my electric bike uses a hub motor from electricrider.com and 4 36v dewalt lithium batteries (2.3ah each) got them for around $100 each on Ebay brand new, they will power my bike at 25-27mph without pedaling, and give me a 15-20 mile range depending on hills with me, a 235lb rider, more if I pedal, but the one time I did run them dead was about 15 miles ridding with a friend on his electric bike and a no name 10amp hour 36V lithium battery off Ebay, his performed about the same as mine, but was a cheaper set up with a smaller hub motor, mine took off from a dead stop faster, and climbed hills better.
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