Comparison Between Lithium-Iron Phosphate Battery and Lead-Acid Battery

Nowadays more and more customers choose lithium batteries for the PV solar system and UPS power system to provide longer backup time. Here we simply introduce the performance comparison between lithium iron phosphate battery and regular VRLA batteries.

1.Volume and Weight

Lead-acid batteries have a lower energy density, and batteries of the same capacity are 2 to 3 times larger than lithium batteries.

2.Installation

Lead-acid battery: The battery cable is connected at the site, and there are many wires, which are easy to be untightened.
Lithium battery: The copper bus bar between the internal cells of a single battery module box is laser welded, the contact is more reliable, the external connection line is less, it is easy to check, and it is not easy to have operational errors.

3.Intelligent Management

Lead-acid battery: It can be directly connected and used. If it fails during use, it will easily cause damage to the supporting equipment.
Lithium battery: With the battery management system (BMS), it can cut off the battery circuit immediately in case of failure, and it is safer and can be equipped with a touchscreen.

4.Service Life

Lead-acid battery: The cycle life is 300~500 times, after which it is basically unusable and needs to be replaced.
Lithium battery: The cycle life is ≥ 2000 times, after which the capacity is only reduced to about 80%, and it can still be used.

5.Charging Capacity

Lead-acid battery: The charging current needs to be set very small and it takes a long charging time. (The high current charge is almost 70% full, which basically can’t meet the demand.)
Lithium battery: Basically, it can maintain 1C charging (full charge in 1h), faster, and the power can reach more than 95%. Some batteries can be continuously charged in 2C (filled in 0.5h), and the full charge can reach 92% or more. It is very suitable for use in areas with extremely unstable power supply.

6.Environmental Adaptability

Compared with lead-acid batteries (-10 ° C ~ 40 ° C), lithium batteries (-5 ° C ~ 65 ° C) better adaptability to high-temperature environments.

7.Environmental Characteristics

Lead-acid batteries have great pollution to the environment, and lithium batteries do not contain heavy metals such as lead and cadmium, which are harmful to the human body and have no pollution to the environment.

8.Battery Pack Appearance

Lead-acid battery: Connect multiple single cells and place them inside the battery cabinet.
Lithium battery: It consists of multiple standard-size rack-mounted battery module boxes, which are connected by a small number of battery cables. The external cabinet uses a standard network cabinet, and the control unit has a fault indication function.

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