diff --git a/headers/private/device/power_managment.h b/headers/private/device/power_managment.h
index 2e5cc0c974..180a7de1b7 100644
--- a/headers/private/device/power_managment.h
+++ b/headers/private/device/power_managment.h
@@ -19,13 +19,20 @@ enum {
 	// has changed
 	WATCH_CPU_FREQ,
 	// stop all watching ioctl, ioctl return B_ERROR
-	STOP_WATCHING_CPU_FREQ
+	STOP_WATCHING_CPU_FREQ,
+	
+	GET_BATTERY_INFO,
+	GET_EXTENDED_BATTERY_INFO,
+	WATCH_BATTERY,
+	STOP_WATCHING_BATTERY
+	
 }; 
 
 // CPU Frequence:
 // magic id returned by IDENTIFY_DEVICE
 const uint32 kMagicFreqID = 48921;
 
+
 #define MAX_CPU_FREQUENCY_STATES 10
 
 typedef struct {
@@ -36,4 +43,38 @@ typedef struct {
 } freq_info;
 
 
+// ACPI Battery:
+// magic id returned by IDENTIFY_DEVICE
+const uint32 kMagicACPIBatteryID = 17822;
+
+#define BATTERY_DISCHARGING		0x01
+#define BATTERY_CHARGING		0x02
+#define BATTERY_CRITICAL_STATE	0x04
+
+
+typedef struct {
+	int		state;
+	int		current_rate;
+	int 	capacity;
+	int		voltage;
+} acpi_battery_info;
+
+
+typedef struct {
+	int		power_unit;
+	int		design_capacity;
+	int		last_full_charge;
+	int		technology;
+	int 	design_voltage;
+	int		design_capacity_warning;
+	int		design_capacity_low;
+	int		capacity_granularity_1;
+	int		capacity_granularity_2;
+	char	model_number[32];
+	char	serial_number[32];
+	char	type[32];
+	char	oem_info[32];	
+} acpi_extended_battery_info;
+
+
 #endif