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4.5 Volt item
4.5 Volt is a passive item in The Binding of Isaac, added in the Repentance DLC.
Description
Prevents Isaac's active items from charging normally when clearing rooms.
Instead, active items are now charged when enemies take damage from any source.
Charges are gained at a rate of 40 + 20 × CurrentStage. For example, in Basement I it takes 60 damage to gain 1 charge, while in Home it takes 300 damage.
If an enemy receives more damage than their maximum amount of health, the excess amount will not be counted towards the recharge formula.
Note
This page shows the latest information as of the new Repentance+ (Online Co-op) DLC.
To see information about this item for the previous Repentance version, check this page instead.
Item pools
4.5 Volt can be found in the following item pools:
| Name | Weight |
|---|---|
| Shop |
1.0/1.0
|
| Battery Bum |
1.0/1.0
|
| Greed Shop |
1.0/1.0
|
Tags
The following tags are applied to this item:
| Id | Description |
|---|---|
| battery | Contributes towards unlocking  Jumper Cables. |
| summonable | Can be summoned via  Lemegeton. |
| offensive | Can appear for  Tainted Lost. |
| nocantrip | Not available as card effects during the Cantripped! challenge. |
Special synergies
The following special synergies and interactions for 4.5 Volt have been documented.
| Mod | Item | Synergy |
|---|---|---|
| --- | Abyss | Spawns an electrical cyan locust that has a chance to chain-zap enemies similar to the effects of  Jacob's Ladder. Zaps deal 0.1 damage. |
* Note that not all possible synergies and interactions are listed here.
YouTube video
External links
- Check out the item description on the external Isaac Wiki.
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