local modem = peripheral.wrap("back")
local mfsu = {}  -- "mfsu" is now an empty table.

for i = 0,9 do
   mfsu[i+1] = peripheral.wrap("batbox_"..i)
end
local power = mfsu.getStored

while true do
  print ("Current Power: ")
  print (power)
  os.sleep(5)
end