Yes, you sure can.
yes
You can start a car without a battery if you hook up a jump pack or use jumper camples but it could fry your alternator. It is pointless to charge a car without a battery. When you charge the car you are charging the battery.
WELL YOU MAY HAVE EITHER A BAD ALTERNATOR/CONECTION OR YOU ARE DISCONECTING THE NEGATIVE SIDE OF THE BATTERY FIRST. TRY DISCONECTING THE POSITIVE SIDE FIRST IT SHOULD THEN STAY ON.
can i re charge my battery without unconecting the battery on my s type jag
No, because you need a battery to run your car. Doing so can ruin the alternator.
You cannot charge a battery without a battery charger or having it charged by the alternator in your vehicle while it is running.
There is no safe way to charge ANY battery without a charger rated for that particular battery. You could easily destroy the battery if you try.
Absolutely.
You can't update a psp without a working battery. It'll state that the battery is low and you need to charge it.
Try disconecting the battery for 5 min.s and reconecting.
Hook it to a battery charger.
There is no safe way to charge a phone without a charger made specifically for that phone/battery