If you can get access to a working VIDA/DiCE install, it has an inbuilt alternator test that will tell you whether its the battery or the alternator.
Often, if a battery is allowed to get seriously low, it will be permanently damaged and no longer accept a full charge.
A new heavy duty battery for the XC (from Varta) is about £90 from eBay / motor factors, so thats where I would start.
New battery first - and then if still knackered start down the track of a new alternator.....?
If you are close to friendly forum member try to steal/beg/borrow a working VIDA install.
In the long run, buying a VIDA/DiCE from eBay can end up saving you big £££ and will provide all the answers you need in situations like this.
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2007 V70 P3 2.0
Ex: 01 V70 T5, 04 S60 D5, 05 V70 D5, 09 XC90 D5
Other cars: MINI Clubman Cooper S, GMC Yukon XL Denali 6.2L, Ford Mustang GT 5.0 Supercharged 735bhp.
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