The watt hours (Wh) for 4000mAh depends on the voltage (V) of the battery or device. Assuming a voltage of 3.7V, which is common for many lithium-ion batteries, 4000mAh equates to 14.8Wh.
To calculate watt hours from milliamp hours, you use the following formula:
*Wh = (mAh / 1000) V**
Where:
- Wh = Watt-hours
- mAh = Milliamp hours
- V = Voltage
Let's illustrate with examples using different voltage levels:
Example 1: 3.7V (Typical for Smartphones/Power Banks)
Wh = (4000 mAh / 1000) 3.7 V
Wh = 4 3.7
Wh = 14.8 Wh
Example 2: 5V (USB Power)
Wh = (4000 mAh / 1000) 5 V
Wh = 4 5
Wh = 20 Wh
Example 3: 12V (Some Electronics/Batteries)
Wh = (4000 mAh / 1000) 12 V
Wh = 4 12
Wh = 48 Wh
Therefore, to accurately determine the watt hours, it's essential to know the voltage. Without the voltage, it's impossible to provide a precise watt-hour figure. If no voltage is specified, assuming 3.7V is a reasonable default for many portable electronics.
In summary, while 4000mAh is a measure of charge capacity, watt-hours represent the total energy a battery can deliver. It's crucial to consider the voltage to convert mAh to Wh correctly.
