my car's battery is dead after long vacation?

could have been you left something on that drained it try a jump go to someone you trust to check it

Keep it, try to take it in the shop

Try recharging it. You should always have someone start it like once a month and let it run for five minutes. Also wise IF you live in a state where winters get cold, to run the a/.c once in a while just to keep it from sticking come Summer.

Jump the car and drive it for at least 1/2 hour. Try to start it up again when you get home and turn it off. It should have enough juice to work, but if it doesn't, charge the battery on a slow charger. Have it load tested to see if it will hold a charge. Old batteries that are allowed to run down usually suffer internal damage and loss of capacity- they need replacing.

Jump start it and take it for a run. If it starts afterwards fair enough, if not buy a new battery.

Make sure you turn on all the lights and heater blowers before you jump it to prevent a power surge.

You can try to jump it but I'd bet some or all of the cells are dry.

Buy a battery charger and recharge the old battery. IF your battery will hold a charge, it's considerably cheaper than buying a new battery.

You can jump the car and it will probably start. Buy yourself a low cost battery charger and charge it overnight at a low rate (about 10 amps). Then, if the battery won't hold a charge for a week, you'll have to get yourself a new battery. A good battery should be able to start a car even after a month or two of sitting around.

Charge it using a charging device on a slow recharge over 24 hours.

no thats dead, you could charge it by connecting it to power cables for like 24 hours or some but its probably better just to buy one