No. The battery will only last about half an hour after it has been fully charged. It's the job of the generator and voltage regulator to keep the battery charged while you're driving. You could have a bad battery, but given your description of the symptoms, it sounds like the generator isn't working. It is commonly called the "alternator", but that term is actually copyrighted by Chrysler, the manufacturer that developed it. Everyone will know what you mean when you say "alternator", but to be correct, the industry-standard term is now "generator".
The first half of the diagnosis is done with the two voltage measurements I mentioned previously. If you don't have a digital voltmeter, Harbor Freight Tools has a perfectly fine one for about seven bucks. I can tell you how to use it for these tests. You may need to charge the battery with a home battery charger before taking the measurements. The readings are only accurate when starting with a fully-charged battery.
Monday, June 9th, 2014 AT 12:38 PM