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If all your connections are clean and sound, then your car should be able to run without a battery. Start the car and disconnect the negative terminal. If it stops your alternator is faulty. This would explain dim lights that are draining the life out of the battery instead of being alternator driven. Same as the dieing while driving, the battery can't keep supplying power forever without being recharged by the alternator.
If the alternator is ok, the battery needs replacing. Repeated draining of batteries kills them.
The alternator may not be charging the battery. Jump start it, and use a volt meter at the battery, red lead to positive and black to neg. The meter should read between 13 and almost 15 volts, any lower than 13 volts, the alternator is no good. (this is done with vehicle running).
first to remove the corrosion from the batteru terminals, pour a coka cola on it- it has to be coke- the acid in the coke should take care of that problem. Next you may need to replace the alternator. Hope this helps you :)