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Mah To Watts, The Difference Between Milliampere And Milliwatt-Hour

Mah To Watts, The Difference Between Milliampere And Milliwatt-Hour

December 05 , 2023 0

MAh And Watt-Hour Wh Calculation

Milliampere-hour (mAh)-- watt-hour (Wh) voltage V
The formula is W=qU
For example, 8Wh/3.7V = 2.162Ah=2162mAh
Unit conversion
Wh = 0.001 kWhW/U = 1 q
1Wh/1V=1Ah=1000mAh1000mAh*1V=1Wh

Basic Meaning OF Battery Unit Milliampere-Hour

The milliampere-hour (mAh) is the product of the current mA consumed by the appliance or output from the power supply and the number of hours h when the appliance or battery is in use
Originally, the larger the number, the longer the power supply can support the normal operation of the electrical appliance, or the greater the power consumption of the electrical appliance within a certain period of normal operation. The units larger than milliampere are A(ampere), kA, 1A=1000mA, 1kA=1000A, and the conversion between milliampere and ampere-hour is the same, 1Ah=1000mAh, 1kAh=1000Ah.
In practice, however, this is not entirely the case

Battery Capacity Calculation In Series And Parallel

According to the above definition, the same specification of batteries in series, the total milliampere or ampere hours is still equal to the milliampere or ampere hours of a single battery. Because the current energy output of each battery does not change when it is in series, it is similar to extending the road, the number of lanes is unchanged, the length of the road is increased, and you can go further. The total voltage after series is equal to the voltage of a single battery multiplied by the number of batteries. For example, five 3000mAh lithium batteries are connected in series, with a total capacity of 18V3000mA, not 18V15000mAh, and not a vague 15000mAh.

When the batteries of the same specification are connected in parallel, the total voltage is still equal to the voltage of a single battery, and the total milliampere or ampere-hour is equal to the single milliampere or ampere-hour multiplied by the number of batteries. Similar to widening the road, adding more lanes, so that the road can accommodate more cars to walk together, the length of the road remains the same. For example, five 3000mAh lithium batteries are connected in parallel, with a total capacity of 3.6V15000mA, not 18V15000mA, and not a vague 15000mAh.

Capacity Unit OF Ambiguity In Milliampere-Hours OR Ampere-Hours

However, the milliampere hour (mAh) only involves current and time, and the voltage is missing.

The speed at which electrical energy is consumed or output by the battery, generally expressed in W (watts), or kW (kilowatts). 1W is equal to the speed of the electrical appliance to do work at voltage 1V and current 1A, and it is also equivalent to the speed of 100V and 0.01A. When expressed as a battery, it is the speed of the output energy.

As long as the voltage and current product is the same, no matter how much the ratio of voltage to current size is, the speed of work, that is, the speed of energy consumption, that is, the power size, is the same, for example, 1V*1A=100V*0.01A=0.5V*2A=1W, 1 watt is also equal to 1 joule per second, 1W=1J/S, So the milliwatt, watt, or kilowatt is a unit of the magnitude of the speed at which work is done.

The total amount of electric energy consumed by electrical appliances in an hour is how many kilowatts, or the total amount of electric energy output in an hour of battery time is how many "degrees" we usually say, that is, the product of power and time. The units of current and time are mWh, Wh, or kWh. 1W=1V*1A*1h=1V*1000mA*1h=1000mW, corresponding conversion, 1kWh=1kW*1A*1h=1W*1000A*1h, etc., the product of the three is equal, the work done or the power output is equal.

For example, according to the above method, the capacity of the battery after series and parallel connection is 3.6v15000mah or 18V3000mAh, and the total capacity is 3.6 * 15000=18*3000=54000mAVh(milliwatt-hour)=54Wh(watt-hour). Battery series or parallel does not change the capacity used, just to get the right voltage or current, to meet the requirements of electrical appliances, which is in line with the basic principles of physics.

The problem comes, the battery capacity is marked mAh or Ah, but has nothing to do with voltage, whether the two batteries, mAh or Ah are the same, their ability to output energy must be the same?

Obviously not. For example, a car battery, 12V60Ah, and a lithium battery pack 3.6V60Ah, are all 60Ah, the ability to output energy, that is, the capacity, but very different. The former is 12*60/(3.6*60)=3.33 times of the latter, because the former voltage is 3.33 times of the latter.

Therefore, Wh or kWh is the accurate unit to identify the power supply capacity or load power consumption, mAh or Ah is not.

Obviously, after the battery is connected in series and parallel, the calculation of Wh or kWh is exactly the same as the calculation of the battery mAh or Ah above.