Strava

Afternoon all. This may have been dealt with on here before and I admit I can't be arsed to read the last 20 pages. iPhone 4s, full battery, strava for 4 hrs battery out. Any tips on making that battery run a little longer? Is there some sort of 'background' setting I can employ or are iPhones just bollocks for this sort of ride?

http://direct.asda.com/Duracell-USB-3-Hour-Battery-Charger/001134475,default,pd.html?utm_source=ggle-shop&utm_medium=css&utm_term=001134475&utm_content=Miscellaneous%20Batteries&utm_campaign=ad&cm_mmc=ad-css-_-ggle-shop-_-Miscellaneous%20Batteries-_-001134475&istCompanyId=71f4ae42-94c5-4821-aa58-05eff6da2486&istItemId=ltxitiqr&istBid=t

plug one of these into your phone...