Battery Life Calculator | DigiKey Electronics (2024)

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Battery Life Calculator | DigiKey Electronics (1)

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Battery Life Calculator | DigiKey Electronics (2024)


What is the formula for calculating battery life? ›

To find battery lifetime, divide the battery capacity by the average device current consumption over time. You can then break it down into where: The average is the sum of the amount of current consumed when collecting data, scaled by the ratio of time that the device is collecting data.

How do you estimate battery life? ›

The life of a lithium-ion battery can be calculated using the formula: Life (in cycles) = (Capacity x 100) / (Discharge rate x Depth of discharge). Factors such as temperature, charge and discharge rate, and the amount of time the battery is stored before it is used can affect the life of a lithium-ion battery.

How long will a 3300 mAh battery last in hours? ›

A 3300 mAh battery will provide a maximum of 3300 milliamperes for one 1 hour. So 330 milliamperes for ten hours or 33 milliamperes for 100 hours. Simply divide the mAh value by the number of milliamperes drawn by the load to determine how long the battery will last.

What is the battery life of my device? ›

Open Settings > Battery > Battery Health & Charging. At the top, you'll see your battery's maximum capacity. Don't panic if it's below 100%. Your battery's designed to maintain 80% of its original capacity by 500 charges so that that percentage will tick down over time.

How long will a 200Ah battery run an appliance that requires 400W? ›

If the energy from the battery is used to power a 400W appliance, the 200Ah battery can run for approximately 11.04 hours.

How can you tell how much life is left in A battery? ›

Alkaline batteries bounce when they're going bad, so drop one on a hard surface to see whether or not it bounces. Take an exact voltage reading with a multimeter, voltmeter, or battery tester to get an exact charge reading. You can also use a multimeter or voltmeter to test your car battery.

How is battery life measured? ›

Battery capacity is typically measured in Amp-hours (Ah) or milliamp-hours (mAh), although Watt-hours (Wh) is occasionally used. An Amp-hour, also denoted as an Ampere-hour, is a measure of charge and equates to current flow over time. One Amp-hour is equal to one amp of continuous current flow for one hour.

What are battery calculations? ›

Understanding Battery Calculations

To determine how long your battery will last you have to calculate its total capacity and divide by the power. Let's say a battery is rated at 2300 amp hours with a current of 20 amps. You divide 2300 amp hours and 20 amps to get 115 hours of battery life.

How to check battery life? ›

Open your phone's Settings app. Under Battery, see how much charge you have left, and about how long it will last.

How can you predict battery life? ›

Given that batteries degrade with use and storage, predictive models of battery lifetime must consider the variety of electrochemical, thermal, and mechanical degradation modes, such as temperature, operating windows, charge/discharge rates, storage environment, and cycling patterns.

What determines the life of a battery? ›

The service life of a rechargeable battery depends on various factors. This includes all steps from storage to commissioning, as well as discharge and to a large extent the appropriate charging conditions. It is also related to the number of charge and discharge cycles.

How long will a 5000mAh battery last in hours? ›

Specifically, the "mAh" stands for milliampere-hour, which is the measurement unit for the energy capacity of batteries. A battery with a capacity of 5000mAh is capable of delivering a continuous current of 1A for 5 hours, or 0.5A for 10 hours, or 5A for 1 hour, and so on.

How long will a 8000 mAh battery last in hours? ›

An 8000mah battery indicates that it has the ability to power a 1000ma (1 amp) USB device for a maximum of 8 hours.

How long will a 4000 mAh battery last in hours? ›

For instance, if a device consumes 800 milliamps per hour (for example a mid-range smartphone or a small tablet), the battery would last approximately 5 hours (4000 mAh / 800 mA = 5 hours).

How long will my device run on battery? ›

In the ideal/theoretical case, the time would be Time(H) = Capacity(Ah)/Current(A). If the capacity is given in amp-hours and current in amps, time will be in hours (charging or discharging).

How do you calculate how long a battery backup will last? ›

(One amp-hour is a current flow of one amp for one hour.) If you want to know how long a given set of equipment will operate off a UPS battery, add up the current in amps that the equipment will pull and divide the amp hours of the UPS by that number. (e.g. A ½ amp load on a 2 amp-hour battery will run for 4 hours.)

How long will a 20Ah battery run? ›

So here is how you know that how many appliances you can run with a 20 ah battery. Runtime is equal to 20 A/29.17 A, or 0.686 hours. Therefore, you may run your appliances for roughly 0.686 hours, or about 41 minutes, using a 20Ah battery and a total load of about 29.17 amperes.

How do you calculate how long a battery will charge? ›

Example: Suppose the battery capacity is 200Ah, and the charging current is 20 amps. In this case, the battery charge time will be: Charge Time = 200Ah ÷ 20A = 10H.

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