PCM for 4 Cells Lithium-Iron-Phosphate (LiFePO4)

LiFePO4 Cell Controller Protection unit (PCM) for 4 Rechargeable Cells in series


We have Cell Controllers that control many more cells (i.e. 3, 4, 5, 6, 8,10, 12, 15, 16 & 20 cells). Ask us for a quote by sending an email; info@e-transportation.eu

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64,00 € tax incl.


10 items in stock

Protects Chargeable Lithium-Ion Cells against Under-& Over Voltage and Over Current.


Specifications of 4 Series LiFePO4 Batteries Charge & Discharge Guard Shield

The product could be widely used in the fields of electric devices, electric vehicles, standby power supply and power supply of military equipment, etc.

Main Functions:
The product has 6 main functions: over charge, over discharge, over current, short circuits, balancing and low-current lock.

  1. Function of over charge protection: once voltage of any battery in the group gets higher than the over charge protection point, charge cuts off to ensure all batteries work within the over charge protection point.
  2. Function of over discharge: once voltage of any battery in the group gets lower than the over charge protection point, discharge cuts off to ensure all batteries work beyond the over charge protection point.
  3. Function of over current: during the discharge process of battery group, once discharge current gets over the set over current protection point, output cuts off to ensure battery group works within the safe limit of current.
  4. Function of short circuit protection: once battery group's output port appears the condition of short circuit, it cuts off to ensure battery group not to be damaged because of short circuit.
  5. Function of voltage balancing: in the late charging period of battery group, voltage difference that appears during the using process of each battery could get balancing revised to ensure battery group's capacitance.




Wiring diagram




Specified Types: 4S LFP PCM

Technical Index:



Battery Type

LiFePO4 Battery

Battery Cell

4 Cells

Input Charging Voltage


Input Charging Current


Continuous Discharge Current


Over Charge Detection Voltage (Cell)


Over Charge Release Voltage (Cell)


Over Discharge Detection Voltage (Cell)


Over Discharge Release Voltage (Cell)


Over Discharge Detection Current


Balance Open Voltage (Cell)


Balance Release Voltage (Cell)


Balance Current (Cell)


Short Circuit Protection


Detection Delay Time


Recovery Condition

Disconnect Load

Main Loop Electrify Resistance


Current Consume in Normal Operation


Dimension (mm)
75 x 50 x 1.6
Weight (gram)



B4; connect to the 4th battery positive terminal

B3; connect to the 3rd battery positive terminal

B2; connect to the 2nd battery positive terminal

B1; connect to the 1st battery positive terminal

B0; connect to the 1st battery negative terminal

B-; connect to the 1st battery negative terminal

P-; connect to the battery's output or the charger's negative terminal


Usage and Attention

  • After purchasing the protection mould, users should connect lines in compliance with the instruction. Voltage usually exists in the battery, so operators should peel one line and then connect another starting from B-. Lines should be connected from the low position to the high position with no mistake of order, or the irreparable damage could be caused.
  • When lines get connected, bits of copper and tin should not cling to the guard shield.
  • Protection board should be connected to battery group with compliance to specifications and any leading line should not be put on the back of the board but on the lateral side.
  • When equipping the guard shield, hard epoxy sheer should be fixed on the back of the board as the barrier to prevent the squeezing against short circuit.
  • When welding output lines, power supply line with the proper diameter should be chosen to prevent great temperature rising and great dropping of line voltage while high current discharges.
  • The guard shield is usually fixed in the battery box, insulation, heat relief and tightness should be greatly concerned, or the internal short circuit could lead to some danger.
  • The full-charged battery group should be put properly out of children's touch.
  • If any unusual condition appears during the using process, please stop using the product immediately.




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