I am now powering my e-bike with 2 of these batteries. Mind you these batteries are not new and are the smaller 2.5Ah. I spent $6 US for my batteries, but with shipping and brokerage fees(forgot about that one when I ordered!) I figure I spent $17 CAD. So for $34 CAD and a couple more bucks for wire and connectors I have a decent battery pack for $40 CAD! I think If I used 2 new 5Ah batteries it would be very comparable to the battery I purchased for my bike but for hundreds less! I use XT60 connectors soldered to the main terminals and made a y connector with 2 XT60 connectors going to a XT90 connector to match my e-bike. I do plan on making a mount system so I can slide the batteries in and then connect the connectors.
The motor on my bike is a Pro 902 250w 36v(works on 40v). I bought the motor thinking I just wanted assistance with getting up to speed from a stop and it works great for that. if you want a cruising motor(one where you don’t have to pedal at all) this one will work but I would recommend at least a 500w motor to give you more performance. i was happy with the motor until I purchased a 500w motor for my wife, and now she is way ahead of me without any effort.
Link to Battery Hookup: https://www.batteryhookup.com/?rfsn=4057226.686605
amazon.com link to mid drive you can power with these batteries: https://amzn.to/2ZyNk8Q
amazon.com link to inexpensive motor(make sure you grab 36v version!): https://amzn.to/2Fu5eTg
amazon link to similar motor to mine(possibly better) 500w: https://amzn.to/35E7j9U
amazon.com link to ryobi dock so you dont have to solder to the battery: https://amzn.to/3jAnJ72
amazon.com link to xt60 adaptors: https://amzn.to/2DhOe1C
amazon.com link to xt60 with wires attached already: https://amzn.to/34TgC5N
amazon.com link to power supply I use: https://amzn.to/3hXIysX
amazon.com link for similar power supply: https://amzn.to/3ir1BMv
link to my other e-bike video: https://youtu.be/VOfKGH66Wa4
the above links help me get paid(hopefully) and will encourage me to make more videos.