Question: how long does it take to charge a battery

Cathal Ó Murchú answered on 7 Mar 2017:

Well it depends on how big the battery is, which is measured in milliamp hours, or in short mAh. So more mAh means a bigger battery. My phone has a 3,400 mAh battery and takes roughly 1 hour to charge. Now that is a brand new phone with a special fast charger.