Lihzahrd Power Cell

Lihzahrd Power Cells are used at a Lihzahrd Altar located at the end of the Lihzahrd Temple to summon the Golem boss. They are found within Lihzahrd Chests. They also can drop off Lihzahrds, but only at a 0.5% drop rate (1 in 200 chance). This means that they can be farmed from Lihzahrds, but there is a better alternative if you have an extra Temple Key from killing Plantera, or a Picksaw from killing Golem; you can simply generate a new world and gather new power cells from that world's Lihzahrd Temple.

As of update 1.2.3, the Golem can only be summoned after Plantera has been defeated. This means that the above method of generating new worlds and looting the Lihzahrd Power Cells is obsolete. Also, due to the recent update, Plantera requires all three Mechanical Bosses to be defeated before it can be summoned, placing a great prerequisite on the Golem fight.