The NiMH battery lasts all day and is considerably cheaper than the Lithium battery
In the shadow of the (Shinto) Crow Woods shrine
Panasonic makes it and it cost about $600. Many battery bikes cost much more, but this one is very satisfactory except for one thing: Aluminum spokes are not good for supporting weight. My bike has been shipped to Osaka to replace the spokes for the second time in less than two years. I wish they would replace with stainless steel, but they probably won't.