Which battery should you choose if you are going to build your own electric motorcycle?

The battery is an important part in such a conversion, you have different types of batteries:

  • LiFePo4
  • Lithium Ion
  • Lead Gel
  • Lead-Acid
  • Lithium Polymer

With each its own pros and cons, in this article I will not highlight all the pros and cons of each battery, but I will discuss which battery we have chosen and why.
(Watch the article on our forum for the pros and cons of each battery)

Our motor has an operating voltage of 60V 2000W so we also need a battery that can supply us with 60V 40A (I=P/U)(2000w/60v=40a).
We have chosen the 60v 15Ah with a max discharge rate of 40amps

Link: https://www.amazon.nl/lithium-ion-accupack-Scooter-Pedelec-Battery/dp/B0843RK8YY/ref=sr_1_3?__mk_nl_NL=%C3%85M%C3%85%C5%BD%C3%95%C3%91&dchild=1&keywords=60v+15ah&qid=1607078004&sr=8-3

This battery has the Li-Ion technology, Li-Ion batteries have the advantage that they are relatively light and compact, have a low self-discharge and require virtually no maintenance.


BMS:
The BMS in this lithium battery balances the cells and protects against overcharging, deep discharging, too high temperature, short circuit and too high currents. This BMS works fully automatic, when a limit value is exceeded the battery blocks, it restores itself when it is separated from the consumer. Because we use BMSs that can charge and discharge over the same MOSFETs there is no need for a separate charging plug, this increases the possible charging current and also makes it possible to use these batteries for regenerative systems. Due to the efficient design of the PCB, the BMS uses very little energy and it takes several years before the battery is fully discharged. Therefore, putting it away for a longer period of time is no problem.

Cells:
This type of battery uses NMC 18650 cells. Characteristic for these cells is the excellent energy density in combination with a favorable cost of ownership. All NMC 18650 cells we use are equipped with a CID (current interrupt device), where each cell is individually protected. As soon as a cell becomes too hot, it is switched off.


The battery we chose has the following specifications:

Lithium-ion battery pack 60 V15 Ah 900 Wh

  • Voltage: 60V
  • Capacity: 15 Ah.
  • Energy: 900 Wh
  • CE certified
  • LiCoxNiyMnzO2 battery
  • 18650 lithium ion cells
  • Weight: 4.8 kg.
  • BMS Battery Management System
  • Approx. 800-1000 charging cycles possible.
  • Temperature and overload protection
  • Dimensions: 319 x 119 x 69 mm.
  • Max. Continuous discharge current: 40 A.
  • Max. Peak discharge current: 120 A (1-3 sec.)
  • Shutdown voltage: 44 V.
  • Charging voltage: 67.2 V.

This article is writen by Mike Brink

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