Battery duration very short

I recently purchased an MVA 1000 robotic lawn mower and I have a question regarding its battery performance. On flat terrain with short grass, the mower does not seem to cover more than 70 m² on a single charge.

Could you please confirm if this performance is normal, or if it might indicate an issue with the battery or the unit?

Thank you in advance for your assistance.

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I've noticed that it varies - 70m2 could okay too.
My MOVA has mowed between 60m2 and 81m2.
Mowing efficiency: Standard 800m2/day & Efficient 1200m2/day.
Charging time is about 40minutes.

Buy a bigger battery;)