Do you really know how to properly use the battery of the HP A2304XL laptop?

So how much do you know about laptop batteries? Which unit should I use to compare the battery capacity of different laptops? What bad habits do you have when using your laptop?

We know that the battery has several important parameters, the operating voltage (V), milliampere-hour (mAh), and the watt-hour (Wh) we commonly see on the HP A2304XL laptop battery. Usually when we compare the battery capacity, we often use milliampere-hours (mAh) as the unit of comparison size. For example, when we were young, we used a four-wheel drive rechargeable battery, a battery inside the mobile phone, and a mobile power battery.

So what exactly does Wah (Wh) have to do with mAh? Let’s review the definition formula of the current in the physics class: from I=Q/t, we know that Q=It, if the unit of current I is mA (milliampere), t represents time, and the unit is hour (hour), mAh stands for The amount of charge in the battery. That is to say, if a battery capacity is 1000mAh, then when the current is 100mA, it can theoretically be used for 10 hours.

However, the voltage is not involved in the formula Q=It, so the mAh can only indicate how many Coulombs of charge the battery can hold. It does not indicate how much work the battery can do and what the maximum power the battery can provide. The above also said that the operating voltage of different batteries may be different, so there will be a number in watt hours (Wh) next to the milliampere (mAh) on some batteries.

Let’s review the definition of work done in physics class: W=UIt=UQ, the unit of voltage U multiplied by current I is W (watt), so how much work can be done is expressed in Wh (watt-hour). For example, the HP A2304XL’s built-in battery is 74.9Wh=11.42*6559mAh/1000. Therefore, we can calculate the operating voltage and milliampere time on the battery without wattage.

For example, in the following figure, the mobile power supply with a capacity of up to 12000 mAh, according to our customary comparison method, its capacity is much higher than Apple’s 6559 mAh. However, it was found by conversion that 5V*12000mAh/1000=60Wh is actually smaller than the built-in battery capacity of Apple RMBP13.

Summary: allbatteryshop.co.uk It is feasible to use the milliampere-hour (mAh) to compare the capacity of the same battery in the same voltage, but if you compare the battery of two different products, their working voltage is different, you must use Watson (Wh) is the unit comparison. If there is no watt hour (Wh) on the battery, the watt hour (Wh) can be converted by multiplying the mAh by the operating voltage (V) and dividing by 1000.