If you are in a hurry and need your Samsung Galaxy S4 battery charging really fast, you can place your phone into flight mode for a short period. This will allow the battery to charge up more quicker because it will not be draining any power when connecting to the phone tower.
1) Plug a charger into your phone.
2) Switch it on from the mains socket.
3) Press the 'Power' button and select 'Flight Mode'.
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