Which Battery Charger/Booster for my car

[milleniumaire]

Hi, I'm looking to purchase a battery charger that will also boost start my car, which is a 2007 Jaguar XKR. The battery in the car was installed in November 2013 and is a Varta Silver Dynamic 019 Battery (H3).

http://www.varta-automotive.com/en-gb/products/aut...

I'm considering purchasing the following charger/booster, but I'm not sure if the booster facility will be powerful enough for my engine size. I've read that some chargers only work for specific engine sizes.

http://www.amazon.co.uk/Ring-Automotive-RCBT30-Cha...

Can anyone advise on what I should be looking for in a charger/booster that will work with my car?

Thanks.

[normalbloke]

Ensure you have a good battery, and a decent maintenance charger(CTEK) and you'll never need the booster function.