Charge is a system in Basement Moon, a mod for The Binding of Isaac.

A keyword used as a resource by certain Basement Moon items. Potency is capped at 99 and Count at 20. Potency appears to the left of its icon and Count to the right.

While Isaac holds Concept Extraction: Charge, using an active item that spends its charge consumes 3 Charge Count, or all remaining Count if fewer than 3 are available.
Every 10 Count consumed this way grants 1 Charge Potency. Partial progress carries over, including when continuing the run. Room-clear losses do not contribute to this progress.

While Concept Extraction: Charge is held:
→ +0.015 Fire rate per Charge Count, up to +0.3 at 20 Count.
→ +2% Damage per Charge Potency, up to +20% at 10 Potency.

Clearing a room consumes 1 Charge Count.

Potency and Count are independent: gaining Count does not automatically give Potency, and Potency remains when Count runs out.

Certain items also use Charge to strengthen their own effects.

• Download Basement Moon from the Steam Workshop.