Price: £54.99

Guarantee: Four year

Contact: Halfords 08457 626625, www.halfords.com

The advanced range of batteries from Halfords uses calcium technology, which bumps up the price, warranty, and, in theory, the overall performance. However, while we certainly cannot complain about this unit’s five starts from cold, or the 225- minute bulb test time, the product’s non-calcium stablemate outperforms it. And it is quite a bit cheaper, too.