Garmin Edge 130 Power problems

Brand new Garmin Edge 130

Works ok synced to computer and plugged in.

Whenever unplugged the screen fades and it cannot be reactivated until plugged back into a power supply.

If turned off even on power supply - you cannot turn it back on via the power button only by unplugging and plugging in again.

Software is up to date.

Power button works in that a single push alters screen brightness ok.

Is it a battery or software issue?