Share your experience!
with original charger ned 3 hours , and with 5v 2a charger i charge for 2 hours,
but a dont know does have any batery dameged,, luks fine to me. no problems yet.
i yust the charger from samsung nexus 10 wich is 5v 2a and charge the xperia sp for 2hour, very speed charge,
yeah. i use the charger for the nexus 7 (5V 2A) and had no problem since.
I'm currently use qualcomm quick charge 2.0 certified charger that's give 5V/2A output. when used with xperia sp, it only charged the phone with 1.5A for the max capacity. It mean that no problem to use >850mA charger, because the phone will limit the power input. But, still recommend to use high quality/certified charger to ensure the safe power for the phone.
To check the input state, you can install "Ampere" app from google play store, this app show you the input and output state while charging / not charging.