Update to Motorola Moto 360 greatly improves the battery life of the smartwatch
To be sure, Ambient Mode must be disabled to achieve this type of battery life. This is the mode that when enabled, keeps the watch face lit up, albeit with dim lighting. Using the Ambient Mode makes the Moto 360 more akin to a regular watch by having the face always available to view. The cost for this is shorter battery life, since the screen is always on. Still, the update also improves the battery life for the Ambient Mode.
The Moto 360 is equipped with a 300mAh battery. Our review showed that with the Ambient Mode off, the watch could last a day without needing to be recharged. With the Ambient Mode on, the battery lasted for about half a day. But with Build# KGW42R and Android Wear softwear version 126.96.36.1998224 on the timepiece, you should be experiencing much longer battery life for your watch.
source: Reddit via AndroidAuthority