My Razr Maxx was slightly better than the Turbo, I'd estimate +/- 10% over a full day of heavy use. I attribute that to the Turbo's faster, more demanding hardware & software especially, the QHD screen. That said, I still end a day @ 50-60% as opposed to 60-70% on the Maxx. Since everything (I do mean EVERYTHING) is smoother, faster & more useful on the Turbo I have been thrilled with the battery but it's clear the larger 3900 mAh battery was a good decision.No consistency, at all, up-down. Been using turbo charger overnight. Going to switch to regular charger. I really think my old RAZR maxx battery was as good if not better.