V70: Electrical No life

[Jamesbikes]

So my v70 d5 2008 has been sat for a week, i went to start it yesterday and.. nothing. Literally nothing, no interior lights hazards, nothing.
Took battery off, put it on a charger and charger said full, i left it maybe an hour while i did other stuff, put it back on the car, hazards flashed, and it started like nothing had happened.
Same today, no life whatsoever, battery charger says battery is full,10 mins later put a spare leisure battery on and fired right up.
Now i know that the charger could be lying and battery might be toast, but i'd at least expect to see a glow from an interior light or something, especially when that same battery starts it after an hour on a trickle charger.
Is there something on the car that shuts everything down if the voltage is a bit low?
Or is removing the battery just resetting something on the car?
(Anyone in uk want a cheap d5?)

[Pidgeonpost]

Does your battery charger show the actual voltage of the battery or maybe you could check it across the terminals with a voltmeter? I'm no auto-electrician (thanks Google), but from what I gather, your battery needs to show about 12.6v to be fully charged, while 12.4 volts represents 75% charge. If it's 12.2 volts it's only 50% charged, at 12 volts it's only 25% charged, and the car may start shutting down some non-essential functions. Still slightly odd behaviour.

[Simmy]

at this time of year battery's die replace it and all will be well its a well known fact that Volvos don't like low battery conditions if its low it will cut all things off to the car to safe guard all the electrical modules.