My battery has died and I cannot get into my trunk to jump it but, I also can't leave it to trickle charge over night or longer. Is there any way I can remedy this situation without potential damage to my car? I am able to trickle charge her for around 7 hours would this be sufficient?

Thank you,

 

When you say your battery "died", do you mean it has discharged due to leaving something on, or not running the car for a while? If it has failed,no an=mountof charging will fix it.

And why can't you get in the trunk? I assume that means your trunk key mechanism is jammed. If so, you really ought to fix that with some lubricant so your are not in this situation again.

Anyway, lift the hood look for the connection in the picture. Hook the plus lead from your charger to the connection and the minus to the chassis and, if your battery is still good, you can recharge from there. As to the time, that depends on what current your "trickle" charger charges at. I would guess you need about 10 amp hours to have a good chance of cranking a warm, easy starting XJR.

You should be able to open the trunk after an hour or less of charging.

 

Yes the car hasn't been started lately and the battery has "died". I have it trickle charging right now at 2 amps, but I am not so sure I will be able to get a sufficient charge within my time constraints.
How long would you expect it to take to open the trunk at a 2 amp trickle, and am I right in thinking i will be able to jump it once I can access the battery?

 

You can 'jump' it to another battery at that connection point but is suggested that you not try to start it from there. Connecting a battery there should open the trunk and yes you can 'jump' it from the battery.

 

At what amperage would it be safe to jump the car from the charging points under the hood to access the battery using a battery charger?

 

jump starting from the illustrated junction is entirely feasible.

in fact, the junction is part of the circuit that leads to the starter so it is
carrying no more or less current than it other wise would.

the trunk solenoid should be operable as soon as a charger or outboard battery
is connected at that point. it does not take much juice at all.

 

A lot of the time, a completely flat battery indicates an internal failure thats made it self discharge. Also, a discharge to fully flat can often kill even a good battery. Personally, a completely flat battery means a visit to the battery shop. It'll never be right again.

Still, you might be able to charge it enough to get the trunk open, short term. Whether itll hold a charge long term is another matter.

 

The lube set in and unfroze the lock, I got the trunk open. Thank you all, for all of your assistance and knowledge.