Well, I took it apart today and threw in some mostly dead 10Ah batteries I had pulled out of my uncle's electric mower. They didn't fit great, but it powered right up and gave me a few minutes of zipping around the driveway just fine. Looks like I just need to figure out what kind of a pack I want and find a charger for that pack. Not too bad at all.
Of course I do have a 300W motor (OE is 200W) kicking around that I do think has the same mounting... Probably shouldn't bother, I'm assuming it would toast the controller.
I do really like the idea of upgrading the batteries. Those 9Ah (not 7Ah as thought) can be charged faster than most of the chargers out there. Most of the ones I've seen are 1 or 1.5A... slooooow as Stubby79 said. A 3A charger would be a lot nicer and not damage the batteries, but it'll require some tinkering and that would be fun. Lithium of course would be far superior, but then we're looking at a BMS too. I haven't seen any that are nice and also not crazy expensive out there. If you know of any that would be great. I still have a bunch of 18650 cells that would make a great pack for this thing.
