Most current laptop computers, generally speaking, have an excellent protection function for the FRU 92P1104-2 IBM/Lenovo Thinkpad 65W ultraportable charger. This protection function is aimed at helping disenable the battery to be damaged from its ordinary operation, but the battery may still risk being damaged from the running out of its lifespan and other special causes. For such batteries that must have a little memory effect, their discharging time, if they are not properly used, will become shorter and shorter and make them even unable to be recharged.
This FRU 92P1104-2 IBM/Lenovo Thinkpad 65W ultraportable charger is first rapidly charged by way of constant current, and then slowly charged by means of constant voltage after its voltage reaches a certain value. It is often the case that most laptop computers have no strict monitoring devices for battery charging by virtue of constant current. The charging current will become smaller as the loading of the system is bigger, and vice versa. Such charging current of the battery is usually determined by the rest electric power of the AC electric adapter.
It is therefore obvious that when the FRU 92P1104-2 IBM/Lenovo Thinkpad 65W ultraportable charger, along with the laptop system, is being charged, there will be an internal contention between the battery and other components of the laptop, such as CPU, hard disks, LCD and others. The discharge of this battery means discharging it by small electric current, and its operation is to first let the CPU decrease its speed, allow the hard disk to stop running, and turn the screen darkest (or close the screen), and then do not run any programs until the laptop computer turns off. The reason for laying emphasis on discharging the battery by small electric current is due to a prevention of the laptop computer from examination of the insufficient voltage of the battery too early.