diff --git a/variants/lilygo_tdeck_max/TDeckProMaxBoard.h b/variants/lilygo_tdeck_max/TDeckProMaxBoard.h
index 02f71386..9660aac7 100644
--- a/variants/lilygo_tdeck_max/TDeckProMaxBoard.h
+++ b/variants/lilygo_tdeck_max/TDeckProMaxBoard.h
@@ -39,7 +39,7 @@
 #define BQ27220_I2C_ADDR 0x55
 
 #ifndef BQ27220_DESIGN_CAPACITY_MAH
-#define BQ27220_DESIGN_CAPACITY_MAH  2500
+#define BQ27220_DESIGN_CAPACITY_MAH  1400
 #endif
 
 class TDeckProMaxBoard : public ESP32Board {
diff --git a/variants/lilygo_tdeck_max/variant.h b/variants/lilygo_tdeck_max/variant.h
index 20522716..07149c09 100644
--- a/variants/lilygo_tdeck_max/variant.h
+++ b/variants/lilygo_tdeck_max/variant.h
@@ -239,8 +239,8 @@
 #define BQ27220_I2C_ADDR 0x55
 #define BQ27220_I2C_SDA I2C_SDA
 #define BQ27220_I2C_SCL I2C_SCL
-#define BQ27220_DESIGN_CAPACITY 2500    // 
-#define BQ27220_DESIGN_CAPACITY_MAH 2500 // Alias used by TDeckBoard.h
+#define BQ27220_DESIGN_CAPACITY 1400    // 
+#define BQ27220_DESIGN_CAPACITY_MAH 1400 // Alias used by TDeckBoard.h
 
 #define HAS_PPM 1
 // This board uses the SY6970 charger @ 0x6A (newer revision -- confirmed by I2C