I am new to the forum (and e-bikes). I am from the US but I live in China near the city of Taiyuan. Last year I bought a new Wanbaolu (Marlboro in Chinese) "Exquisite Article" (or so it says) scooter. It was one of the largest most powerful ones I could find. The ones sold in the states are MUCH more powerful it seems. Mine has a 500W motor (I'm pretty sure) and I was told that's the biggest they have here. It is a 48V. No idea what kind of batteries it uses but I think it's a step up from the standard ones in China. It is governed at 25mph but feels strong enough to go faster. It climbs hills like a billy goat. I've ridden it into the mountains and climbed about 1,600 feet above my starting point with no problem except that after about 6-8 miles I have to turn around and ride back down because of a low battery. I bought the most powerful 48V I could find and only paid $433 for the bike new so I guess I can't complain much, but I'd sure like to be able to ride around in the mountains, especially on the dirt roads, and have more range, power and speed, but mostly range. The frame it is built on looks like the same stuff exported to the US (looks like a gas scooter with no muffler).
Here are my ideas:
Swap the controller and wheel/motor assembly for something more powerful. It has cable operated drum brakes now.
Keep it 48V but add another battery pack in series for extra range on long trips.
Are these ideas workable? Any ideas on what to do or where to get the parts? I don't think parts to do this are available locally.