Here I will tell some advantages of Li-ion Battery
1. High energy density - potential for yet higher capacities.
2. Does not need prolonged priming when new. One regular charge is all that's needed.
3. Relatively low self-discharge - self-discharge is less than half that of nickel-based batteries.
4. Low Maintenance - no periodic discharge is needed; there is no memory.
5. Specialty cells can provide very high current to applications such as power tools.