Hi the only thing i can think of is running a set of jump leads from another battery to your cars battery connections and then taking the other battery away and then replacing it with the new one all the best Donald.
Advise that you be VERY VERY careful in jumpering a second battery across as there are some horrendous tales of zapping dashboards, ecu's etc when changing or jumpstarting a batery. You can get a plug in gadget that plugs into the cigar lighter thqa will keep the radio from losing it6s code but maybe someone who has tried this can help.
I did mine with jumpleads to a good battery sat on the floor.Worked a treat had to be careful the jump leads didnt jump:rofl: off those crappy terminals though.(cut them off on my Lags and replaced with good old bolt ons)
I probably wouldnt have done it if I had thought about killing my dash:crazy:
Changed battery OK but lost the radio code in the process - I turn on the side-lights first then connect donor battery - jump in the car switch off lights - then start - this eems to reduce the risk of a spike in voltage and only jump from a fully charged battery that isn't connected to another vehicle. All I gotta do now is get the code sorted.