22 Years' Battery Customization
Oct 20, 2022 Pageview：801
Introduction
Every battery-powered device vendor claims the amount of time their product can operate on a single set of batteries. They might promote "two hundred hours," "one thousand activations," or "six months of typical use," but frequently this information is presented without any explanation. We want to demystify the procedure so you will know what it meant the next time you see a claim about battery life.
How do you calculate how long a battery will last with watts?
If a battery's capacity is expressed in terms of Watt Hours, you must know the voltage and current drawn from the battery to determine how long the battery will last. Ampere multiplied by voltage is how watt is defined. Therefore, if a 5-volt battery is rated at 20-watt hours and uses 2 amps of current, its output power is 10 watts ( 5 Volts x 2 Ampere). It will last for two hours. If the battery voltage and watt-hour are known, the calculator will compute the battery life.
This is the equation:
Battery Life = Watt Hours/ ( Voltage x Current in Ampere)
Based on nominal battery capacity and average current drawn by a load, the battery life calculator calculates how long a battery will last. Watt-hours (Wh) are also rarely used, but Amp-hours (Ah) and milliamp-hours (mAh) are the most common units for measuring battery capacity.
By dividing by the battery's nominal voltage (V), you can change Watt-hours into Amp-hours as follows: Ah = Wh / V
An amp-hour, also known as an ampere-hour, is a unit of charge that represents the flow of current over some time. A steady current flow of one amp for one hour equals one amp. A 1000 mAh battery would be equivalent to a 1 Ah battery since a milliamp-hour, also known as a milliampere-hour, is one-thousandth of an amp-hour.
The results are simply estimates; the real results will differ depending on the battery's age, condition, temperature, rate of discharge, and other variables. When utilising brand-new, high-quality cells at room temperature and the anticipated run period is between one hour and one year, the predicted results will most closely match the actual findings.
How do you calculate how long a battery will last under load?
Some gadgets divide the electrical load into the circuit load (power consumption while the product is not in use) and the active load (draw while in use). The active load may occasionally be divided if a product has numerous settings for variables like brightness or duration. These metrics are clearly defined, even though there may be a lot of data to analyse.
Many end customers, including some electronics engineers, are interested in knowing how long their batteries will last. To help you determine how long your battery will last, we have provided a straightforward battery time calculator.
Battery capacity in mAh/load current in mA equals battery run time.
Let's look at a concrete case For a 100mA current cell phone, a 2000mAh battery will last for 20 hours. Battery capacity (mAh)/Load Current equals battery life (mAh)
Important: Be careful when converting between mAh and Ah. For example, 500mAh/100mAh = 5 Hours if the battery has Wh information on it. 1Ah=1000mAh for a 500mAh battery that works at 0.1Ah device.
The formula applies to all volts, including rechargeable batteries of 12V.
For example, if a 12V 100Ah solar lithium battery is used to power a 12V 30A device, its run time would be calculated as 100Ah/30A=3.3Hours.
Here are a few really important takeaways.
1 You can apply the formula and omit the volt when converting a battery with the same volt, same Ah, or same mAh.
2 The challenging component of determining a device's usage to determine how long a battery will last is that it changes constantly.
3 Whether you're looking for a 12v battery pack run time calculator, a 24V calculator, or a 36V calculator, it didn't matter because our formula for determining the run times for each battery or gadget was the same.
How do you calculate how long a battery will last in a circuit?
The whole time a battery can maintain a specific power output is known as battery run time. This runtime will vary depending on several elements, such as the battery size, type, and discharge percentage.
Never again needing to charge a smartphone would be amazing. But you're undoubtedly painfully aware that batteries don't last forever. Based on the following algorithm, this battery life calculator determines the approximate runtime of your battery:
Battery life is equal to capacity/consumption (1 - Discharge safety),
where:
Your battery's capacity is expressed in ampere-hours. This figure is typically printed on your battery;
Consumption: Your electronic device's average current draw, measured in amps. (Don't forget to use Ohm's law calculator if you want to understand more about electric current)
Discharge efficiency: is the percentage of your battery's capacity that is never used. For instance, if you use a LiPo battery to power a drone, you should never discharge it below 20% as this could cause harm. Our battery life calculator uses a default discharge safety of 20%, but you are free to modify it as you see fit.
The Duration of a Battery in Sleep Mode
Imagine that you are creating an Internet of Things (IoT) gadget that is primarily in sleep mode. In this situation, you should probably determine how long a battery will survive. To learn more, simply launch the advanced mode.
You can modify the following extra parameters in the advanced mode:
The time that your gadget is awake during one operating cycle, such as two seconds, is known as the awake time.
The average consumption of your gadget while it is sleeping, expressed in amps, is called consumption in sleep mode. When compared to consumption while awake, this value is most likely substantially lower.
The amount of time your gadget sleeps during a single operation cycle is known as sleep time.
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