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Can you get into the car ok and open the bonnet?
You can either use jumpleads and connect it to a power point under the bonnet or you could use a memory saver type tool to connect to the cigar lighter. This will provide enough power so you can use the remote to open the boot.
If you use the memory saver option you will need to turn the ignition switch to the on position if the cigar lighter normally works in that position. Some are 12v constant and some are 12 ignition fed.