You sure dont know hoy battery replacement goes and you didnt watch the video to the end, whenever you are using the original battery board on a battery replacement procedure, and you reset the charge cycles to 0 and the effiency to 100%, if you conect the reseted battery to the iphone directly it will still show the previous efficency percentage, you have to connect a new battery or you have to connect the iphone directly to the lab power supply so the battery counter "resets" so to speak, then you connect the reseted battery and now it shows the reseted information, you dont have this problem if you change the whole battery with a new one but in some cases its more expensive and some low quality replacement batteries show the "unofficial apple product" warning message