Hello, I'm new to all this, but I just bought a second hand Phantom and it came with 3 batteries: 2x Phantom 3s 2200mAh 20c 1x CarbonBird 3s 2250mAh 45c I'm using the standard Phantom charger on 3A. I've been charging these batteries, but they seem to be taking way too long. For example, I had one of the standard Phantom batteries on charge for well over 4 hours and the light has not turned steady green. Instead, the light alternates between red and green. From what I understand, this is meant to mean its charging in CV mode, which also means its over 80% charged. From what I read, it should take about 1.5 hours to fully charge. Is that normal?