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diff --git a/src/Xmobar/Plugins/Monitors/Batt/FreeBSD.hs b/src/Xmobar/Plugins/Monitors/Batt/FreeBSD.hs
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+++ b/src/Xmobar/Plugins/Monitors/Batt/FreeBSD.hs
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+-----------------------------------------------------------------------------
+-- |
+-- Module      :  Plugins.Monitors.Batt.FreeBSD
+-- Copyright   :  (c) 2010, 2011, 2012, 2013, 2015, 2016, 2018, 2019 Jose A Ortega
+--                (c) 2010 Andrea Rossato, Petr Rockai
+-- License     :  BSD-style (see LICENSE)
+--
+-- Maintainer  :  Jose A. Ortega Ruiz <jao@gnu.org>
+-- Stability   :  unstable
+-- Portability :  unportable
+--
+-- A battery monitor for Xmobar
+--
+-----------------------------------------------------------------------------
+
+module Xmobar.Plugins.Monitors.Batt.FreeBSD (readBatteries) where
+
+import Xmobar.Plugins.Monitors.Batt.Common (BattOpts(..)
+                                           , Result(..)
+                                           , Status(..)
+                                           , maybeAlert)
+
+import Control.Monad (unless)
+import System.BSD.Sysctl (sysctlReadInt)
+
+battStatus :: Int -> Status
+battStatus x
+  | x == 1 = Discharging
+  | x == 2 = Charging
+  | otherwise = Unknown
+
+readBatteries :: BattOpts -> [String] -> IO Result
+readBatteries opts _ = do
+  lf <- sysctlReadInt "hw.acpi.battery.life"
+  rt <- sysctlReadInt "hw.acpi.battery.rate"
+  tm <- sysctlReadInt "hw.acpi.battery.time"
+  st <- sysctlReadInt "hw.acpi.battery.state"
+  acline <- sysctlReadInt "hw.acpi.acline"
+  let p = fromIntegral lf / 100
+      w = fromIntegral rt
+      t = fromIntegral tm * 60
+      ac = acline == 1
+      -- battery full when rate is 0 and on ac.
+      sts = if w == 0 && ac then Full else battStatus $ fromIntegral st
+  unless ac (maybeAlert opts p)
+  return (Result p w t sts)