V8V dead flat new battery

[aspidito]

I just changed the original battery in my 06 V8V & hooked up a spare battery to the under bonnet post but still lost all power.
with new battery fitted I had to reset drivers window but lost all power to passenger door (mirror & window) after a bit of research It seems this is not uncommon & removing/replacing fuse #82 may fix it (#83 for drivers side).
As the car is currently unregistered I left it for later & now 4 weeks later the new battery is dead flat & charger will not go to charge mode...any ideas please.

[Ken Figenus]

Could be a tracker draining it? New battery should last up to a month I'm sure - as long as there is no significant drain.

[Jon39]

Not an electrical expert, but this might help.

If the charger you refer to, is the AM or CTEK trickle charger, then perhaps they do not function when a battery is completely flat.

Have you tried using a conventional charger?