#!/bin/bash

cat /proc/pmu/battery_0 \
	| grep time \
	| awk '{print $4}' \
	| xargs -I'{}' echo "{} / 60 / 60; {} / 60 % 60" \
	| bc \
	| while read line; do
		if [[ -z $n ]]; then
			n=1
			# Hours
			echo -n "${line}:"
		else
			# Minutes
			printf "%.2d\n" "$line"
		fi
	done