I use an app called Accubattery and it gives me a battery health reading after I charge my phone. I noticed ever since I started using the Anker Powerline USB cable, due to losing my Samsung cable, the battery health reading has drastically decreased. It says the battery capacity is now 3,399 mAh instead of 3,500. Should I trust this reading and is there a way to accurately measure the current capacity of the battery? Thank you.