a side corner Crack down the side of the 12 volt battery. and i need a better epoxy for a good battery that took a fall too early in life .JB Weld worked good for a month or so .This morning my battery was down , dry cell! good ol battery acid rolled that epoxy right offand leaked the acid out

Some things are not worth fixing,..
 
JB Weld is not intended to repair plastic (or hard rubber) storage battery cases.

Dean
 
(quoted from post at 20:38:20 09/22/18) Don't laugh. Roofing tar will work as well as anything.

I won't laugh-Used roofing tar to repair lots of things.
Pump up plastic spray jug ---for one.
 
Try this trick.

Turn the battery to where the acid will not be on the crack. Clean the crack good and rough it up a little..

Take Baking Soda and sprinkle on the crack. Soak the backing soda with Super Glue..

When you add super glue to baking soda it will become so hard and bond to just about anything that you will need a hammer to break it.. Check into it. Baking Soda and Super Glue has been used for years to repair things. One being composite rotor blades on helicopters..
 
You would need to clean and roughen the plastic case of the battery and coat it with epoxy for plastic using it like fiberglass resin. While it's still wet rub into it some fiberglass cloth to re-enforce the patch and then put another coat over the top.

Not sure how well the epoxy would hold up to the acid but would last years otherwise.
 
Hi:
If I recall correctly, older style car batteries used to be nick-named "tar-top". The individual cells could be seen where they were set into the main molded black housing. There was a soft black stuff on top, filling the space between the outer main shell and the cell units. I feel sure somebody reading this thread knows what that tar stuff was, and whether it would hold well enough over a crack in a battery. Good luck!

Dennis M. in W. Tenn.
 

Napa/balkamp use to offer a RV plastic tank repair kit it worked on every plastic tank and battery I used it on. I can not find it all that comes up is this.

https://www.napaonline.com/en/p/BK_7651544

The kit I use to get came with reinforcement cloth and epoxy.. If you google it a kit will come up with the cloth its expensive but will do quite a few repairs...

Google

plastic fuel tank repair kit napa
 

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