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My 2c on this is that yes, you can put a charge on the dead batter, either by boosting it or connecting an actual battery charger to it for a time. But here's the thing. You then don't know for sure if it will even hold a charge for long. You might get a vehicle started with that battery, drive somewhere, then find at some point your car won't start.... again. It's a potential headache waiting to plague you.
The better way to go would be to do like someone said. Remove the battery, take it to a service station/center, get them to put a charge on it and make sure they TEST it as well. Once you know it's a still a good battery in every way only then do you bother putting it back into a vehicle.
And if the test shows it's a dud, chuck it and buy a new one. And if you do buy a new one don't go with the cheapest cheapass one. Get a decent one that comes with some sort of guarantee. Doesn't have to be the most expensive one either, just a good medium-priced one that does what it's supposed to for as long as it's supposed to (or longer).
Btw I don't know where you live but try having battery problems in the middle of winter on the Canadian Prairies. It's a whole new world of hurt on top of the usual frustration let me tell you.
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