Motion 300 battery

Just got the motion 300 and used it today after a full battery charge. I had about 3.5-4 hrs of use today and already had the low battery icon in the app pop up. Volume levels were around 1/2-3/4 volume and no bass boost except for maybe 2 songs.

I feel like that is to short of time before the low battery is already coming up in the app. How are these battery tests done at what level volume are they run to get the numbers they get?