I echo other comments about the great customer service. My girlfriend and I had never used electric bikes before, and our IZIP experience was a fun and worthwhile introduction to them.
The rental bikes have a battery that's supposed to be good for 20 miles of essentially pure-battery operation (i.e. you aren't peddling) and somewhat more if used on the pedal assist mode. We rode around for 4-5 hours using mostly pure battery mode and the charge level had barely dipped below 2/3s.
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