Something was wrong with that bike. Even with a euro/UK spec of 250w of sustained power, you’re likely more than doubling your power with only about a 25% increase in total weight (assuming the bike is big and clunk and heavy, say 40lb more than your regular bike)
It may be that the power levels weren’t functioning correctly, a battery or motor problem, or perhaps the wrong gearing for the hills which made your efforts very hard to optimize.
But I can say from experience that 250w makes a huge huge difference going up hills, and if the bike is set up to allow it, will basically allow you to ghost pedal and go 15mph on level ground or slight inclines.
__________________
