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You can connect the battery from a car to the depleted battery using jump cable. If the car is running then both will be fully charged given time. If the car is not running then the depleted battery will be charged by the car battery until the voltage is the SAME in both batteries. That is, half of the energy is moved to the dead battery. It may be enough to start the car.
If you don't have the money to buy a charger. You can do these.
1) find a AC to 12v power adapter in your electronic equipment collection and use it to charge the battery. It will take a while but it will work.
2) go to Craigslist and look for non working UPS under computer section. Most have a bad battery and they are sold for dirt cheap. The charging circuit is still good. I picked one up for free and/or for $1. Open it up and swap in your depleted battery. Plug the unit in and it will charge the battery.
Good luck.
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