diff --git a/i3pystatus/battery.py b/i3pystatus/battery.py
index 4fe4fdd..dc8e756 100644
--- a/i3pystatus/battery.py
+++ b/i3pystatus/battery.py
@@ -69,7 +69,7 @@ class BatteryCharge(Battery):
 
     def consumption(self):
         if "VOLTAGE_NOW" in self.battery_info and "CURRENT_NOW" in self.battery_info:
-            return super().consumption(self.battery_info["VOLTAGE_NOW"] * self.battery_info["CURRENT_NOW"])  # V * A = W
+            return super().consumption(self.battery_info["VOLTAGE_NOW"] * abs(self.battery_info["CURRENT_NOW"]))  # V * A = W
         else:
             return None
 
diff --git a/tests/test_battery.py b/tests/test_battery.py
index dd9c6b6..5d63c51 100644
--- a/tests/test_battery.py
+++ b/tests/test_battery.py
@@ -24,6 +24,7 @@ def battery_test(path, format, expected):
     ("test_battery_132", "DIS", "8.370", "1h:17m"),
     ("test_battery_broken1", "FULL", "0.000", "0h:00m"),
     ("test_battery_issue89_2", "DIS", "0.000", "0h:00m"),
+    ("test_battery_issue729", "DIS", "4.341", "4h:32m")
 ])
 def test_basic(path, status, consumption, remaining):
     battery_test(path, "{status}", status)
diff --git a/tests/test_battery_issue729 b/tests/test_battery_issue729
new file mode 100644
index 0000000..e2f3ba6
--- /dev/null
+++ b/tests/test_battery_issue729
@@ -0,0 +1,24 @@
+POWER_SUPPLY_NAME=sbs-104-000b
+POWER_SUPPLY_STATUS=Discharging
+POWER_SUPPLY_CAPACITY_LEVEL=Normal
+POWER_SUPPLY_HEALTH=Unknown
+POWER_SUPPLY_PRESENT=1
+POWER_SUPPLY_TECHNOLOGY=Li-ion
+POWER_SUPPLY_CYCLE_COUNT=149
+POWER_SUPPLY_VOLTAGE_NOW=7766000
+POWER_SUPPLY_CURRENT_NOW=-559000
+POWER_SUPPLY_CAPACITY=67
+POWER_SUPPLY_TEMP=279
+POWER_SUPPLY_TIME_TO_EMPTY_AVG=15540
+POWER_SUPPLY_TIME_TO_FULL_AVG=3932100
+POWER_SUPPLY_SERIAL_NUMBER=0fdb
+POWER_SUPPLY_VOLTAGE_MIN_DESIGN=7500000
+POWER_SUPPLY_VOLTAGE_MAX_DESIGN=7500000
+POWER_SUPPLY_ENERGY_NOW=18640000
+POWER_SUPPLY_ENERGY_FULL=28890000
+POWER_SUPPLY_ENERGY_FULL_DESIGN=30600000
+POWER_SUPPLY_CHARGE_NOW=2542000
+POWER_SUPPLY_CHARGE_FULL=3811000
+POWER_SUPPLY_CHARGE_FULL_DESIGN=4080000
+POWER_SUPPLY_MANUFACTURER=SDI
+POWER_SUPPLY_MODEL_NAME=4302D40