The Noise Of Laptop Battery

Recently, one friend came to ask for help on his laptop. the thing is: when he use his dell inspiron 6400 battery, the screen has certain noisy sound. That troubled him for a period. He doubted whether there was something wrong with the dell 6400 battery or the LCD screen. Due to his description, there are two situations.
First, when the inspiron 6400 battery in charge, because of the energy-saving features, the entire notebook circuit voltage is constantly changing. At the mean time, the current of the screen in the power coil ignition coil is constantly changing, too. For some laptop has weaker electromagnetic shielding ability, it's clear to hear the noise. It's known as the high-frequency noise. This is usually happens to the laptop AC adapter. Actually, this situation always happens to the lower quality laptops. As for the brand laptop, there is seldom this problem. For some users, they have found that the laptop AC adapter got the same problem and had noise while using. There is one more reason. That is the high- frequency noise. This noise is different from the first one. Some users have the feeling that it's really irritating to hear the noise. I believe that friends are listening to the sound. Generally speaking, the sound is caused by the motherboard design flaw. If this situation happens too common, the manufacturers will release updated BIOS to solve the problem. This is not new. Like IBM, HP, they have this problem before. And they have updated the BIOS to solve this defect. When you come across this situation next time, don't be panic. It's not the defect of the Dell inspiron 6400 laptop battery, neither of the laptop screens. You can call the service center for help and check recent news whether it's the manufactures' carelessness. This is not serious problem as you imagined, just put your heart in your stomach. If you do mind, you can defend your right under the warranty.

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source:  The noise of laptop battery

Laptop batteries are rated by, Voltage (V) and milliampere-hour (mAh). Voltage is the rate at which energy is extracted from the battery and represents milliampere / hour battery capacity. The milliamp hour rating corresponds to the runtime of the battery. A battery with a rating higher milliamp hours is a relatively long period of time of a battery with a rating lower milliamp hours.
Batteries with different milliampere-hours can be used in the laptop where the samerated voltage is the same. The voltage must match the original battery or as recommended by the computer manual. Using a battery with a different voltage setting can seriously damage your laptop. The power of most compatible / replacement batteries are the largest builders original batteries. This does not damage your laptop, in fact, it simply means that in many cases these batteries last longer, "the manufacturers original batteries. Askexperts