Dewalt offers this lawn mower that has a collection box that can hold up to 55 litres. The maximum cutting height of 86 mm is great if you prefer a higher lawn.
From OnBuy
DEWALT DCMW564P2-GB DCMW564P2 XR Brushless Lawn Mower 18V 2 x 5.0Ah Li-ion
ITS
Dewalt DCMW564P2 18V XR Brushless 48cm Cordless Lawnmower, 2 x 5.0Ah Batteries & Charger