The battery is 100% upgradeable, because it overheats and restarts the equipment very frequently. The quality of the photographs is variable; It would be expected more with the 20 mpx offered, but the quality disappointed me, in particular with the nocturnal photographs and with the stability of the image. As for storage, factory apps occupy much of the space but do not allow uninstallation. I never allowed myself to upgrade to Android Marshmallow even though Sony indicated its compatibility. A total fiasco.
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