Is my vehicle battery no good anymore?

The alternator is not a battery charger. Chances are you have a dead cell or two. Best test is to take it to any auto parts store, let them charge and test it for a more accurate answer.

My belief is it is dead. Jump starting and continuing to use it risks damage to your alternator.

Clean battery posts and assure yourself of tight fitting fixtures. Test voltage while in machine, not running. Start engine and test again, noticing standing voltage both times. If voltage is elevated after engine start, charging system probably good. If battery doesn't start engine after a distilled water cell -check- and charge, you probably need new battery. Don't over fill battery.

Maybe. But I have no way to test it with my computer. Go to a shop and have that done.

Lead-acid batteries don't like to sit unused, especially if the vehicle has a computer. If it does, the computer in "sleep" mode, will slowly run the battery dead. It might take a month or more, but it will run the battery dead, unless it's a very new vehicle that disconnects the battery if it's voltage starts getting low.

A sitting lead-acid battery will also sulfate coat its plates if there is no use, but it takes numerous months. Once the battery is sulfated, it is no longer usable.

Next winter use a battery tender, that keeps the battery charged.

-Engine overhaul mechanic and electrical system expert, since 1972

Once dead the battery will freeze and be ruined in the winter.

Take it out and test the voltage - if a cell or two are dead, try to charge the battery with some smart charger. Such chargers can 'jump start' a battery, and bring it to life. But, even if such charger manages to 'revive' the battery, it will not last very long - perhaps till the autumn.

IMHO, take the battery out, test it, if it is good, recharge it fully, if not get a new one...

Letting a battery sit out discharged will freeze the battery and ruin it every time.

take to the autozone they will tell u good or no good.

Idling won't charge a battery. Enough said.

Uhm, how am i supposed to answer that? What is it doing? What year is it? have you tested it??