Tow Electrics charger adapter
 

Kept getting Low Battery on my recently acquired 2013 XC60, D5, and although it wasn't really a great problem it was a nuisance having to remove the panels to gain access to the battery. And a short time ago I learned about charging the battery via the 13 pin towing electrics socket using a CTEK adapter supplied by FUTURANET (shop@fnltd.co.uk). It arrived today and has already been put to use. Excellent and so much easier. £22.99.