BG, the next time you have battery trouble.
As long as the cells are not shorted, or have broken plates.
You can crush an Aspirin, and pour it into each cell, the slow charge the Battery till it's fully charged.
Then hope for the best.
I've done this many times over the years, and it works about 90% of the time.
They may last the rest of the season, or allot longer.
The last one I treated was in my kids car, last spring.
It wouldn't charge up, let alone crank the engine over.
I treated it, and it is back to life, and still being used.
It's over 6 years old now.
Hopefully your oil leak is nothing more another hose.
A new PS pump, can get to be a few hundred dollars.