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diff --git a/99-on-battery-time.rules b/99-on-battery-time.rules
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+# Rule for when switching to battery
+# File: /etc/udev/rules.d/99-on-battery-time.rules
+# References:
+#    http://www.reactivated.net/writing_udev_rules.html
+#    https://opensourceforu.com/2012/06/some-nifty-udev-rules-and-examples/
+#    https://superuser.com/questions/1417292/udev-rule-to-start-a-command-on-ac-battery-plug-unplug-event
+#    https://bbs.archlinux.org/viewtopic.php?id=136396
+#    https://duckduckgo.com/?q=linux+how+long+has+laptop+been+running+on+battery+-life&ia=web
+SUBSYSTEM!="power_supply", GOTO="onbattery_end"
+ENV{POWER_SUPPLY_ONLINE}=="0", RUN+="/usr/local/bin/onbattery.sh"
+ENV{POWER_SUPPLY_ONLINE}=="1", RUN+="/usr/local/bin/onac.sh"
+LABEL="onbattery_end"
diff --git a/README b/README
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+++ b/README
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+Futureimprovements
+* add docs
+* document dependencies
+* build makefile
+* build rpm
+* build dpkg
diff --git a/on-battery-time.sh b/on-battery-time.sh
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+#!/bin/sh
+# File: /usr/local/bin/on-battery-time.sh
+# Author: bgstack15
+# Startdate: 2019-06-09 22:35
+# Title: Report how long this system has been on battery or AC power
+# Package: on-battery-time
+# Purpose:
+# History:
+# Usage:
+# Reference:
+#    https://stackoverflow.com/questions/12199631/convert-seconds-to-hours-minutes-seconds/18683834#18683834
+# Improve:
+# Dependencies:
+#    bc
+#    date
+#    the udev rules from 99-on-battery-time.rules
+# Documentation:
+
+OBT_INFILE=/var/log/battery.log
+
+# FUNCTIONS
+convertsecs() {
+    _h=$( expr $1 / 3600 )
+    _m=$( expr $1  % 3600 / 60 )
+    _s=$( expr $1 % 60 )
+    printf "%02d:%02d:%02d\n" ${_h} ${_m} ${_s}
+}
+
+# learn most recent utility time
+last_utility_time="$( { tac "${OBT_INFILE}" | awk '/utility power/{print $2}' ; echo 0 ; } | head -n1 )"
+
+# learn most recent battery time
+last_battery_time="$( { tac "${OBT_INFILE}" | awk '/on battery/{print $2}' ; echo 0 ; } | head -n1 )"
+
+# learn current time
+OBT_current_time="$( date "+%s" )"
+
+if test ${last_utility_time} -ge ${last_battery_time} ;
+then
+   OBT_last="${last_utility_time}"
+   OBT_phrase="utility power"
+else
+   OBT_last="${last_battery_time}"
+   OBT_phrase="on battery"
+fi
+
+OBT_seconds="$( printf "%s-%s\n" "${OBT_current_time}" "${OBT_last}" | bc )"
+
+printf "%s seconds: %s\n" "${OBT_phrase}" "${OBT_seconds}"
+convertsecs "${OBT_seconds}"
diff --git a/onac.sh b/onac.sh
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+++ b/onac.sh
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+#!/bin/sh
+# File: /usr/local/bin/onac.sh
+# the hash-bang is vital for eudev to be able to execute this script.
+date -u "+$( hostname -s ) %s %FT%TZ now using utility power" >> /var/log/battery.log
diff --git a/onbattery.sh b/onbattery.sh
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+++ b/onbattery.sh
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+#!/bin/sh
+# File: /usr/local/bin/onbattery.sh
+# the hash-bang is vital for eudev to be able to execute this script.
+date -u "+$( hostname -s ) %s %FT%TZ now running on battery" >> /var/log/battery.log