Read EU Power

component = require("component")
term = require("term")
term.clear()
b = component.gt_batterybuffer
i = 1
totalbatteries = 0
nilcheck = b.getBatteryCharge(0)

while nilcheck ~= b.getBatteryCharge(i) do
  totalbatteries = totalbatteries + 1
  i = i + 1
end

if totalbatteries == 1 then
  st = 0.86
elseif totalbatteries == 2 then
  st = 0.80
elseif totalbatteries == 3 then
  st = 0.68
elseif totalbatteries == 4 then
  st = 0.60
elseif totalbatteries == 5 then
  st = 0.48
elseif totalbatteries == 6 then
  st = 0.40
elseif totalbatteries == 7 then
  st = 0.28
elseif totalbatteries == 8 then
  st = 0.20
elseif totalbatteries == 9 then
  st = 0.08
end

component.gpu.setResolution(15,5)

savedenergy = 0

while true do
  term.setCursor(1,1)
  i = 1
  energy = 0
  menergy = 0
  while i <= totalbatteries do
    energy = energy + b.getBatteryCharge(i)
    menergy = menergy + b.getMaxBatteryCharge(i)
    i = i + 1
  end
  energy = energy + b.getEUStored()

  if savedenergy == 0 then
    savedenergy = energy
  end

  menergy = menergy + b.getEUMaxStored()
  term.write("Total storage:")
  term.setCursor(1,2)
  term.write(energy.." /             ")
  term.setCursor(1,3)
  term.write(menergy.."              ")

  percent = math.floor(((energy / menergy) * 100) + 0.5)
  term.setCursor(1,4)
  term.write(percent.."% full        ")
  term.setCursor(1,5)
  if savedenergy > energy then
    temp = savedenergy - energy
    term.write("- "..temp.."         ")
  elseif savedenergy < energy then
    temp = energy - savedenergy
    term.write("+ "..temp.."         ")
  elseif savedenergy == energy then
    term.write("+/- 0                ")
  end
  savedenergy = energy
  os.sleep(st)
end