Flat Battery Advice - getting the bonnet to release?

[Loteuk]

Left the car in the garage for a couple of weeks without the trickle charger connected. Forgot to disconnect the camera and the battery is now completely drained. Have tried to trickle charge it but no success. Fitted the charger to the pull-out in the mat well (and earthed tot he door hinge and still no success.
Of course I put the key in the ignition (why would n't I) so that s stuck (PDK)
Any ideas on a way forward to getting the bonnet up and access to the battery.
All was perfect with the battery before this issue

thank you in advance

[Polome]

Had the same problem.....leave the slave battery on the fuse box cons for a few minutes and use the key fob button to open bonnet. It's worked for me when the normal bonnet opening switch didn't....good luck.

[Loteuk]

Thanks for the advice, will check it in the morning to see if its got enough to open on the fob.....
reading on the net (mostly American posts) if the battery goes flat completely, it causes a resistance to charge, hopefully this is not the case.

[blueSL]

It's certainly true that if you let a battery go completely flat, you get difficult-to-reverse changes in the battery chemistry which effectively writes the battery off.

The trickle charger may not be able to supply enough current to make things work and an intelligent charger may not even switch on unless it detects something like a battery at the other end of the wires.

You need to use a spare car battery, borrowed from a friend's/wife's/employee's car. If you know what you are doing, you can also use a lithium-ion battery pack from a cordless drill using a 12 or 14.4v battery pack.

With the battery connected, you certainly need to use the remote to open it, not the switch in the car.