2002 s80 volvo-battery has been charged car will not start

That sounds like a low voltage problem. Charge battery (in the trunk) and clean cable ends.

If your security light is flashing leave the key in the on pos for 10 min and the light should stop flashing . when it does your car will start

Try disconnecting the negative battery cable for 10 minutes then reconnect it...verify that the battery is charging properly..sounds like the battery does not have enough cranking power..if he jumped it and it ran okay until you shut it off, the alternator is working properly, battery needs replacement...cheers.

Have you had it checked for leakage whilst off? Ask for a DC current leakage test from your battery whilst the key is removed. Leakage will result in the battery draining whilst off. If the test show a leak you will need to start/looking for electrical circuits / lights remaining on.

you have a short somewhere it kills the battery after sitting all night make sure no lights are staying on for example you glove box light if it doesnt shut all the way light could stay on and you dont even no it.

Have the charging system checked,Battery voltage(car not running) should be 12 volts,or less if battery is not fully charged.With engine running voltage should be close to 14 volts. use a dc volt meter and connect to positive and negative battery post.

Check charging voltage when running. It should be around 14 volts at the battery terminals. If not, even when revving, then change the alternator.

Then check the battery voltage at rest, a few hours after resting that is. The voltage shouldn't be lower than around 12.5.
You can double check battery condition by turning on the vehicle lights and cranking. If the lights dim significantly, then you have a dead battery and you will need to replace it.

SOUND LIKE ALTERNATOR NOT WORKING.FIRST TURN OFF RADIO TO KEEP FROM LOCKING IT OUT WHEN DISCONNECTING NEGATIVE BATTERY.REMOVE ALTERNATOR HAVE IT TESTED.BEFORE REMOVING ALTERNATOR MAKE SURE DRIVE BELT HAS NOT WORKED LOOSE OR BROKEN.

For now you can remove the appropriate fuse for the lights. Or unhook the negative cable on battery at night zo it wont drain your battery. But there maybe a short in your wires somewhere that you'll need to have checked out.

Tricky ... Was the alternator replaced with a 2nd hand one or a new one?

A defective alternator can allow the battery to discharge within a few minutes (the diodes in the rear of the alternator can burn out and cause the problem. The diode pack can be replaced). When this happens recharging the battery only replaces the power in the battery - which drains straight back to earth via the alternator, flattening the battery again - often within a couple of minutes or less.

Does the battery lose its charge when the car is standing or just when the engine is fired up?
If the battery loses its charge overnight, try disconnecting the wiring from the rear of the alternator (also look at the electrical connector that fits into the back of the alternator - look for melting/burning marks which suggest something may be amiss inside the alternator).

Let the car stand overnight with the alternator wires disconnected. Will it start up ok and drive (with the alternator wires still disconnected) the next morning?

You could also try just disconnecting the alternator wires, firing up the car and then driving it -
If the car drives ok without dying out and gets further down the street than it usually does, then it probably is the alternator at fault. The car should drive until the battery drains and has insufficient power to trigger the ignition. You certainly would get further down the street with a charged battery and disconnected alternator than you currently do.

It does sound as though you've had an alternator fault to begin with. If it has been replaced with a 2nd hand unit that unit may also be faulty. Rather than replace parts in desperation, visit an auto electrician's - within a few minutes they will be able to test the battery/alternator output and also identify where the lost current is going. It will be cheaper in the long run to have an auto electrician look at the charging system. It only takes a few minutes.