I stay in hills, to come down I have to travel 45km down and 45km up. Will battery bike be best?

As per your requirements, we would suggest you to opt for an electric scooter/bike with good range and performance. There are ample options available such as Ather 450X, Revolt RV400, Kabira Mobility KM 400, etc. However, the availability of these electric two-wheelers could be an issue as they are available in limited cities. You may click on the given link and check out the available options for an electric scooter/bike. Furthermore, we would suggest you to take a test ride for a better understanding of performance and comfort before making the final decision. Follow the link and select your desired city for dealership details.