Our lab tests show there’s no correlation between a high price and good battery life – in fact Which? test results show phones under £350 are more likely to have longer battery lives than those over £350. The handset squeezed out an impressive 51.5 hours of life when we put it through our battery tests. to unlock the mobile phones recommended by experts. Check our pick of the sales in our guide to the best mobile phone and Sim-only deals.