Yes, Gionee A1 Plus does have quick charging. It takes less than 2 hours to fully charge its huge 4550 mAh battery.
Yes, Gionee A1 Plus does have a gyroscope sensor.
Yes, Gionee A1 Plus has stereo speaker. One speaker is located on the bottom of the phone and ear-piece also works as speaker and thus you will get excellent stereo sound output.
No. Gionee A1 Plus is not a water-resistant phone.