"Whr" is an invalid unit. The correct unit is "Wh" which is the SI unit of power multiplied by time, typically hours, but minutes and seconds are equally valid as in "Wattminutes" and "Wattseconds."
A simple answer is that a 53Wh battery will last half as long as a 106Wh battery. But what does that really mean?
To answer the question more fully, batteries are typically rated in Ah or Amphours which means a battery with a rating of 50 Amphours (like a typical car battery) can deliver 50 Amps for one hour, 10 Amps for 5 hours, etc. Note that this is strictly a current over time rating without regard to the battery voltage. However, Ah is NOT the amount of power a battery can supply.
Power = Amps x Volts = Watts. However, Watts are a RATE of power being supplied, not how much in total. To signify an AMOUNT of power, you need to add time. Thus, Watts x time = total amount of power, or more correctly, energy supplied.
So, taking your question of "What does 53Whr mean in terms of battery life for a new laptop?", we can answer that in terms of how long the battery charge will last because all batteries fundamentally suppy x amount of current for x amount of time regardless of what the battery voltage is. But we need to know the voltage in order to determine how much energy a battery can supply.
If we work backwards, and take 53Wh, we are starting with the total amount of energy the battery can supply. But that does not give any real idea as to HOW LONG the battery will run the computer.
To know how long the battery will last, we need to know just a few of several possible things: the battery's Amphour rating and the current drawn by the computer or, it's Wattage (Watts drawn) and the battery's Wh rating. The latter one you know. Or, it's voltage and Amphour ratings. From these we can convert back and forth to any other unit(s).
Since you only have the battery's Wh rating, to figure out the battery's Amphour rating, one must know the battery voltage because Watts = Amps x Volts.
There are multiple ways to approach this question depending on what units you are given but we can really only make an estimate as the amount of power modern computers use depends on what you are doing. Like is the backlight on high or low? Or, are you typing a note, or playing a high-power game, or watching a DVD etc. etc... .
The only way to mostly answer your question verbatim is to make some assumptions, get an answer, and show you how one calculates the run time. Then, you would have to use actual values to get a "real" answer.
Here are three paths leading to the same answer:
First, let's assume that, Battery rating = 53Wh, and Laptop nameplate power is 35 Watts.
We know the laptop will use anywhere from 35W to maybe 1W so we take the worst case of 35W.
Very simply, Wh = Watts x hours. Thus, hours = Wh ÷ Watts.
So 53Wh ÷ 35W = 1.51 hours or 91 minutes. That's the simplest way.
But, what if instead the laptop's label says 2.92 Amps @ 12 Volts?
In this case, we know the battery voltage, and the laptop's current comsumption, but we need to convert that into energy which is what the battery provides, and is what Watthours are.
Using Ohm's law (sorry if this is getting too technical), Amps x Volts = Watts.
Using our assumed numbers, 12 Volts x 2.92 Amps = 35W.
Appying the first scenario, the run time would then be the battery's 53Wh ÷ 35W = 1.51 hours, the same time we calculated above.
As long as you know the battery voltage, and either Watts consumed, or the current (Amps) drawn, you can convert into Wh and determine how long the battery should run.
Finally, a third way to get the same answer: Again, assuming the battery is 12 Volts, and is rated at 53Wh, we can say 53Wh ÷ 12V = 4.42 Amphours (Ah). Assuming the same current draw of the laptop of 2.92 Amps, we can calculate 4.42Ah ÷ 2.92Amps = 1.51 hours, again, the same time.
Interestingly, you asked about a "new" laptop. As the battery ages, it's Amphour and thus Watthour rating will slowly decline until it's energy capacity becomes low enough to become a pain in the butt. Then, it's time for a new battery!
Laptop battery life is measured in terms of the number of charging and discharging. And impacted by many factors, so if you preserve your battery well, you will get a good battery using life.
The Thinkpad T420 is one of the longest lasting laptops in terms of battery life. Sony Vaio S or Z can have an extended battery sheet (adding almost no thickness) that will make your laptop have ridiculously long battery life.
Although no one can predict battery life for a laptop, This Laptop has several features when used correctly, which will efficiently expand battery life.
This laptop has up to 4 hours and 15 minutes of battery life.
A usual laptop battery life for a new laptop would be 3-5 hours depending on screen size.
This laptop has a battery life of around 7 hours. This can differ with the type of applications you have going and the power options on your laptop.
The battery life of the Dell d800 laptop does not get very good reviews. The battery holds a charge of approximately 250 minutes worth of battery life.
it depends on what features your laptop has. research your laptop on google.com. cnet has good reviews which usually says battery life.
The expected battery life for this laptop is about 4 hours.
Its battery life is 3 to 4 hours.
About 4 hours is good for a laptop.
The battery life of Toshiba laptop is about 2 hours average for normal usage. When the laptop is in the power saving mode, the battery can live up to 3 or 4 hours extra.
A good travel laptop that has a long battery life is a Toshiba. I have one and the battery life on it is about 4 hours after a full charge on the battery.
The Sony Vaio laptop has a battery life of approximately 4 hours.
The estimated battery life for this Sony laptop is estimated at 2 hours.
Laptop batteries have a life expectancy of approximately 400-500 recharges, depending on the battery. To conserve battery power, simply decrease screen brightness and unplug the charger when the laptop is fully charged.
Old laptop batteries have the shortest lives.
The battery life for the Dell Inspiron Mini 9 provides over 4 hours of battery life.
The battery life is about four to five hours depending on the energy options of your choice.
depends on the how u maintain the laptop and don't charge the battery for hours to gether when ever it necessary keep the charge >
The biggest difference in laptop battery life comes from the size of the battery and with it the size of the laptop. The bigger the battery, the longer it will last. Manufacturers of laptops will always have to struggle with either a smaller laptop and smaller hardware (for example the battery) or a bigger laptop with better hardware.
This Laptop has a projected battery life of 6 hours and 15 minutes. Additional batteries can be purchased separately.
yes you can take it on the plane. in terms of power and battery life check your airlines website to see if power ports are available.
A laptop computer has a battery that has a wonderful battery life. As long as you charge your laptop battery for the appropriate amount of time, then you can use your laptop without the need to plug it in for many hours. This will allow you to be free and not be tied to finding an outlet to plug in your laptop.
The acer netbook claims to have 8 hours of battery life, which is far more then most laptops,
Asked By Wiki User
Asked By Wiki User
Asked By Wiki User
Asked By Wiki User