It happens that David formulated :
However:
"230V. DC. Max. battery size 6Ah. Weight: 1.4kg" ????

Shirley the smallest motor car battery is around 40 Ah?


Something does not compute; I assume that the details are wrong.

I think they have their amps and amp/hours mixed up. The maximum output
is 6amps. I would be a little wary of the 'automatic' part of the
description, it reads as if it a basic transformer, rectifier with
ammeter unit with no automatic control so if left will over-charge a
battery.