Price: £276.49

Guarantee: Two years

Contact: Exide 0845 450 2400, www.exideuk.co.uk

Our first AGM battery boasts 900 amps of cranking power, despite not being much bigger than a standard 063 casing. Unsurprisingly, results in all of our tests were astounding. This managed 12 cranks after the freezer, and nearly 10 hours of keeping our test bulb glowing. But the phenomenal price rules it out for the average motorist.