> ## Documentation Index
> Fetch the complete documentation index at: https://docs.kobot.io/llms.txt
> Use this file to discover all available pages before exploring further.

# What is Efficacy?

Efficacy is the effectiveness of a received charge amount relative to the charge limit, calculated as **Charge Amount / Charge Received**. For a battery, the charge limit is 1% of its capacity.

Efficacy varies based on the charge received compared to the maximum possible charge, with examples demonstrating how efficacy decreases as the received charge exceeds the battery's charge limit.

<Note>
  **Numeric values are defined in Watts; 1W = 1000J**

  * **Charge Efficacy** is the effectiveness (determined by charge limit) of a received charge amount and calculated by: `Charge Amount / Charge Received`
  * **Charge limit (for Battery)** is 1% of Capacity (e.g., 1000W Battery, 10W is maximum that can be received)
</Note>

### Examples of Charge Efficacy using 1000W Battery

**Example I:**

```text theme={null}
Given 1000W Battery
When receiving 500W charge
Then maximum charge is 10W
And efficacy is 2%
```

**Example II:**

```text theme={null}
Given 1000W Battery
When receiving 100W charge
Then maximum charge is 10W
And efficacy is 10%
```

**Example III:**

```text theme={null}
Given 1000W Battery
When receiving 10W charge
Then maximum charge is 10W
And efficacy is 100%
```

**Example IV:**

```text theme={null}
Given 1000W Battery
When receiving 5W charge
Then maximum charge is 5W
And efficacy is 100%
```