My mercedes sat for 10 months while I recuperated from injuries. The battery was completely dead. Remote didn't even work. We were able to jumpstart it with battery cables but it won't keep running. Dead as soon as you stop. I put a battery charger on it overnight and drove it off and on for a couple of weeks. Then it sat another 3 months. Same again- dead. Do you think jumpstarting it is not enough and I need to let it charge all night again? Is this normal?

check fuses and relays --if sat for 2 months test battery probably dead --try to start with a boost then test battery

Key fob battery dead?

ANTITHEFT PROBABLY . THE CAR NOW THINKS IT IS BEING STOLEN. CLOSE ALL DOORS AND TRUNK HOOD ETC . LOCK CAR WITH THE REMOTE FOB THEN REENTER AND TRY AGAIN

The anti-theft system is likely the problem. It needs to be reset.

Yes, you will be able to jump it. Yes, you will need a new battery. Yes, the battery will drain completely - actually, if you have at least an alarm system active , it will completely drain in less than 2 months.

Is the car immobilized? if so you may have to lock and unlock the car with the key and not the remote.

Is it turning over or just nothing, also starter motor may be jammed. put the car in gear with the hand brake off and push the car forward until you feel the engine turn over. You dont need the keys in the car!

This should free the starter off, sometimes they jam very tight and will not move at all, on these jags. they get rusty quickly if sat about. I had a XJ many years ago great motors.

Good luck.

sound like a fault in dvd player.its running battery down.have dealership check it out.sound like a electrical problem.

Always clean the battery terminals before jumping. An extremely dead battery may not accept a jump as it serves as a 'buffer" instead of helping. If you do get it started, charge battery with a battery charger then have alternator and battery tested for proper operation and check belt condition and tension as well.

Posotive can be found in hood driver side next to fuse box. It is a small rectangle box. You can hook negative to any solid ground on the car.

i need help in jump starting 2006 cls500