1997 C320 Battery is dead and trunk won't unlock, so we can't get to it to jump. Is there an emergency manual release of the trunk?

To open the hood of a 2004 Chrysler Pacifica with a dead battery, try these steps:
Find hood release lever: Usually located on left side of driver's footwell near the hood release cable.
Jump-start battery: Connect battery to another car's battery if it's completely dead. This will provide enough power to release the hood latch.
Use manual release: If jump-starting is not possible, consult owner's manual for manual release location.
Get help: If unsuccessful, call for help from a tow truck or mechanic.
Caution: Make sure the car is in park, emergency brake is engaged and engine is off before opening the hood.

if the battery is completely dead... there is a way to open the trunk from the inside. it involves putting the rear seat down. in the middle under the back window theres an emergency rear seat release. lower the seat, and then pull emergency trunk release on the top of the trunk door. hope this helped.

Are you asking for the release if you are locked in the trunk or is battery is dead, not sure what emergency release you are asking about for the trunk, if it is the one inside trunk if you are locked inside then this year does not have one

get a cheap jumer wire that has a cigar lighter plug in on each end. Most auto stores have them cheap. That will give you power to open trunk.

or hook a 9 volt battery to cigar lighter socket.

connect jump leads to starter motor large terminal and engine earth then the button should open the boot .

There are very specific battery jumping procedures in the cars smaller maintenance book as opposed to the larger owners manual. Provided you can open the trunk to access both batteries. There is also an emergency starting procedure to use the main battery instead of the starting battery to start the car in the owners manual. If both batteries are exhausted this emergency procedure will not work.

Jumper cables work per the procedure in the manual - portable quick start devices such as ones the auto club use to start a dead battery did not work for me on this car - they had to hook up jumper cables as indicated in the manual to successfully start.

The drivers side AGM battery is specific to the car and can be purchased (likely special order) at any Volkswagen or Audi dealer (maybe Porsche also) - the passenger side starting battery is more generic and can be replaced with a variety of batteries provided they meet the same specifications as the OEM battery.

Make certain any shop that changes the battery is familiar with the battery safety terminal disconnect procedures as if they accidentally trip this device it severs the battery cables using a compact explosive charge.

you can pop the trunk by oppening the hood and connecting a battery charger or jumper cable to the jump starting post and then opperting trunk button
or fold bown the back seat and crawl through trunk and pull the release handle at the trunk latch

first get new battery,then see what happens?

need to fold down back seat and pull the emergency cable located near the key hole

Correct, the battery is in the passenger footwell under the aluminum plate. It is perfectly fine to charge the battery here, but it is not recommended to jump start. Also, it is possible to get in the trunk without having power. There is an emergency release pull tab under the drivers side dash. Quite easy to use, actually I normally use this in lieu of the normal electric release.