The specs on the main page say "48 hours of normal use; advanced functionality like GPS use will impact battery performance." There's also a in the support sect

The specs on the main page say "48 hours of normal use; advanced functionality like GPS use will impact battery performance." There's also a in the support section talking about extending battery life: http://www.microsoft.com/microsoft-band/en-us/support/hardware/battery-life-tips http://www.microsoft.com/microsoft-band/en-us/support/hardwa...