This Perk is present in two (Official) maps, Observation Deck and Halls of Survival. First coming into play in Observation deck, Charge completely changed the camping element of previous maps, with charge you were able to safely run circles around zombies. Charge is bought for 3000 points (Zombiecraft 2.x. Zombiecraft 3: 500) and allows you to push a mappable button making your speed 150% faster and invincible for a short period of time.
In Zombiecraft 3, this cannot be reused. Once used you may rebuy it, but it will not come back without paying for it again.