Batteries suggestion for my moped conversion

My first post.

I need advice on whether to get 48 volt or 36 volt lithium? How many amp hours?

I’m converting this to a hub motor and lithium: my old “ego” electric scooter, which had a belt drive, with two, 12 volt, 34 ah lead batteries. So my new set up is going to be hub motor with lithium. I weigh 150 Ibs.

I’ve now got a beefy hub motor on it, and EM3ev Infenion controller. (12 fet, 40 amp, 36 to 72 volts).

Wheels are 20”. I loved the speed and range of my old lead set up. Seemed like I could go 10 miles at 18 mph. As close to that as possible is what I want. I don’t want much slower than 18 mph, and not faster than 20 mph. Seems like my calculations show that 36 volts in theory just about reaches 18 mph. Can I count on that, or should I go to 48 volts to be safe? And how many ah? Thanks!

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With the smallish wheel like that go for 48V and as many amp hours as you can fit and afford. Nothing beats having a big battery. It enables conservative charge and discharge levels, which greatly increases battery life. I take that back, having enough speed to mix safely with traffic beats range.

Post a picture of the Ego if you get a chance. I haven't seen one of those for years. I would go for 48v myself. You can always limit the speed electronically if you want.