High Performance
High energy density: more energy less weight.
High charge currents (Shortens the charge period  essential for a proper solar power system).
High discharge currents (Enabling for example electrical cooking on a small battery bank).
Long battery life (up to six times the battery life of a lead acid battery).
High efficiency between charging and discharging (Very little energy loss due to heat development).
Higher continuous power available.
 
Rugged
A lead acid battery can fail prematurely due to sulphating if it is left partially charged, fully discharged or rarely fully charged for long periods of time. A Lithium Iron Phosphate battery does not need to be kept fully charged, has a wide operating temperature range and excellent cycling performance. They are therefore THE battery for very demanding applications.
 
Efficient
The typical round trip energy efficiency (energy that can be taken out of the battery compared to energy required to re-charge) for lead acid batteries is ~ 70%. For a LiFePO4 battery it is >96%. The Final C20% charge for a lead acid battery is particularly inefficient with inefficiencies of ~ 50% and can take a very long time for the battery to become completely charged. In contrast a LiFePO4 battery will always achieve 96% efficiency and so can be fully charged more quickly while wasting less energy.
 
Size & Weight
LiFePO4 batteries save up to 70% in space and 70% in weight compared to lead acid.
 
Battery Management System
It is vital that an advance Battery Management System (BMS) is used to control the battery charging. This is important to actively balance the individual cells that make up the battery and prevent under or over voltage which can otherwise destroy the battery. It is also important for the battery to be able to communicate with the rest of the system.