going up a hill, its peddle all the way but the motor is an assist. In the flats its all electric unless you wish to peddle. on the flats,Top speed around 20mph, and even that feels fast for a bike on a flat. Down hill theres a bit of charging (like an old Ford Escape hybrid car). We bought three a few years ago and use em at the beach. I charge up the batteries in winter and keep em on a rack where I can check every few weeks .
I still hve a concern with Li battery tech because of the risk of fire whenever li is in an oxide stte. Thats why the new Li cells are going to other Li compounds