diff --git a/main/battery.h b/main/battery.h
index f4b4c0c..6e92a60 100644
--- a/main/battery.h
+++ b/main/battery.h
@@ -12,7 +12,8 @@
     x(_22P) \
     x(HG2) \
     x(MH1) \
-    x(VTC5)
+    x(VTC5) \
+    x(BAK_25R)
 DECLARE_TYPESAFE_ENUM(BatteryCellType, : uint8_t, BatteryCellTypeValues)
 
 namespace {
@@ -61,7 +62,7 @@ float getBatteryPercentage(float batVoltage, BatteryCellType cellType)
             CURVE(3.56, 3.50, 2.25, 2.5)
             CURVE(3.50, 3.40, 2.5, 2.75)
             CURVE(3.40, 3.30, 2.75, 3.0)
-            CURVE(3.30, 2.5, 3.0, 3.2)
+            CURVE(3.30, 2.50, 3.0, 3.2)
             break;
         }
         case BatteryCellType::HG2: {
@@ -101,6 +102,23 @@ float getBatteryPercentage(float batVoltage, BatteryCellType cellType)
             CURVE(2.80, 2.50, 2.5, 2.60)
             break;
         }
+        case BatteryCellType::BAK_25R: {
+            const float expected_ah = 2.5;
+            if(cellVoltage > 4.15){
+                return 100;
+            }
+            CURVE(4.15, 4.06, 0, 0.25)
+            CURVE(4.06, 3.96, 0.25, 0.5)
+            CURVE(3.96, 3.88, 0.5, 0.75)
+            CURVE(3.88, 3.77, 0.75, 1)
+            CURVE(3.77, 3.68, 1, 1.25)
+            CURVE(3.68, 3.62, 1.25, 1.5)
+            CURVE(3.62, 3.56, 1.5, 1.75)
+            CURVE(3.56, 3.47, 1.75, 2)
+            CURVE(3.47, 3.31, 2, 2.25)
+            CURVE(3.31, 2.50, 2.25, 2.5)
+            break;
+        }
     }
     return 0.f;
 }
diff --git a/main/displays/menus/selectbatterytypemenu.h b/main/displays/menus/selectbatterytypemenu.h
index a0033c8..380ad63 100644
--- a/main/displays/menus/selectbatterytypemenu.h
+++ b/main/displays/menus/selectbatterytypemenu.h
@@ -42,6 +42,7 @@ namespace  {
             constructMenuItem<makeComponent<MenuItem, StaticText<TEXT_BATTERY_TYPE_HG2>,             BatterySelectTypeAction<BatteryCellType::HG2>>>();
             constructMenuItem<makeComponent<MenuItem, StaticText<TEXT_BATTERY_TYPE_MH1>,             BatterySelectTypeAction<BatteryCellType::MH1>>>();
             constructMenuItem<makeComponent<MenuItem, StaticText<TEXT_BATTERY_TYPE_VTC5>,            BatterySelectTypeAction<BatteryCellType::VTC5>>>();
+            constructMenuItem<makeComponent<MenuItem, StaticText<TEXT_BATTERY_TYPE_BAK_25R>,         BatterySelectTypeAction<BatteryCellType::BAK_25R>>>();
             constructMenuItem<makeComponent<MenuItem, StaticText<TEXT_BACK>,                         SwitchScreenAction<MainMenu>, StaticMenuItemIcon<&espgui::icons::back>>>();
         }
     };
diff --git a/main/texts.h b/main/texts.h
index fd7d226..e332f80 100644
--- a/main/texts.h
+++ b/main/texts.h
@@ -102,6 +102,7 @@ constexpr char TEXT_BATTERY_TYPE_22P[] = "22P cells";
 constexpr char TEXT_BATTERY_TYPE_HG2[] = "HG2 cells";
 constexpr char TEXT_BATTERY_TYPE_MH1[] = "MH1 cells";
 constexpr char TEXT_BATTERY_TYPE_VTC5[] = "VTC5 cells";
+constexpr char TEXT_BATTERY_TYPE_BAK_25R[] = "BAK / 25R cells";
 constexpr char TEXT_BATTERY_WHKM[] = "Wh per km";
 constexpr char TEXT_BATTERY_APPLYCALIB[] = "Apply calibration";
 constexpr char TEXT_VOLTAGECALIBRATION_RESET[] = "Reset calibration";