I am going to post the information because lots of ppl is interested and also the source is from Meizu whose test would be professional and trustful.
Someone of better English may provide better translation, I just share the information and if you have any query, feel free to ask, I will try the best to make it clear.
Original Information(On the bottom view)
电池与续航测试条件(Battery life and test conditions)
1. 通话时间:将电池完全充满电,使用默认设置,在网络信号较好的地方,用两部M8使用两张联通的卡互相通话进 行测试。让手机一直保持在关屏状态下通话,记录直到电池电量耗尽自动关机的时间。
1. Calling Duration: Full charge the battery, use default settings, hold the conversation between two M8 devices by using China Unicom(the 2nd largest mobile network in China) SIM Card under environment with good signal. Record the time until power drained and auto off.
2. 待机时间:将电池完全充满电,使用默认设置,分别插和不插SIM卡进行实测。测试过程中保持待机状态,不频 繁点亮屏幕,每天检查一次使用的电量。记录直到电池电量耗尽自动关机的时间。
2. Standby Time: Full charge, use default settings, test the duration with/without putting SIM Card. Maintain standby state during the test, do not lighten the screen frequently, check the consumed power once per day. Record the time until power drained and auto off.
3. 视频播放时间:将电池完全充满电,使用默认设置,不带SIM卡,播放MP4格式视频,分辨率为480*32 0, AAC 44.1khz,128kbps的音频格式,亮度为60%,高低音关闭,音量调节为50%,插上耳机,连续 播放,记录直到电池完全耗尽自动关机的时间。
3. Video Play Time: Full charge, use defalt settings, do not put SIM card, play MP4 video at 480*320 resolution, AAC 441.khz, 12kbps audio spec, brightness 60%, disable treble and bass(M8 could set sound effects for video play), volume 50%, earphone connected, playback until power drained and auto off.
4. 音乐播放时间:使用默认设置,不带SIM卡,播放MP3格式比特率为128kbps的音频格式,EQ关闭, 高低音关闭,音量调节为50%,插上耳机,关屏单曲播放。记录直到电池完全耗尽自动关机的时间 。
4. Music play time: Using default settings, put no SIM card, play MP3 audio format at 128kbps spec, EQ disabled, treble and bass disabled, volume at 50%, earphone connected, screen turned off and playback for sigle unit song, record the time until power drained and auto off.
5. 默认设置为:飞行模式、GPRS都关闭,电话打开,自动亮度调节打开。
5. Default setting: Flight Mode, GPRS disabled, phone switched on, brightness auto adjustment enabled.(I am not quite sure "电话打开“ means phone is on or just indicate phone fuction is enabled)
型号BA1200, 1200mAh, 3.7V,锂聚合物电池
Battery Model: BA1200, 1200mAh, 3.7V,Li-polymer Battery)
通话时间:370min Call Duration Time: 370 min
待机时间:带SIM卡179小时,不带SIM卡374小时 Standby Time: 179hrs with SIM, 374 hrs without SIM.
视频播放时间:7小时 Video play time: 7hrs
音乐播放时间:21.5小时 Music play time: 21.5 hrs