Electric Bicycle Factoids

-There are two types of assist featured on electric bicycles- pedal assist, and power-on-demand. Bicycles from the Minneapolis Electric Bicycle Company are equipped with both.

-The popularity of electric bicycles in China was in part fueled by the SARS outbreak, when the population was reluctant to ride public transportation due to risk of exposure.

-The heart of an electric bicycle is the battery technology. Modern lithium-ion technology will ensure a longer life and better performance.

-An electric bicycle offers the same health benefits as traditional cycling, only it allows the rider to choose the level of exertion.

The LiFePo4 Battery Difference

Safety characteristics inherent to LiFePo4 technology result from the incorporation of phosphates as the cathode material. Phosphates are extremely stable in overcharge or short circuit conditions and have the ability to withstand high temperatures without decomposing. When abuse does occur, phosphates are not prone to thermal runaway and will not burn. As a result, LiFePo4 technology possesses safety characteristics that are fundamentally superior to those of Lithium-ion batteries made with other cathode materials.

LiFePo4 technology does not contain any heavy metals and does not exhibit the "memory effect" of Nickel-Cadmium and Nickel-metal Hydride solutions. LiFePo4 technology demonstrates excellent shelf life, long cycle life and is maintenance free.

10 Reasons Why We Use The LiFePo4 Battery
  1. High Performance
    High theoretical capacity of 170mah/g and high practical capacity as high as 165mah/g.
  2. Extremely Safe/Stable Chemistry
    High intrinsic safety, will not explode or catch fire as a result of collision, over-charging or short circuit. High thermal stability of phases up to 500C.
  3. High Rate Capability
    For all high power output application
  4. Extraordinary Long Cycle Life
    Up to 2000 cycle life- over 8 times the life of Lead Acid and 3 times of NIMH, 2 times most Lithium batteries.
  5. Long Service Life
    Around 5~6 years
  6. Environmentally Friendly
    Non-toxic, non-contaminating No rare metal , UL, CE, SGS/ROHS approved. Wide working temperature range -From -4 F to 150 F (-20 C-+70C) Extemely cold and extremely hot weather will not effect its performance
  7. Flexible Form Factor
    Small in size and light in weight 1/3 weight of Lead Acid and 65% weight of NIMH.
  8. No Memory Effect
    The memory effect is when batteries gradually lose their maximum energy capacity if they are repeatedly recharged after being only partially discharged.
  9. Fast Charge
    Can be fully charged in a very short time
  10. Calculated Draw
    Works through the motor/controller for optimum efficiency
Comparing Batteries

Lead Acid battery: Although lead acid is a widely used and relatively inexpensive technology, it has a poor cycle life and energy density, is unsuitably heavy, and extremely toxic.
Nickel Metal Hydride battery: This battery also has a relatively low energy density, decays faster under high temperature, suffers the memory effect, and is not suitable for high output usage.
Lithium Iron Phosphate Battery: Proven as the most environmentally friendly battery, it is the safest and most suitable for high output usage.

Comparing LiFePO4 battery with other Lithium Batteries

There are three types of lithium ion cells based on different cathode materials. They are lithium cobalt oxide, lithium manganese oxide and lithium iron phosphate types.

Lithium cobalt oxide cell has the advantage of high energy density, although it suffers from safety concerns due to unstable chemistry.
Lithium manganese oxide cell has been evaluated for the application on high rate due to the better safety characteristics. However, its high temperature performance is the major drawback.
Lithium iron phosphate cell has the best safety characteristics, long cycle life (up to 2000 cycles) and good availability. It is very suitable for high discharge rate occasions as needed for pedal assist or on-demand performance with a Minneapolis Electric Bicycle.