So this is an interesting one... I came home and heard a faint squealing in my garage. Sounded like a siren. Traced it to the Vantage's alarm in the garage... it's been under its cover and plugged into a trickle charger (plugged into a cig port in the trunk) since like, early November.
Tried to unlock it with the remote, no dice. I keep the trunk "half closed", and the button on the decklid to release it fully doesn't work... won't do anything.
The CTEK trickle charger indicates it's charging, but obviously she's dead.
Somehow the alarm shut itself off as I was hitting buttons on the remote aimlessly... but got in and tried to get the accessory on, no dice.
I discovered a jump point under the hood, which obviously released, so I connected the M5's trickle to that jump point and going to let it sit a bit and see if I can get the doors to unlock/etc.
Grumble.