CEF50 full carbon, Bafang M820 budget build thread

[lkdoido]

Hola con la batería de 48v 700 wh lee el display el porcentaje de batería bien

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No soy un experto, pero empecemos con algunas preguntas básicas:
1- ¿nunca ha funcionado o es un fallo reciente;
2- Todo el sistema está a 48v (batería, motor y display);
3- ¿Qué versiones de software de motor y pantalla?

 

[temon10]

So I decided to go with a smaller capacity battery to drop some weight as I have, for the most part, been doing short rides on trails near my house and figure a more playful bike is more important than range to me. I replaced the factory 720Wh 36v with a homemade 360Wh 36v battery. I designed a custom 3D printed case for it and the whole thing reduced the weight of the bike by 5lbs! It now weighs just under 40lbs so I guess it could be considered a super light emtb now?

This is my battery next to the factory 720Wh one View attachment 133624

I video'd the build process if anyone is curious how to build a custom battery (and also see the inside of a CEF50 frame and how the battery mounts).


If anyone wants the 3D print files, let me know. I plan to upload them to Thingiverse. Also here's a parts list for the components and tools I used:

20 x Samsung 50E 21700 5000mAh 9.8A Battery cells. I got them from 18650 Battery Store - Trusted Supplier of Lithium Ion Batteries
- Spot welder 3.54￡ 79% OFF|99 Gears 8V 24V Spot Welder Kit Digital Power Adjustable Spot Welding Pen Control Board Nickel Sheet For 18650 Lithium Battery| | - AliExpress
- 10S Battery BMS 0.4￡ 90% OFF|Bisida Bms 24v/36v/48v/7s/10s/13s Different Ports Rechargeable 18650 Lithium Battery Protection Board For E-bike/e-scooter - Integrated Circuits - AliExpress
- Heat shrink wrap 1.7￡ 49% OFF|PVC Heat Shrink Wrap Tube Insulation of Width Length 1M Battery Packs30/50/70/200±2MM for Big Battery Pack Power&DIY Projects| | - AliExpress
- Grid nickel strips 2.3￡ 49% OFF|2p 3p 4p 21700 Spcc Nickel Plating Strip Battery Nickel Tape For Battery Spot Welding Machine Welder Equipment Diy Battery Pack - Spot Welders - AliExpress
- Straight nickel strips 2.39￡ 39% OFF|Welding low internal resistance pure nickel strip lithium battery pack Pure nickel sheet power lithium battery connection| | - AliExpress

if I modified your 3D print case to fit 40pcs cells, can the length of the case still fit in the frame?

 

[Ndanger]

Very well done, great write up and lovely bike!