I have the older powakaddy and it is easy for spares but our golf shop have stopped selling the new ones as they say there is very little after sales service with Powakaddy unlike Motorcaddy which is very good.
I had a Go Kart for many a year and very was very happy but recently changed to a Motocaddy M1 (lithium) and it's even smaller than the GK and I'm very pleased with it