Battery Machine Block

chestFull = false

function fillSlots(start, finish)
    for i=start,finish do
        turtle.select(i)
        while turtle.getItemCount() < 64 do
            turtle.suckUp(64-turtle.getItemCount())
        end
    end
end

function emptyInventory()
    for i=1,16 do
        turtle.select(i)
        item = turtle.getItemDetail()
        if item and item.name == "ic2:blockmachinelv" then
            dropped, message = turtle.dropDown()

            if not dropped then
                chestFull = true
                return
            else
                chestFull = false
            end
        end
    end
end

function craftMachineBlock()
    fillSlots(1, 3)
    fillSlots(5, 5)
    fillSlots(7, 7)
    fillSlots(9, 11)

    turtle.craft()
end

while true do
    while redstone.getInput("back") and not chestFull do
        emptyInventory()
        if not chestFull then
            craftMachineBlock()
        end
    end
    sleep(1)
end