# Daily Driver E-Bike

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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.

Thanks

IK

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## 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

2.5Ah*5p=12.5Ah

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 7: To Be Continued...

Participated in the
Wheels Contest 2017

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## 4 Discussions

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