Should I disconnect battery when my laptop is AC powered? That depends.

You may heard many times that it is advisable to disconnect DELL J70W7 battery when your laptop is AC powered because it protects the battery from high voltage (But this is true only if you disconnect the battery well before the battery is fully charged. If you disconnect after the battery is fully charged, you cannot get this benefit), and it protects the battery from the heat generated by the laptop.Yes this sounds reasonable.

Although these are true, disconnecting DELL XPS 14 Series battery may not be necessary for many cases and can even cause problems. You may didn't realize that many laptop vendors provide utility programs that control the charge level. This will eliminate the problem. In addition, batteries are often located at the cool part of the laptop such as the backside (near the LCD panel hinges) of the laptop. In these designs, battery temperature usually stays below 35℃ with normal use. If your laptop is designed this way, the problem does not affect the life span of your battery.

On the other hand, many laptops are designed to limit its performance (limit the maximum CPU clock frequency) when the battery is disconnected. This is because the AC adapter alone may not be able to sustain the power needed by the laptop at its maximum performance state.

Some laptop lower the CPU clock only when its AC adapter cannot sustain the needed power, but some other laptop apply much more conservative policy and limit the CPU frequency to very low level while the laptop is powered by AC only.

If your laptop behaves this way, you may not want to disconnect battery so that you can get full performance of your laptop.

Source from Internet.