Q: What do the terms amps, watts and volts mean for my e-bike?

A: Your e-bike has an electric system that is measured by volts and amps. The voltage is the amount of potential electricity your battery holds.

The amps or current refers to the speed or rate of flow of electricity as it is being drawn from the battery. The higher the current the quicker the battery will be depleted. High current happens when riding with a heavy load, riding uphill, riding on bumpy and grass terrain etc.

The watts is a measure of the output of power that your e-bike can provide. Watts are measured by multiplying the voltage by the current.

Example: A 350 watt system can put out up to about 600 watts at peak but will provide 350 watts of power when riding under normal conditions. The rated power of your E-bike will affect the speed and or torque depending on the configuration.

Q: What are the advantages of Lithium Ion batteries compared to other rechargeable batteries ?

A: Lithium-ion batteries have several advantages:

They have a higher energy density than most other types of rechargeable batteries.  This means that for their size or weight they can store more energy than other rechargeable batteries. They also operate at higher voltages than other rechargeable batteries, typically about 3.7 volts for lithium-ion vs. 1.2 volts for NiMH or NiCd. This means a single cell can often be used rather than multiple NiMH or NiCd cells.

Lithium-ion batteries also have a lower self discharge rate than other types of rechargeable batteries.  This means that once they are charged they will retain their charge for a longer time than other types of rechargeable batteries.  NiMH and NiCd batteries can lose anywhere from 1-5% of their charge per day, (depending on the storage temperature) even if they are not installed in a device. Lithium-ion batteries will retain most of their charge even after months of storage.

So in summary; lithium-ion batteries can be smaller or lighter, have a higher voltage and hold a charge much longer than other types of batteries.

Q: How to store lithium ion batteries?

A: The batteries should be stored at room temperature, charged to about 40% to 50% of capacity. Occasionally, a lithium-ion battery with a very low charge is stored for a long period of time (6 months) and its voltage slowly drops to below the level at which its built in safety mechanism allows it to be charged again.  If the battery is going to be stored for several months it's a good idea to take it out and recharge it after 3 months.  Better yet would be to actually use the battery every 3 months and then leave it partially or fully charged.

Q: Should the battery be taken from the device in case of a long period of non-use?

A: Yes. A small current can also flow in the switched-off device, which leads to a complete discharge which, after a longer period of time, can damage the battery and at the very worst destroy it.

Q: What is understood by self-discharge and complete discharge?

A: In the case of lithium-ion batteries, 3% to 5% loss of charge monthly is possible the self-discharge is temperature-dependent and higher with increased temperatures.

By complete discharge is understood the "squeezing-out" of a battery until it does not yield this any more current at all. The voltage drops to 0 volt in this case. If this status is retained, chemically reactions progress at the electrodes in the battery, which make it partially to completely unusable. The result is that the battery loses capacity massively and possibly cannot be charged up any longer. For this reason batteries should not be discharged to below a type-dependent final cut-off voltage and should be charged up again as quickly as possible. Therefore lithium-ion batteries and lithium-ion-polymer batteries should basically not be discharged completely

Q: What is the cycle life of my battery?

A: The Lithium-NCM battery have a life cycle of 800 cycles. Over time your battery capacity will diminish. This means that you can charge and discharge the battery completely 800 times at a discharge rate of 0.5C before the capacity depletes to 80% efficiency.