Frequently Asked Questions:

The lithium iron phosphate (LiFePO4) battery is a type of rechargeable battery, specifically a lithium ion battery, which uses LiFePO4 as a cathode material.

There are three types of Lithium Ion Cells based on different cathode materials. They are lithium cobalt oxide, lithium manganese oxide and lithium iron phosphate types. Although lithium cobalt oxide cell has the advantage of high energy density, it suffers from safety concerns. Lithium manganese oxide cell has been evaluated for the application on high rate due to the better safety characteristics. However, its high temperature performance is the major drawback. While Lithium iron phosphate cell has the best safety characteristics, long cycle life (+2000 cycles) and good availability. It has higher discharge current, but it has lower voltage and energy density than normal Li-ion cells. It is the safest and most suitable for high output usage. It is also the best for storage battery usage. It is not necessary to use the equalizer and the protecting PC Board module. Comparison Data among Various Lithium Base Batteries：

In summary, the characteristics of lithium iron phosphate (LiFePO4) are as follows:

A) The safest and the most environmentally friendly

The Lithium Iron Phosphate Battery has been proven as the most environmentally friendly battery. The primary concern with Li-Ion batteries is safety. Overcharging and overheating can cause fire and explosions. The exception to this is the LiFePO4 battery.

B) Fast “forced” charging

Because an overvoltage can be applied to the LiFePO4 battery it can be charged by only one step of CC (Constant Current) to reach 95% SOC (State of Charge) or be charged by CC+CV (Constant Current + Constant Voltage) to get 100% SOC. This is similar to the way lead acid batteries are safely force charged.

C) Large overcharge tolerance and safer performance

A LiFePO4 battery can be safely overcharged up to 30V without protection circuit board. It is therefore suitable for large capacity and high-power applications. From the viewpoint of large overcharge tolerance and safety performance, a LiFePO4 battery is similar to a lead-acid battery.

D) Higher energy density

The lithium iron phosphate (LiFePO4) cell is a non-aqueous system, having 3.2V as its nominal voltage during discharge. Its specific capacity is more than 145Ah/kg. Therefore, the gravimetric energy density of LiFePO4 battery is 130Wh/kg,

E) Simplified battery management system and battery charger

Large overcharge tolerance and self-balance characteristic of LiFePO4 battery can simplify the battery protection and balance circuit boards, lowering their cost.

F) Longer cycle life

In comparison with LiCoO2 battery which has a cycle life of 500-800 cycles, LiFePO4 battery extends its cycle life ranges 2000-5000 cycles.

G) High temperature performance

It is detrimental to have a LiCoO2 battery working at elevated temperature, such as 60°C. However, a LiFePO4 battery runs better at elevated temperature, offering 10% more capacity, due to higher lithium ionic conductivity.

H) What are the main applications of the lithium iron phosphate (LiFePO4)?

Due to the characteristics of lithium iron phosphate (LiFePO4), it is very suitable for high discharge rate occasions such as Solar Energy System, Emergency Lighting, UPS, power tools (for example, electric drill, electric motor saw, cropper) and EVs (Electric Vehicles). According to different applications, the design of battery pack can be modified to provide the best solution to satisfy the customer’s needs.

When batteries connect in parallels or series, first the 2 batteries or more, have to be in same SOC, (state of charge), the second, battery BMS max volts tolerance value has to be higher than the total battery pack. The third, the total battery bank max charge and discharge current should be less than single pack. The fourth, BMS has to have the functions like balancing. LEMAX batteries can be connected in Parallel up to 4, however when connecting in parallel the batteries need to be in same SOC. As for series connection, we need to do pre-setting before shipment. Therefore, need to tell our sales before order if there is demand for series connection.

No, our batteries have over discharge protection. What this means is that once the battery reaches 46.8v it switches off to protect itself（take 48V battery as example）.