Bug: Powering charged MFE with Bat-Pack = unlimited energy

public class TileEntityTransmit extends TileEntity implements IInventory
{ ...
    public void updateEntity()
    { ...
            if(furnaceItemStacks[1] != null && furnaceBurnTime <= powerStorage - 75 && furnaceItemStacks[1].stackSize == 1 && furnaceItemStacks[1].getItem().shiftedIndex == mod_IndustrialCraft.armorBatPackFull.shiftedIndex)
            {
                int i = (800 - furnaceItemStacks[1].getItemDamage()) * 75; 
                int l = powerStorage - furnaceBurnTime; 
                if(l < i)
                {
                    i = l;
                }
                i = i / 75 * 75; // energy transfer from BatPack to MFT is possible only in multiples of 75
                furnaceBurnTime += i; 
                int i1 = furnaceItemStacks[1].getItemDamage() + i / 75;
                // if(i1 >= 790) 790? why? BatPack has max 800
                if(i1 >= furnaceItemStacks[1].getMaxDamage())
                {
                    furnaceItemStacks[1] = new ItemStack(mod_IndustrialCraft.armorBatPackEmpty);
                } else
                {
                    furnaceItemStacks[1].setItemDamage(i1);
                }
            }
    ...
    }
...
}