Bests & Worsts Reviews from Amazon

When I first received the battery, I was getting a pretty poor charge out of it (as bad as if not worse than my aging Note 4 battery). Before leaving feedback I made sure to contact the seller, who was very prompt and courteous in their response. If there is any one thing I can fault (and perhaps I just missed where this is written down), there were no instructions on calibrating the new battery. From PowerBear, with edits by me: HOW TO PROPERLY CALIBRATE YOUR NEW BATTERY: 1) Turn off your phone. 2) Remove the original battery from the phone and replace it with the battery you want to calibrate. 3) Turn on your phone. 4) Charge your phone until the battery is at 100%. 5) Let your phone battery drain to 0% until it automatically shuts off. 6) Repeat steps 4 and 5 at least 2 more times. 7) Your phone should now be calibrated to its new battery. I've been through 2 complete charge cycles (draining the battery completely and then charging to 100%), and am now getting approximately 48 hours of battery life on a single charge, possibly a bit more. I charged my phone completely on Saturday afternoon (probably around 3 PM) and have not plugged it into a charger since then. With moderate usage (Skype, phone calls, occasional web browsing), I'm now at 50% on Monday morning (10:14 AM). I went from being disappointed to very impressed with PowerBear's quick response and attention to detail in their instructions, not to mention the battery life I'm getting. I don't normally purchase aftermarket batteries, but this (so far) is absolutely a better buy than attempting to find a legitimate Samsung battery. If my experience changes in the next 6 months I will be sure to update this review, however it seems that others have had solid lasting performance with these batteries. I would definitely recommend this to anyone looking for a Note 4 battery replacement. Notes: I do NOT use Fast Charging so I can't comment on this battery's ability to cope with it. I don't think Fast Charging is good for the life of the battery (used to heat my Samsung battery up quite a bit, which is not good for batteries). Anecdotally, I also noticed that the lifespan of my original battery greatly decreased in short order (1 to 2 months) after Fast Charging was enabled. I leave it off and will continue to do so. I *was NOT* compensated in any way for this review (discounts, free product, or otherwise). I purchased this product at full price with my own money.