To Complete the achievement all you have to do is plug three batteries into a vertical door with the volt meter on it.

If you have been running into the same problem i have this refused to work no matter how you configured the wires. So heres what ive found.

So turns out this battery is dead. i always thought it wasnt powerful enough to power the door, and plugged the charger (what i thought as simply a generator) into the door instead.







Simply plug the dead battery into the charger and wait for the light to change green, and voila.


Proceed through the level until you have three batteries and return to the forklift area.

Connect batteries in such a way that the two side batteries act as extensions between the door and battery #3 and achievement should pop. If it does not it means you didnt charge the battery fully in step one.