1996 jag xjs , the battery is dead , I need to jump start it but the trunk won't open ,battery in the trunk , can it be jumped from under the hood ? and why won't the trunk open even with a key ?

open glove box, read the users guide
if lost it is free from JAG dealer.
it cover all that.
and yes all cars on earth , the battery can be changed
with no damage done. for sure,100%
but you need to read the manual first.
and remove NEG LUG first
first off , last on.
cars with rear batteries have special rules for JUMPS
do not fail to read the manual or damage will happen.
cars with rear battery have a way to open trunk with battery dead, (all do) some are behind rear seat access others a cable latch lever to trunk lock.
SOME HAVE HOOD UP , JUMPER POLES

best is ask here, the manuals are hens teeth now. users. or buy one on line from scalpers.

https://www.jaguarforum.com/search/47893/?q=XJS+BATTERY+DEAD+HELP&o=relevance

Use a slave battery and suitable leads or a jump starter to energise the car via the cigar lighter or by accessing the battery lead to the starter. Some vehicles with a boot or in-car mounted battery have a jump starting point in the engine compartment.

So you have no other option but to jump start the car, by finding power cables in engine bay or pribe open the trunk with a crow bar, or have i towed to a auto shop so a professionel locksmith can open the trunk for you.

Look for red pos jump point under hood hook pos jump cable to it neg to block ur car will get power from jump car n u can open trunk

Hi Wly, Jump the battery with one from another vehicle. If the battery is in the trunk there should be a jump connection under the hood. Never having seen one of these vehicles I don't know where, but I'm sure you can fin it. Connect the batteries positive to positive, negative to negative and then start up, but before disconnecting turn on the lights and the climate fan to full. If its the hard top also turn on the heated rear window. This is to alleviate the possibility of a surge damaging the control systems of the car....You may like to pass my home and let me have a drive? maybe not, I live in Africa! Regards John

You do not need to access the battery to jump start your 7 Series. There is a metal terminal under the hood for jump starting your car or jumping another car. It is located near the passenger at the rear and has a red cap with a PLUS symbol on it. Remove the red cap and attach the postive side of the cable. Attach the negative side to the large nut just to the left.

Also, to open your trunk manually insert the metal key in the key hole next to the button that you push above your license plate.

Hi Your S class has two batteries. The smaller one is located in the engine bay, and the bigger one in the boot (trunk). No need to access any of them, simply open the door with key, insert key to start engine, you will notice that not all ignition lights will come on, but the engine WILL start, and the batteries will be recharged after a short while.

jumper lead point under bonnet

The battery is either in your trunk or like the xj8 which is under the back seat, and yes you can jump start it when you locate the battery.
hope this helps
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jump start the car or charge the battery from under the bonnet(hood) ,look for a plastic cover on the firewall with a big + on it negative is the engine