Lithium battery is latest technology product in battery storage market, It has many advantages including
1) faster charging - battery gets charged 100% in just 2-4 hours
2) It is maintenance free 
3)  longer life - Compared to Lead acid and SMF, Lithium battery has 2,000 cyclic life which translates in 10 years useable life.
4) light weight - the weight of a lithium battery is 1/4th of Other comparable batteries such as SMF, lead acid batteries.