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Use ICAllIn’s Battery Life Calculator to estimate how long your device can operate based on battery capacity and average current consumption. By entering the nominal battery capacity and the load’s average current draw, the calculator predicts the expected battery runtime. Battery capacity is typically measured in amp-hours (Ah) or milliamp-hours (mAh), while watt-hours (Wh) may also be used in some applications. This tool provides a quick and practical way to evaluate battery performance for electronic devices and power-consumption planning.
Battery Life = Battery Capacity in mAh / Load Current in mA
* This is an estimated output, based on ideal conditions.
Introduction
Battery life refers to the duration a device can operate before its battery requires recharging. Calculating this effectively requires understanding the relationship between capacity, consumption, and efficiency factors.
Before using the calculator, it is helpful to understand the units involved:
While no battery lasts forever, you can estimate the approximate runtime using this standard formula:
Where:
Calculated results are estimates. Real-world performance depends on several variables:
The following table provides estimated capacities for common battery types to help you estimate if you don't have the exact data sheet.
| Battery Size | Chemistry | Estimated Capacity (mAh) | Notes |
|---|---|---|---|
| AAA | Alkaline | 1200 | Standard remote batteries |
| NiMH | 800 – 1000 | Rechargeable | |
| AA | Alkaline | 2700 | Standard household use |
| Lithium (Rechargeable) | 3000 | High drain devices | |
| NiMH | 1700 – 2900 | ||
| C | Alkaline | 8000 | Medium drain |
| NiMH | 4500 – 6000 | ||
| D | Alkaline | 12000 | High capacity flashlights |
| NiMH | 2200 – 12000 | Wide variance in quality | |
| Lithium-Primary (3.6V) | 19000 | Industrial use | |
| 9V (PP3) | Alkaline | 565 | Smoke detectors |
| Lithium-Primary | 1200 | Long-life applications | |
| NiMH | 175 – 300 | ||
| 6V Lantern | Alkaline | 26000 | Heavy duty lighting |
| Lithium-Primary (3V) |
| 240 |
| Coin cell (BIOS, watches) |
| CR2016 | Lithium-Primary (3V) | 90 | Thinner coin cell |
| 1/10 D | Lithium-Primary (3.6V) | 1000 | Specialized industrial |
| 4 Farad Cap | Capacitor | ~1 mAh | Equivalent @ 1mA drain/1V drop |
To determine how long your battery will last, calculate the battery's total capacity and divide it by your circuit's power. Multiply the battery's reserve capacity by 60. With a reserve capacity, for instance, of 120: 120 x 60 = 7,200.
How many hours does 5000mAh last? For 5,000 mAh generally means you can expect to get 100 mA for about 50 hours usage, or 10 mA for 500 hours, or 1 mA for 5,000 hours.
A 4,000mAh battery on a smartphone will ensure the phone should last well over a day depending on how heavily you use it. Here too, it's important to have fast charging not because not only could you need it in emergencies, but a 4,000mAh battery without fast charging will take ages to charge to full capacity.
mAh means milliamp Hour and is a unit that measures (electric) power over time. It is commonly used to measure the energy capacity of a battery. In general, the more mAh and the longer the battery capacity or battery life. A higher number means that the battery can store more energy, so it has a higher capacity.
It DOES have to be carried on, it CANNOT be checked under the plane.
Let your screen turn off sooner. Reduce screen brightness. Set the brightness to change automatically. Turn off keyboard sounds or vibrations. Restrict apps with high battery use. Turn on adaptive battery or battery optimization. Delete unused accounts.
The Best Thing to Do: Plug it in when the phone is between 30-40%. Phones will get to 80% quickly if you're doing a fast charge. Pull the plug at 80-90%, as going to full 100% when using a high-voltage charger can put some strain on the battery. Keep the phone battery charge between 30-80% to increase its lifespan.
With a 20,000mAh power bank (actual capacity: 13,300mAh), you can charge tablets and laptops about 1.5 times.
There is no danger in using your phone while it's charging. Charging tip: While you can use it during a charge, having the screen on or apps refreshing in the background uses power, so it will charge at half the speed. If you want your phone to charge more quickly, put it in airplane mode or turn it off.
about 71 hours It is about 71 hours. If you're talking about a power bank with a conversion and charging process, the efficiency is about 60 percent. The phone's battery is likely to be more than 3000mAh.
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