I would consider shifting to a 6+ before lugging around a heavy battery ...... I find the 6+ far superior to the 6 for battery life - I utilized the 6 for 3 weeks before upgrading to the 6+ so have some experience with both devices ...... also, lots of tricks to extending battery life you may want to review before lugging a large battery ...... I do carry a small battery I use in a pinch but the combo gets me through most days .......