I've had friends take their phones in for a battery replacement, and let's say the results were not better than before they took their phones in. As with buyin

I've had friends take their phones in for a battery replacement, and let's say the results were not better than before they took their phones in. As with buying a battery from ebay, it's still not gonna be an OEM battery (or am I wrong?). OEM stuff is more important for phones than for laptops, I have found