EG4® LL & LP4 24V
200AH BATTERY
SOC RECALIBRATION GUIDE
PURPOSE
For use after a Battery Management System’s (BMS) Printed Circuit Board (PCB) replacement has been completed. The new BMS PCB will not accurately know the battery cell pack it is managing. Due to this new learning curve, the BMS will need to learn the cell pack’s State of Health % (SOH = Total Remaining Capacity) and the State of Charge % (SOC = Actual Remaining Capacity). SOC% drift is a natural occurrence that can occur over time if the battery is never Top Balanced or Bottom Balanced.
TOP BALANCING
The EG4-LL and LifePower4 line of batteries will automatically recalibrate the SOC to 100% whenever one cell has reached the Cell Overvoltage Alarm at 3.8V while charging. To ensure this happens, use a DC charger that is SAFE to use with Lithium-Ion batteries, or specifically a LiFePO4 (Lithium Ferrous Phosphate) battery charger. Apply a 28VDC charging voltage at 100A. This will ensure a safe power threshold for the battery to reach the Cell Overvoltage Alarm at 3.8V. Once this alarm occurs, the SOC will round to 100%.
BOTTOM BALANCING
The EG4-LL and LifePower4 line of batteries will automatically recalibrate the SOC to 0% whenever one cell has reached the Cell Under voltage alarm at 2.3VDC.
To ensure this happens, use a 24VDC load bank or inverter. Apply a 100A discharge current to the individual battery. This will ensure a safe power threshold for the battery to reach the Cell Under voltage alarm at 2.3VDC. Once this alarm occurs, the SOC will round down to 0%.
BATTERY COMPATIBILITY
EG4® LL 24V 200Ah V1 & V2 and LifePower4 24V 200Ah V1 & V2 batteries
NOTE:
A monthly maintenance routine should be performed to ensure the SOC recalibration remains accurate. It is recommended to perform the recalibration once a month to ensure the battery bank remains calibrated.
©2025 EG4® ELECTRONICS, LLC. ALL RIGHTS RESERVED.
VERSION 1.0 | INFORMATION SUBJECT TO CHANGE WITHOUT NOTICE.
Documents / Resources
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EG4 ELECTRONICS EG4-24V-LL 200AH Lithium Iron Phosphate Battery [pdf] User Guide EG4-24V-LL, LifePower4 V2 24V, EG4-24V-LL 200AH Lithium Iron Phosphate Battery, 200AH Lithium Iron Phosphate Battery, Lithium Iron Phosphate Battery, Phosphate Battery, Battery |