Sharp Plug is a passive item.
Effects[ | ]
- Damages Isaac in exchange for fully recharging Isaac's current activated item.
Sharp Plug costs two hearts of health to use.
- Sharp Plug's heart cost is one half-heart per charge slot filled. The health cost is not increased in later stages where half-heart damage is upgraded to full heart.
- If the item has any charges, the Sharp Plug will not work.
Sharp Plug costs two hearts of health to use.
Sharp Plug's heart cost is one half-heart per charge slot filled. The health cost is not increased in later stages where half-heart damage is upgraded to full heart.Notes[ | ]
- If Isaac has less than two Black or Soul Hearts, it will remove them but will not remove any Red Hearts.
- Sharp Plug attempts to draw from Red Hearts first.
- Sharp Plug cannot deal fatal damage. If used at half a heart, it will not work.
Synergies[ | ]
- Damage-triggered items: Each half heart used up by activating Sharp Plug triggers damage effects separately, allowing multiple payouts.
- Habit: Each damage taken triggers the extra charge, which can be seen when Isaac has The Battery, or when using Sharp Plug without having enough health to fully charge the active.
- Glowing Hourglass: As long as Isaac has more than 2 full hearts, time can be rewinded indefinitely since the health used to recharge the item is refunded upon use.
- Jacob's Ladder / 120 Volt: Electricity deals 75% of Isaac's tear damage if he owns 1 of these items, to 100% if Isaac owns both.
- Keeper: The Keeper takes only one heart of damage.
- Expends health for charges at the rate of 2 charges per 1 Coin Heart. If an item is 1-charge, removes 1 Coin Heart.
- Schoolbag: The active item in the main slot is fully charged as normal and the secondary slot gains as many charges as the main one did.
- : Only the front item is charged.
- Tainted Magdalene: Tainted Magdalene's Yum Heart can be used infinitely, allowing for infinite invincibility frames from taking damage. Paired with Tainted Magdalene's melee attack, this can easily win a run.
- The Wafer: Reduces the health cost to half a heart (except for Keeper).
Interactions[ | ]
- 9 Volt: Renders the Sharp Plug unusable. Sharp Plug can only be used if the item is at 0 charges, but 9 Volt instantly gives 1 charge to the item upon activation.
- As Sharp Plug can now be used with charges and the cost is based on charges filled, 9 Volt now synergizes with Sharp Plug, lowering the cost of using it by half a heart on 2+ charge items.
- Alabaster Box: Expends up to 6 full hearts if possible with no charges given.
- Bethany / Tainted Bethany: Soul/blood charges are used before Sharp Plug when available.
- Eraser: Attempting to recharge the Eraser with the Sharp Plug fails and only hurts Isaac for half a heart.
- Holy Mantle: Holy Mantle blocks the damage from Sharp Plug if the shield is active, but also keeps Isaac's active item from charging.
- Bypasses the Holy Mantle and gives charges as usual.
- Isaac's Heart: Renders the Sharp Plug unusable.
- The Lost: No benefit from this item unless he has a respawn item because his active item's charge will not refill if the Holy Mantle effect activates. Sharp Plug only activates upon receiving actual damage.
- No effect, as The Lost doesn't have health.
- Tainted Jacob or White Fire Place Lost form: Activating Sharp Plug will take the health cost from the original character's health. Holy Mantle will not block the health cost.
- Lost form + Heartbreak: Every point of health taken to activate Sharp Plug is considered fatal damage, leaving Isaac with as little as half a soul heart. It is possible to get 12 Broken Hearts in addition to this final half heart, past the normal limit.
- Lost form +
- Mega Blast: Sharp Plug will not work with Mega Blast.
- Works as intended, giving 1 charge per half a heart.
In-game Footage[ | ]
 Active Item Modifiers
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 The Binding of Isaac: Rebirth
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