Is every ZenFone 5's charging speed slow or just mine? My battery charged about 10% every half hour, about 4 hour to fully charged. Zenfone 5 user, please tell me?
Try to re-calibrate battery
To re-calibrate battery, charge your phone to 100% without interruption, then discharge it normally till 0%(phone gets switched off).
Charge it to 100% in switched off condition and keep it in that state for a little more time now switch on your phone in charged condition and unplug when ASUS logo appears keep the phone unused for 5 mins, you will get far better battery life as the battery stats.bin file will be updated.