Acer B1-721 - Manual (Page 48)

48 - Specifications
Power
• DC power-in (5.35 V, 2 A or 5.2 V, 1.35 A)
Connectivity
• Bluetooth 4.0
• Wi-Fi IEEE 802.11b/g/n
• GSM 850 / 900 / 1800 / 1900 MHz
• WCDMA 850 / 900 / 1900 / 2100 MHz
• HSPA+ / GPRS / EDGE
• GPS
Camera
• Front camera
• 0.3-megapixel
• Fixed focus
Expansion
• microSD card slot (up to 32 GB)
Battery
• 11.2 Wh 2955 mAh 3.8 V 1-cell Li-polymer battery pack
Battery life: Up to 5 hours (based on video playback test results)
Note
Length of battery operation will depend on power consumption which is
based on system resource use. For example, constantly using the backlight
or using power-demanding applications will shorten battery life between
charges.