I bought this at a garage sale, I'm having a hard time finding anything about it on the web. It's got a Currie electro-drive 24 volt/12 amp system and I believe a 250 watt motor. I think it's older (early 2000's). I have a hard time judging speed on a bicycle but I don't think it gets anywhere near 15 mph and at a normal speed biking, the motor isn't spinning fast enough to assist me in pedaling.
When I try and charge the battery it never reaches full and turns green. I'm going to buy another battery, but I'm wondering if anyone is familiar with the system and if it's possible to buy two and wire them in serial without burning everything up or if I should be looking for another motor (and controller?) that's more useful.