If the PCB detects that the temperature is too high, it can lower the charging rate, or shut down the power draw (and laptop).
![accplus cracked accplus cracked](http://redledhoney.weebly.com/uploads/1/2/3/8/123897216/767241615.jpg)
This gives the controller a temperature reading on the cells during charging and discharging. The controller PCB is also connected to a thermocouple that is resting between the two middle cells. This allows the controller to charge each parallel pair of cells at a different rate. If you zoom into the photo, you can see that the controller PCB is connected to each end of every pair of cells (orange and black wires to the far ends, silver metal tab connections to the middle two). Note the relatively complicated PCB along the back side of the cells that handles charging and discharging. In the photo I have removed the shrink wrapped packaging from one cell to view the markings. Cells are nominally 3.6volts, so this adds up to 3 x 3.6 or 10.8 volts. The first step would be to determine what type of Li-Ion cells I'd need to buy, so I decided to open up my old battery.Īs you can see, the standard X31 battery has six cells, in three parallel groups of 2. I started to wonder if it might be cheaper to buy OEM li-ion cells and simply replace the cells (keeping the case, and charge/discharge electronics).
![accplus cracked accplus cracked](http://4.bp.blogspot.com/-g0olC9jakw4/UEvxI2_zHnI/AAAAAAAAADM/R-MBsLmupg4/s1600/Layout+Create+Radio.fw.png)
It was only rated at 4.4AH, but that is relatively close to the 2nd generation 4.8AH batteries that IBM/Lenovo sell for twice as much. (This is normal for Li-Ion batteries, which degrade over time, even without multiple charge-discharge cycles.)Ī brand new IBM (or Lenovo now) battery costs over a hundred dollars, but by shopping around I was able to find a "compatible" battery for as low as $50.
![accplus cracked accplus cracked](https://i1.wp.com/fullfreecracked.com/wp-content/uploads/2018/07/SAM-Broadcaster-PRO-2018.6-Keygen-With-Crack-Download4.jpg)
Rated at a 4.4 AH capacity new, /proc/acpi/battery/BAT0/info told me that it was only holding 1.8 AH now that it was a few years old. The Li-Ion battery in my IBM Thinkpad X31 laptop has been getting a bit long in the tooth.