#set timefmt "%h:%m"
#plot [] "charge_battery.data" using ($1-1201163274):2

set xdata time
set format x "%H:%M"
set grid xtics ytics

set term png medium transparent size 1280x1024
set output "battery_charge_cycle.png"
plot [] "charge_battery.data" using ($1-1201163274):2 smooth bezier
set output "battery_charging.png"
plot [] "battery_charging.data" using ($1-1201163274):2 smooth bezier
set output "battery_discharging.png"
plot [] "battery_discharging.data" using ($1-1201163274):2 smooth bezier

set term png medium transparent size 640x320
set output "battery_charge_cycle.mini.png"
plot [] "charge_battery.data" using ($1-1201163274):2 smooth bezier
set output "battery_charging.mini.png"
plot [] "battery_charging.data" using ($1-1201163274):2 smooth bezier
set output "battery_discharging.mini.png"
plot [] "battery_discharging.data" using ($1-1201163274):2 smooth bezier