Battery period of revolution computation
Battery period of revolution computation
Battery period of revolution computation
The capacity is refers to the discharging current and the discharge time product, said that strictly is the electric current to the time integral.
The popular point said that if the 4000mAh battery in the 1000mA electric current release electricity, can put for 4 hours.
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Therefore the battery in series, the capacity will not increase, but the energy will do.
Battery's energy is the capacity and the voltage product, bigger is better.
6 cell batteries are 2 parallel and 3 in series, therefore the voltage is 3.6*3=10.8 or 3.7*3=11.1V,8 cell batteries are 2 parallel and 4 in series, the voltage are 14.4 or 14.8V
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Actually these two algorithms are similar,the battery to the voltage means no electricity, let's calculate 3.6V for each section for the moment.Therefore, under the same capacity, the higher the battery voltage, the greater the energy, and the computer period of revolution is longer.The energy of 4400mAh with 6 cell batteries can store up: 10.8V*4.4Ah=47.52wh,8 cell batteries can store up: 14.8V*4.4Ah= 65.12wh.
Obviously 8 cell batteries can store energy much higher.
Here to say a point again, If 2 batteries in parallel, the capacity doubles, 2 batteries in series, the capacity is invariable.It may seem unreasonable, but think about the energy carefully then you will understand that was reasonable, because the parallel does not increase the voltage, but the establishing contacts voltage enhanced one time, therefore the product was equal.Those which determine battery life is energy (unit: wh watts) rather than capacity (unit: Ah or mAh).
Say a point again in detail : For instance computer's power was 20w (actually notebook also on this power.someone said it be 56w or 60w,that's impossible, because of 8 cell batteries also on 65wh energy, if power achieved 65w, means that battery only could use for 1 hour, at least I have not seen such a fast notebook power consumption), then under the normal work condition, 6 cell batteries need to provide about 20/10.8 = 1.85 electric currents, the battery period of revolution was: 4.4/1.85 = 2.4 hours, similarly, 8 cell batteries, the battery needs to provide the battery probably is 20/14.4= 1.4A, the battery period of revolution is: 4.4/1.4=3.14 hour.
Obviously, 8 cell batteries can use 188 minutes, 6 cell batteries can use 144 minutes, 8 cell batteries compared to 6 cell batteries more than 44/144=30%, just right with 8 more than 6 2/6.
Simply speaking, 8 cells compared to 6 cell more than 2 cells, according to the energy that extra 2 cell power supply, the time is definitely longer 1/3, just as car fuel, 8 liters oils can drive the distance definitely longer 30% than 6 liters oils.
The above computation simplifys many suppositions, for example, the battery in the use process, is not the constant pressure, generally falls from 4.2 to 3.2; In order to discuss convenient,so the supposition is a constant pressure, otherwise we must use the calculus to calculate.
As for the 6-cell and 8-cell adopt the same assumption, so both battery life and computing the ratio should be consistent.
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