It is difficult to determine the run time of new laptop battery. The life time of the battery depends on how much power the components of the laptop demand. The parts that drain extra battery, and reduce the run time of new laptop battery, are the hard drive, the monitor and a few other accessories. The other factors that affect the life time, or the run time, of your new laptop battery include the design of the laptop, and the number of hardware that is plugged into your laptop, through its USB ports.
Usually a new laptop battery runs at least as long as your old battery did, when you bought it for the first time. And at times, this battery may run even longer. Small electronic devices, laptops and note books use lighter batteries, and they are defined by the volts, amperes or mill amperes. Did you know that 1 ampere is equal to 1000 milli-amperes? Well, that is just some added information. In order to be able to figure out the life time or the run time of your new laptop battery, you will have to multiply the volts and the amps.
People determine it in such a way that higher the volts, the more your watt hours, but this can vary as it still depends on the amps. To find out the watt hour usage of your new laptop battery, all you have to do is look for it in the user manual of your laptop. There you will be able to find all the specifications of your laptop. A lot of people do not like to read their manuals thinking that they do know everything there is, to know about their laptop. But there are important things that you may not know, which you may end up doing, and in turn, it will shorten the life of your new laptop battery or the life of your laptop itself. It's better to be safe than sorry.
The more programs or peripherals you add in your laptop, the slower the run time becomes. The other harmless things that reduce your battery life are the games, the Wi-Fi and the video streaming. The watt hour that comes on your laptop does not include all these things.