Wh to mAh Conversion: Your Guide to Power Calculations

When dealing with batteries, portable power stations, and other energy storage devices, understanding how to convert between watt-hours (Wh) and milliampere-hours (mAh) can be incredibly useful. This article will guide you through the basics of Wh to mAh conversion, answer common questions, and provide tables to make calculations easier.

What Are Watt-Hours (Wh) and Milliampere-Hours (mAh)?

Before we dive into conversions, let’s clarify what Wh and mAh represent:

Watt-hours (Wh) is a measure of energy. It tells you how much power (in watts) is used over a period of one hour. For example, if a battery has a capacity of 100Wh, it can theoretically supply 100 watts for one hour.

Milliampere-hours (mAh), on the other hand, measure electrical charge. It represents the total amount of charge a battery can hold. The higher the mAh rating, the longer the battery can supply current.

Why Convert Between Wh and mAh?

You might need to convert between Wh and mAh when comparing the capacities of different batteries or power stations, especially when they’re rated in different units. This is common in products like portable power stations, smartphones, and other rechargeable devices.

Conversion Formula For Wh to mAh

The key to converting Wh to mAh is the battery voltage (V), as energy capacity and charge capacity are related by voltage. Here’s the basic formula:

mAh=Wh×1000/V

And to convert from mAh to Wh:

Wh=mAh×V/1000

In both formulas:

* Wh is the energy capacity in watt-hours.

* mAh is the charge capacity in milliampere-hours.

* V is the battery voltage in volts.

Example Conversion Table for Common Voltages

For example, if you have a 1 Wh battery rated at 3.7 V, the capacity in milliampere-hours (mAh) is 1 Wh × 1000 / 3.7V ≈ 270.3 mAh. Here’s a table that shows conversions from Wh to mAh for common voltages:

This table helps quickly convert between Wh and mAh based on various voltage levels.

Step-by-Step Conversion Examples

Converting Wh to mAh

Let’s say you have a 20Wh battery operating at 5 volts. Using the formula:

mAh=20×1000/5=4000 mAh

This means the battery has a capacity of 4000mAh at 5 volts.

Converting mAh to Wh

For a battery rated at 5000mAh and 3.7 volts, the calculation would be:

Wh=5000×3.7/1000=18.5 Wh

This battery has an energy capacity of 18.5Wh.

Frequently Asked Questions on Power Conversion

1. How to Convert 1000 Amps to mAh?

Since 1000 amps is a very high current, it’s uncommon to convert it directly to mAh without knowing voltage and time. If you’re looking at 1000 milliamps (1 amp) and want to convert it to mAh, it simply depends on the duration of usage. For instance, running a 1 amp device for 1 hour equals 1000mAh.

2. Converting kWh to mAh

Kilowatt-hours (kWh) can be converted to milliampere-hours (mAh) if you know the voltage. Use the formula:

mAh=kWh×1,000,000/V

For example, if you have a 1kWh battery and a voltage of 12V:

mAh=1×1,000,000/12=83,333 mAh

3. Converting mAh to Watt

To find the power in watts from mAh, you need to know both the voltage and the time duration. The mAh value by itself doesn’t give the complete power rating in watts but indicates the charge capacity.

4. Converting mAh to Wh

As shown above, you can convert mAh to Wh by using:

Wh=mAh×V/1000

This calculation is useful for comparing devices with different capacity units, like portable power stations.

Conversion Chart for Portable Devices

For quick reference, here’s a chart converting mAh to Wh for typical voltages in portable devices:

Running Time Explanation

A power station’s running time depends on two main factors: the device’s wattage and the power station’s watt-hour (Wh) capacity. Understanding this relationship lets you calculate the practical application of a power station’s capacity for your devices. For instance, if you’re running a 60W fan on a 768Wh power station, divide the watt-hour rating by the appliance wattage (768Wh ÷ 60W), giving you about 12.8 hours of fan operation.

Featured Portable Power Stations

Now that you have a grasp on converting Wh to mAh, let’s explore some standout portable power stations designed to keep devices charged and running when you’re off the grid.

1. BLUETTI Elite 300 Portable Power Station

The BLUETTI Elite 300 is BLUETTI's most compact 3kWh-class station, pairing a 3,014Wh LiFePO₄ pack with 2,400W of continuous AC output and a 4,800W Power Lifting Mode for heavy resistive loads. It carries a NEMA TT-30 port for direct RV hookup, switches over in 10ms as a UPS, and is rated for 6,000+ cycles to 80% capacity. It supports AC, solar, car and generator recharging, and control via the BLUETTI app over Bluetooth and WiFi makes the Elite 300 convenient and dependable for outdoor camping or as a backup power source in the house.

Running Times for Household Appliances With BLUETTI Elite 300 (3,014Wh)

• Drone (40Wh): ~66.6 Times
• Laptop (70Wh): ~38.0 Times
• TV (65W): ~41.0 Hours
• Table fan (75W): ~35.5 Hours
• Space Heater (350W): ~7.6 Hours

2. BLUETTI Elite 100 V2 Portable Power Station

For those who want versatility and sustainability without any compromise due to limited AC output, the BLUETTI Elite 100 V2 is perfect for them. The AC output is 1,800W with a 2,700W Power Lifting Mode, backed by a 1,024Wh LiFePO₄ pack rated for 4,000+ cycles. 

Within this model, a total of four recharging options are provided; AC, Solar, Car, Generator depending on the surroundings that the user finds his or herself in. The battery can also be quickly recharged via 1,200W AC TurboBoost input, and it takes only about forty-five minutes to reach eighty percent, or roughly seventy minutes to full with 1,000W of solar input. At 11.5kg and 30dB under light loads, the Elite 100 V2 is ideal for users seeking an eco-friendly, quiet, and efficient power solution for camping, RV trips, or emergency preparedness.

Running Times for Household Appliances With BLUETTI Elite 100 V2 (1,024Wh)

• Drone (40Wh): ~22.6 Times
• Laptop (70Wh): ~12.9 Times
• TV (65W): ~13.9 Hours
• Table fan (75W): ~12.1 Hours
• Space Heater (350W): ~2.6 Hours

3. BLUETTI Elite 200 V2 Portable Power Station

The BLUETTI Elite 200 V2 Portable Power Station features an excellent power-to-size ratio, supporting a continuous 2,600W output with a 3,900W power lifting mode for handling demanding loads. It has a large capacity of 2,073.6Wh (often rounded to ~2,074Wh) and ultra-fast TurboBoost charging, reaching 80% in about 50-60 minutes (or ~1 hour in some specs), making it ideal for frequent recharge cycles in short periods. 

It uses premium LiFePO₄ (LFP) batteries with 6,000+ charge cycles for exceptional long-term durability and health. The unit offers multiple output ports (up to 9 devices simultaneously, including 4 AC outlets, USB-C, USB-A, and more), plus smart remote control via the BLUETTI app. Despite its higher capacity, it's remarkably compact and efficient compared to similar models, making it an outstanding choice for home emergency backup during outages or extended camping/RV adventures.

Running Times for Household Appliances With BLUETTI Elite 200 V2 (2,073.6Wh)

These are approximate estimates. Actual runtime varies with inverter efficiency, depth of discharge and real-world conditions.

• Drone (40Wh): ~45-50 Times
• Laptop (70Wh): ~22-25 Times
• TV (65W): ~22-24 Hours
• Table fan (75W): ~20-22 Hours
• Space Heater (350W): ~4.5-5 Hours

All of these portable power stations come with different features that make them suitable for use during camping, as well as for emergency power supplies. To determine the energy capacity of Wh with respect to mAh, one needs to know how to convert Wh to mAh and then decide on which model is apt for you.

Real-World Charging and Running Times

To give you a clear sense of the practical capabilities of each BLUETTI power station, let’s break down how many times they can charge a typical device - such as a mobile phone, and how long they’ll power essential appliances.

How Many Times Can You Charge a Mobile Phone?

Let’s consider a standard mobile phone with a 4000 mAh battery rated at 3.7 volts. The formula to calculate the phone’s energy requirement in watt-hours (Wh) is:

Phone Battery Wh=mAh×Voltage/1000 = 4000×3.7/1000= 14.8 Wh 

Now, using the power capacity of each BLUETTI power station, let’s determine how many times they can fully charge a 4000 mAh mobile phone battery. Running time = Battery capacity × DoD × η ÷ Device rated power. DoD refers to Depth of Discharge and η is local inverter efficiency. Take the Elite 300 as an example, its DoD and η are 95% and 93%.

BLUETTI Elite 300 Portable Power Station (3,014Wh):

Charges = 3,014 Wh × 0.95 × 0.93 / 14.8 Wh ≈ 180 full charges

This provides a practical perspective on how well the Elite 300 power station would serve someone needing to recharge their phone during a trip or in a power outage.

Final Words

All in all, understanding the capacity of a power station in watt-hours (Wh) and how to convert it to milliamp-hours (mAh) gives you insight into its battery life and charging capabilities. Knowing the mAh rating helps assess how long a power station will keep your devices running, providing you with reliable power during emergencies or on trips. 

This information allows you to choose a power station that fits your needs, whether you’re planning for extensive off-grid usage or need a backup for essential household devices.