diff --git a/csharp/Lib/Devices/Battery48TL/Battery48TlRecord.Api.cs b/csharp/Lib/Devices/Battery48TL/Battery48TlRecord.Api.cs
index 7a6989768..e8f1320d3 100644
--- a/csharp/Lib/Devices/Battery48TL/Battery48TlRecord.Api.cs
+++ b/csharp/Lib/Devices/Battery48TL/Battery48TlRecord.Api.cs
@@ -27,6 +27,7 @@ public partial class Battery48TlRecord
     public Strings Alarms       => ParseAlarms()  .OrderBy(w => w).ToList();
 
     public Percent Soc => _Soc;
+    public Double  SOCAh  => _SOCAh;
     
     public Current BusCurrent     => _BusCurrent;
     public UInt16  BusCurrentHex  => _BusCurrentHex;
@@ -40,7 +41,7 @@ public partial class Battery48TlRecord
     // When The battery is full charged (reached EOC) the Time Since TOC is set to 0
     public TimeSpan TimeSinceTOC   => TimeSpan.FromMinutes(_TimeSinceToc);
 
-    public Boolean CalibrationChargeRequested => TimeSinceTOC > TimeSpan.FromDays(14);
+    public Boolean CalibrationChargeRequested => TimeSinceTOC > TimeSpan.FromDays(13); // Each 14 days , we do calibration. But there is wait time for all batteries to request and for next day calibration rule we put this 13 days
     
     public readonly struct Leds_
     {
diff --git a/csharp/Lib/Devices/Battery48TL/Battery48TlRecord.Modbus.cs b/csharp/Lib/Devices/Battery48TL/Battery48TlRecord.Modbus.cs
index 8d7882710..1c8435765 100644
--- a/csharp/Lib/Devices/Battery48TL/Battery48TlRecord.Modbus.cs
+++ b/csharp/Lib/Devices/Battery48TL/Battery48TlRecord.Modbus.cs
@@ -21,7 +21,8 @@ public partial class Battery48TlRecord
     [InputRegister(1001, Scale = 0.01)]                  private Double _BusVoltage;
     [InputRegister(1000, Scale = 0.01, Offset = -10000)] private Double _CellsCurrent;
     [InputRegister(1000)]                                private UInt16 _CellsCurrentHex;
-    
+    [InputRegister(1002, Scale = 0.1, Offset = -10000)]  private Double _SOCAh;
+
     
     [InputRegister(1062, Scale = 0.01, Offset = -10000)] private Double _BusCurrent;
     [InputRegister(1062)]                                private UInt16 _BusCurrentHex;
diff --git a/csharp/Lib/Devices/Battery48TL/Battery48TlRecords.cs b/csharp/Lib/Devices/Battery48TL/Battery48TlRecords.cs
index b4e96aaad..a59f34e22 100644
--- a/csharp/Lib/Devices/Battery48TL/Battery48TlRecords.cs
+++ b/csharp/Lib/Devices/Battery48TL/Battery48TlRecords.cs
@@ -11,6 +11,7 @@ public class Battery48TlRecords
     public required IReadOnlyList<String> Warnings                   { get; init; } 
     public required IReadOnlyList<String> Alarms                     { get; init; } 
     public required Percent               Soc                        { get; init; }
+    public required Double                SocAh                      { get; init; }
     public required Percent               CurrentMinSoc              { get; init; }
     public required Temperature           Temperature                { get; init; }
     public required DcPower               HeatingPower               { get; init; }
@@ -31,6 +32,7 @@ public class Battery48TlRecords
             Warnings                   = records.SelectMany(r => r.Warnings).Distinct().ToList(),
             Alarms                     = records.SelectMany(r => r.Alarms).Distinct().ToList(),
             Soc                        = records.Average(r => r.Soc.Value),
+            SocAh                      = records.Average(r => r.SOCAh),
             CurrentMinSoc              = records.Min(r => r.Soc.Value),
             Temperature                = records.Average(b => b.Temperatures.Cells.Average.Value),
             HeatingPower               = records.Sum(b => b.HeatingPower),