The LG G2 had the best battery life of any mid-sized flagship last year, but with the upgrade to a Quad HD display, LG hasnt been able to back this up. Despite the new display, LG hasnt included a larger battery in the G3, opting for the same 11.4 Wh (3,000 mAh) battery and hoping the efficiency improvements in the Snapdragon 801 will provide similar performance.
Dynamic clocking is present in the displays firmware, reducing the refresh rate of the panel when static content is being displayed, in an attempt to reduce power consumption. Theres also some clever manipulation of display brightness to ensure its as low as possible while still being readable, plus a typical power saving mode that gets activated when the battery level falls below 30%.
Generally speaking, during my time using the LG G3 as a daily driver, the battery life wasnt bad at all, but at the same time it wasnt outstanding. Depending on my screen on time and usage I tended to end the day with around 25-30% of the batterys juice remaining, which is a fair result but not in the same bracket as the G2 was. Our typical battery benchmark will give a better look at the G3s battery life, starting with the video playback test.
In this test you can easily see the battery life reduction from the G2 to the G3: the G3 performed 23% worse, even though the Snapdragon 801 is more efficient at video playback than the Snapdragon 800.
Its a similar story for Wi-Fi and LTE browsing. The G3 performs around the same level as last years Sony Xperia Z1, which didnt have awful battery life, but was soundly beaten by its competition. To last around 2 hours less than the Galaxy S5 is obviously a concern, although at least it wasnt as poor as the HTC One.
GFXBench shows how taxing it is to render at 1440p on a large display, lasing an estimated two and a half hours in intensive 3D gaming.
Thanks to Qualcomm Quick Charge 2.0, the LG G3 charged very quickly, as expected.