Any suggestions how to break in to my own car?

Honestly, 8 AA batteries in series would probably provide enough juice to open the central locking, but perhaps you have a mate who would call round so you can connect a length of twin and earth up to his battery

It'd also give you someone to shout "right, pushthe unlock on the fob now" to :)
That would be handy but I might have to wait a while to get someone to come over. But as my torx keys and VW jack are in the boot I might need a few days to get all the bits I need. :)
 
No, use a proper battery, or a jump pack - but make absolutely sure you get the polarity correct. Negative to body/engine.

A charger, can be of two types, neither much use. The older type, will put anything up to 20v volts out, and could wreck the car's electronics. The more modern type, will not output any current, unless they see a battery connected.
Good job I didn't try it then.
 
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