Energy cell

cell = peripheral.wrap('bottom')
monitor = peripheral.wrap('front')
--energyStored = cell.getEnergyStored()
--energyMax = cell.getEnergyCapacity()
function getTransferRate()
    local energyBefore = cell.getEnergyStored()
    sleep(1)
    local energyStored = cell.getEnergyStored()
    energyTransfer = (energyStored-energyBefore)/20
    if energyTransfer == 0 then
        --print(energyTransfer)
        return 0
    else
        --print(energyTransfer)
        return energyTransfer
    end
end
while true do
    local energyStored = cell.getEnergyStored()
    local energyMax = cell.getEnergyCapacity()
    transferRate = getTransferRate()
    monitor.clear()
    monitor.setCursorPos(2,5)
    if energyStored > 0.75*energyMax then
        monitor.setTextColor(0x2000)
    elseif energyStored < 0.75*energyMax and energyStored > 0.1*energyMax then
        monitor.setTextColor(0x10)
    elseif energyStored < 0.1*energyMax then
        monitor.setTextColor(0x4000)
    end
    --print(energyStored/energyMax.."//"..(energyStored/energyMax)*100)
    --if (energyStored/energyMax)*100 > 0.00000075*energyMax then
    --  print("true")
    --end
    monitor.write(energyStored.."/"..energyMax)
    monitor.setTextColor(0x1)
    monitor.write(" RF Stored")
    monitor.setCursorPos(12,8)
    if transferRate > 0 then
        monitor.setTextColor(0x2000)
    elseif transferRate < 0 then
        monitor.setTextColor(0x4000)
    elseif transferRate == 0 then
        monitor.setTextColor(0x10)
    end
    monitor.write(transferRate)
    monitor.setTextColor(0x1)
    monitor.write(" rf/t")
    sleep(1)
end