EG-6
this series of power droids, similar to the GNK series, was manufactured by Veril Line Systems, and were marketed as ambulatory power generators built to support equipment and vehicles. A standard EG-6 could re-energize the power cells of a large, ground-based vehicle in about a day. Despite their utility, EG-6 droids were stupid at best, and would respond blindly to any command. There are many stories of children telling an EG-6 to walk off a balcony, just to see how high it would bounce. On a more sinister note, many Hutts have packed EG-6 droids with explosives and told them to walk off a ledge, plunging onto an enemy's speeder and destroying it. The Jawas that captured C-3PO and R2-D2 had also recently acquired a EG-6 droid, and had wiped its memory. The droid was stumbling around their Sandcrawler hold with the other droids.