Charging phone for first time
Hey, I just got the ZTE Grand X 5 inch from Cricket (I know it's a low level phone but I just use it for basic online and phone functions) and I'm charging it for the first time and noticing it is taking a really long time to charge. I previously had the ZTE Source from Cricket, which is basically the same phone just 4.5 inches instead of the 5 inches this phone has. Its been charging for 2 and a half hours at this point and I've only used it for about 30 minutes of that time and it is at 48% at this point. I even tried using my old Source's charger (which appears to be exactly the same) and it didn't improve the charge time. I even plugged the source in alongside the Grand to see the difference and while the Source has charged 15%, the Grand has went up 4%. The Grand X is even supposed to have the Quick Charge 1.0 and charge 40% faster while the Source didn't have that.
So my question is, does a phone generally take longer to charge the first time you charge it? I've never noticed that before but I suppose it's possible. Does this seem like a defective battery/phone and should I return it? Thanks in advance.