Laptop batteries are complicated pieces of equipment. They are somewhat redundant as well. There's a 'smart circuit' in the laptop battery pack that monitors the conditions of the battery cells, however, it does not do what a lot of people say it does.
The image below is a typical smart circuit. It has four wires running out of it: ground, power, and two 'intermediary power' wires (actually the ground wire is just the tab on the right).
Lithium cells output about 3.7 volts. Like all batteries, in order to increase voltage, they are connected in series. However, charging a "pack" by adding power through the positive node and negative node of the whole Hp pavilion zd7000 battery pack is dangerous. They are not guaranteed to charge evenly (refer to resistance in series in a physics text). This means one cell may overcharge and explode, which is very bad especially since it's lithium. The intermediatary power wires are sandwhiched between every series connection of the battery pack so that it monitors each individual cell.
Now on to the nitty gritty. Most people would say not to mess around with the smart circuit, and they are correct. But if handled correctly, it won't be a problem. The core of the smart circuit does not control the charging cutoff and output cutoff when the gauge goes to 100% or 0% (older model laptops do, but not anymore). The smart circuit merely lets the enduser (laptop user) know how long they have before the ibm thinkpad r40 laptop battery runs out and let them turn on special options such as hibernation in order to save their work. Charging and discharging cutoff is done by a secondary monitoring circuit that monitors a one of two states called "end voltage" or "end amperage". So for those who believe that they must charge and discharge their batteries once a month or so to "recalibrate" the battery are wrong; it only recalibrates the gauge, not the actual capacity of the Toshiba PA3331U-1BRS battery. That is, if one is missing about 20% of their battery capacity due to the gauge being offsetted, the only reason why one would need to recalibrate is because they want to utilize the hibernation/shut off option when the capacity reaches too low. If one were to turn that option off, one can use the battery pack until it drains fully, completely ignoring the fact that the battery meter is flashing 0% (Because the meter does not control the battery's cutoff point, just the computer's). However, if the li-ion cell is dead/dying, no number of charge and discharge cycles can bring the battery back to life; the cell is physically dead (so forget about the term 'digital memory loss').
The image below is a typical smart circuit. It has four wires running out of it: ground, power, and two 'intermediary power' wires (actually the ground wire is just the tab on the right).
Lithium cells output about 3.7 volts. Like all batteries, in order to increase voltage, they are connected in series. However, charging a "pack" by adding power through the positive node and negative node of the whole Hp pavilion zd7000 battery pack is dangerous. They are not guaranteed to charge evenly (refer to resistance in series in a physics text). This means one cell may overcharge and explode, which is very bad especially since it's lithium. The intermediatary power wires are sandwhiched between every series connection of the battery pack so that it monitors each individual cell.
Now on to the nitty gritty. Most people would say not to mess around with the smart circuit, and they are correct. But if handled correctly, it won't be a problem. The core of the smart circuit does not control the charging cutoff and output cutoff when the gauge goes to 100% or 0% (older model laptops do, but not anymore). The smart circuit merely lets the enduser (laptop user) know how long they have before the ibm thinkpad r40 laptop battery runs out and let them turn on special options such as hibernation in order to save their work. Charging and discharging cutoff is done by a secondary monitoring circuit that monitors a one of two states called "end voltage" or "end amperage". So for those who believe that they must charge and discharge their batteries once a month or so to "recalibrate" the battery are wrong; it only recalibrates the gauge, not the actual capacity of the Toshiba PA3331U-1BRS battery. That is, if one is missing about 20% of their battery capacity due to the gauge being offsetted, the only reason why one would need to recalibrate is because they want to utilize the hibernation/shut off option when the capacity reaches too low. If one were to turn that option off, one can use the battery pack until it drains fully, completely ignoring the fact that the battery meter is flashing 0% (Because the meter does not control the battery's cutoff point, just the computer's). However, if the li-ion cell is dead/dying, no number of charge and discharge cycles can bring the battery back to life; the cell is physically dead (so forget about the term 'digital memory loss').
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