Daily Driver E-Bike




About: I am Undergrad Electrical Engineering student who is DIY enthusiast and like to share information.

My Goal is to convert a $99 bike to e-bike with a budget less than $700 and use my bike as my daily driver.

Since I am focusing on battery life cycle, I want it to last much longer as possible. I am using BMS(Battery Management system) and a charger that was able to charge the battery at 80%.

Any suggestions and comments are welcome.



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Step 1: Parts Needed

Step 2: Battery Design

The battery I am using is Samsung 25R 18650 2500mAh 20A Battery

Specs (I got from IMR.COM)

  • Nominal Capacity: 2500mAh
  • Nominal Voltage: 3.6V
  • Protected: NO, UNPROTECTED
  • Dimensions: 18.22mm x 64.80mm

Weight: 43.71g

My Motor

  • Voltage: 48V
  • Power: 1000W

I need at least a battery pack that supply 48V. I decided to go with 52V setup. 14S and 5P.

In Theory, I am getting

3.6v*14s= 50.4V


and single 18650 has 3.6V*2.5Ah=9Wh. Therefore my overall Watt Hour will be:

Watt hour =Amp hours of cell *nominal voltage of the cell

Wh = 50.4V*12.5Ah=630Wh

Step 3:

Step 4: The Overall Design

Step 5:

Step 6: Testing the BIke

Step 7: To Be Continued...

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    4 Discussions


    1 year ago

    i;m also thinking of doing the same project ,don't forget the dangers of li-ion batts . i think protection is needed ,and once made i thought of filling it with oil to keep them evenly cooled when charging and also in use ,and away of hiding the cables around the frame .just an idea what about super capacitors could be more money

    1 reply

    Reply 1 year ago

    Thanks for your feedback. I will take that into consideration. Also I will try to place high power cable on one side and low power on the other side.


    Reply 1 year ago

    Thanks! I will post a video and more information once I build 18650 Cells :)