Researchers at Strategy Analytics say mobile phone battery life isn’t keeping up with the increasing demands of today’s handsets. They’ve calculated that the average time between battery charges for a smartphone user was 3.2 days last year – but that’ll shrink to just 2.48 days by 2015. Web browsing, navigation and social networking are mainly to blame: they consumed 9% of battery life in 2008 but will eat 30% by 2014. Strategy Analytics says improvements in battery technology aren’t happening quickly enough, which means the ‘Energy Gap’ is growing by about 4% per year. [Report]