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What are the advantages of li ion battery


What are the advantages of li ion battery
Compared to the other rechargeable batteries technologies ( nicked cadimium or nickel metal hydride), Li ion batteries have a number of advantages.
Firstly, they have the highest energy densities of any other battery technologies today.
Secondly, li ion battery cell can deliver up to 3.7 volt, which is 3 times than Ni-Cd or Ni-MH, and thanks to the serials and parallel connections, they can deliver large amounts of currents for high power applications.
Thirdly, they are also comparatively low maintenance, and do not require schedule cycling to maintain their life, even after  500 times full charge and discharge, the capacity is still 80% of the initial. 
Fourthly, they have no memory effect. As we know, a detrimental process where repeated partial discharge/charge cycles can cause a battery to "remenber" a lower capacity. Li ion have a clear advantage over both Ni-Cd and Ni-MH.
At last, they also have low self discharge rate of around 2% per month, and they do not contain loxic cadimium, so that they can earier to dispose of than other batteries.
Due to these advantages, Li ion batteries have become more and more popular and have replaced Ni-Cd and Ni-MH as the market leader in electronic devices and systems.