i just noticed this +ve symbol on the cap under the hood. Can it be used to charge/condition battery ?

 

I don't see why not.....

 

It should be a direct connection to the battery, so yes.

 

That's how I charge the battery on my 2007 V8V

 

Per manual on my Virage, I have charged the battery using this as the positive post. However, I use battery maintainer plugged into 12V outlet in truck to maintain charge.

 

Thats the jumper cable connection point for a jump start .
I use trickle chargers on all my cars during long periods of non use .
I connected my trickle charger to a similar point on my 07 Vantage and it wouldnt charge .
I use the convenience socket in the trunk and its fine .