I have unscrewed the terminals but cannot remove the battery. do i need to loosen any else to be able to lift the battery out? audi is quoting an arm and a leg for a new battery. can i use aother commercially avaialble batteries?

Some models of Combo Van will need you to remove some pieces of body trim to get to the battery more easily. These are usually held in place with screws or 'push in' clips.
Loosen the nut on the clamp on the Negative, (black), terminal and remove the clamp. Next loosen and remove the red positive clamp from that terminal.
Next look down all four sides of the battery. Your looking for a bolt head and clamp holding down one edge of the battery. Unscrew this bolt until the clamp is loose. This should release the battery enough for you to wriggle it out. In some cases you might have to remove the clamp to get the battery out.
To refit, position the new battery the same way around as the old one. Tighten the clamp that's down the side to hold down the battery. Refit the RED (positive) terminal first and tighten the nut, then refit the BLACK (negative) terminal and tighten that nut as well. Refit any trim and test start the engine. Hope this helped?

Open hood, battery on the left facing car. Remove negative (black) battery terminal first then positive (red) terminal last. Loosen or remove hold down bolt and fitting from long side of battery. Lift from vehicle. Installation is reverse of removal.

MARK THE POSITIONS OF THE WIPER ARM ON THE LIFT GATE GLASS,THEN REMOVE WIPER ARM COVER AND NUT AT THE OUT SIDE LIFT GATE, THEN THE BEZEL.BECAREFUL DONT DAMAGE PAINT.ON THE LIFT GATE.AND REMOVE THE UPPER AND LOWER LIFT GATE TRIM PANELS.DISCONNECT THE ELECTRICAL CONNECTOR AT THE REAR WIPER MOTOR, THEN REMOVE THE TWO MOUNTING BOLTS SUPPORT WIPER MOTOR WHILE REMOVING BOLTS.THEN INSTALL NEW WIPER MOTOR AND PUT EVERY THING BACK IN PLACE VISA VERSA.

LOOSEN AND REMOVE WIPER ARM NUT.THEN REMOVE WIPER ARM BY ROCKING MOTION SHOULD COME OFF.

Disconnect negative terminal (black) first. Then disconnect positive terminal (red).

Then, use a 1/2" hex socket and extension and ratchet to unscrew the hold down bolt that holds the black plastic hold down piece on the bottom of the battery.

Remove any cross members that block the lifting of the battery out of the battery tray, by unscrewing any bolts that are located on the plate.

1. Disconnect the battery terminals from the battery.
Loosen the nut on the NEGATIVE (-) terminal first. You may need to expand the terminal to get it off the post.. you can use a screw driver to gently pry it wider.
2. Disconnect the positive next... same procedure.

3. There is a battery hold-down that needs to be unscrewed. Look down the front edge of the battery. There should be a small plastic or metal clamping plate that is screwed down. Remove the clamp.

4. Carefully lift out old battery,

5. Installation is just the reverse... be sure to attach the positive terminal first..(just for safety's sake)

to help you out..

(1) Loosen screw on negative ( - ) terminal clamp, lift negative cable off terminal, and put cable end somewhere where it can't touch the battery. This stops the positive terminal from being "live" with respect to the rest of the car.

(2) Lift plastic cover from positive ( + ) terminal. Loosen screw on positive terminal clamp, while making sure your screwdriver is nowhere near the negative terminal at all times. Lift positive cable off terminal, and put cable end somewhere where it can't touch the battery.

(3) Loosen the butterfly nuts over the clamp that holds the battery to the tray. One butterfly nut will have to come off completely, the other can stay on so you don't lose the clamp down the middle of the engine. Swing the clamp off to one side.

(4) Lift the battery out of the tray, keeping it upright at all times.

To reinstall the battery, follow the above steps in reverse order.

If it's the side mount terminals, there is a small bolt that is in the center of the terminals, just unscrew them.

I agree. Replace the battery first. It's under the back seat, which will lift up after undoing two screws in the front of the bottom of the seat. Remove negative terminal, remove positive terminal, lift old battery out, put in new one, attach positive terminal, attach negative terminal, reinstall seat, and you're done.

If that's not the issue, you may need to replace the alternator.

• Loosen the battery negative terminal clamp.

• Use a terminal clamp puller to remove the negative cable.

• Loosen the battery positive terminal clamp.

• Use a terminal clamp puller to remove the positive clamp.

• Remove the battery hold-down hardware and any heat shields.

• Remove the battery from the tray.

• Install the new battery into the tray.
• Also install the hold-down hardware.

• Install the positive battery cable.
• Then install the negative cable.
• When installing a battery, be careful to observe the correct polarity. Reversing the cables destroys the diodes. Proper polarity must also be observed when connecting a booster battery, positive to positive and negative to ground.

Art courtesy of Delmar - Thomson Learning.

• Coat the terminals with corrosion preventative spray, then check the job by starting the car.