Also known as T501-Non-Rechargeable Energy Storation Unit pose 1000 Eu thats 9000 Eu less than their rechargeable counterparts... and you can't recharge them. However, they are much easier to produce in quantities and are much more easily transportable.
|Storage||1.000 (per battery)|
Using Single use batteries is more efficient than burning the coal.
Coal holds 4000 EU. Making dust costs 625 EU + 500 for the Redstone = 5125 EU
You only have to think of what's worth more: 2875 EU and the portability, or 1 Cable.