diff --git a/configure.ac b/configure.ac
index 4fdb1ef33df..3abc230c2d5 100644
--- a/configure.ac
+++ b/configure.ac
@@ -434,6 +434,7 @@ AC_CHECK_HEADERS(\
 	arpa/nameser.h \
 	asm/types.h \
 	asm/user.h \
+	dev/acpica/acpiio.h \
 	dirent.h \
 	elf.h \
 	float.h \
diff --git a/dlls/ntdll/unix/system.c b/dlls/ntdll/unix/system.c
index 941c69190fb..76cfe30b5be 100644
--- a/dlls/ntdll/unix/system.c
+++ b/dlls/ntdll/unix/system.c
@@ -69,6 +69,9 @@
 # include <mach/mach_host.h>
 # include <mach/vm_map.h>
 #endif
+#ifdef HAVE_DEV_ACPICA_ACPIIO_H
+# include <dev/acpica/acpiio.h>
+#endif
 
 #define NONAMELESSUNION
 #include "ntstatus.h"
@@ -3516,6 +3519,49 @@ static NTSTATUS fill_battery_state( SYSTEM_BATTERY_STATE *bs )
     return STATUS_SUCCESS;
 }
 
+#elif defined(__FreeBSD__)
+
+static NTSTATUS fill_battery_state( SYSTEM_BATTERY_STATE *bs )
+{
+    size_t len;
+    int state = 0;
+    int rate_mW = 0;
+    int time_mins = -1;
+    int life_percent = 0;
+
+    bs->BatteryPresent = TRUE;
+    len = sizeof(state);
+    bs->BatteryPresent &= !sysctlbyname("hw.acpi.battery.state", &state, &len, NULL, 0);
+    len = sizeof(rate_mW);
+    bs->BatteryPresent &= !sysctlbyname("hw.acpi.battery.rate", &rate_mW, &len, NULL, 0);
+    len = sizeof(time_mins);
+    bs->BatteryPresent &= !sysctlbyname("hw.acpi.battery.time", &time_mins, &len, NULL, 0);
+    len = sizeof(life_percent);
+    bs->BatteryPresent &= !sysctlbyname("hw.acpi.battery.life", &life_percent, &len, NULL, 0);
+
+    if (bs->BatteryPresent)
+    {
+        bs->AcOnLine = (time_mins == -1);
+        bs->Charging = state & ACPI_BATT_STAT_CHARGING;
+        bs->Discharging = state & ACPI_BATT_STAT_DISCHARG;
+
+        bs->Rate = (rate_mW >= 0 ? -rate_mW : 0);
+        if (time_mins >= 0 && life_percent > 0)
+        {
+            bs->EstimatedTime = 60 * time_mins;
+            bs->RemainingCapacity = bs->EstimatedTime * rate_mW / 3600;
+            bs->MaxCapacity = bs->RemainingCapacity * 100 / life_percent;
+        }
+        else
+        {
+            bs->EstimatedTime = ~0u;
+            bs->RemainingCapacity = life_percent;
+            bs->MaxCapacity = 100;
+        }
+    }
+    return STATUS_SUCCESS;
+}
+
 #else
 
 static NTSTATUS fill_battery_state( SYSTEM_BATTERY_STATE *bs )
diff --git a/include/config.h.in b/include/config.h.in
index a0165765a85..9e650c04f7f 100644
--- a/include/config.h.in
+++ b/include/config.h.in
@@ -49,6 +49,9 @@
 /* Define to 1 if you have the <cups/ppd.h> header file. */
 #undef HAVE_CUPS_PPD_H
 
+/* Define to 1 if you have the <dev/acpica/acpiio.h> header file. */
+#undef HAVE_DEV_ACPICA_ACPIIO_H
+
 /* Define to 1 if you have the <dirent.h> header file. */
 #undef HAVE_DIRENT_H