Much like the S8 battery thread a few below, I'm looking for a reliable source. Replaced the original battery last November and my daughter didn't complain about it. In fact she said it sorted her problems. However, I'm now using said phone and I'd have to nurse it to get through the day. My memory of iPhone Plus models is that they shouldn't need that. Other than the usual gamble on ebay or amazon, any suggestions? Or could anybody point me to reasonable sellers on those places?