ZenFone 2 built-in 3000mAh capacity battery, if with fast charge charger, charge 39 minutes up to 60% of capacity. Asus Zenfone Blog will give you some reference about ASUS Zenfone 2 Battery Performance (ZE551ML 1.8GHz/2GB RAM)
Phone Model: FullHD Z00AD/ZE551ML/2GB/32GB
Test 1
Play Video using MX PlayerVolume: 20
Brightness: 50%
Video: MPEG4 Video (H264) 1920x800 23.976fps [V: English [eng] (h264 high L4.1, yuv420p, 1920x800) [default]] Audio: DTS 48000Hz 6ch 1536kbps [A: English [eng] (dts, 48000 Hz, 5.1, 1536 kb / s) [default]]
Result:
13:52 - 16:10 100% ~ 75% About 2 hours 20 minutes 25% power 1 hour approximately 10.7%
Battery Monitor Screenshots:
Test 2
unused standby power saving actions to keep the InternetResult: 00:48 - 09:56 60% to 56% 9 hours power consumption of about 4%
Screenshots:
Test 3
standby no WIFI no network no power-saving mode
Conclusion: 8 hours Standby decline 0%
Screenshots: