dell laptop battery

The Li-ion battery in my IBM Thinkpad X31 laptop has always been a bit on in years. Designed for a 4.4 AH capacity new / proc/acpi/battery/BAT0/info told me that it holds only 1.8 Ah now, that it was a few years old. (This is for Li-ion batteries, which are degraded over time, normally without multiple charge-discharge cycles.)

A new Dell Inspiron 1545 battery costs more than a hundred dollars, but by comparison I could find a "compatible" battery for less than $ 50. It was only rated at 4.4 Ah, but that is relative to the second Generation 4.8Ah batteries, IBM / Lenovo to sell twice as much to close. I began to wonder whether it might be cheaper buying OEM Li-Ion cells and simply replace the cells (where the case, and charge / discharge electronics). The first step would be to determine what type of Li-ion cells, which I'd need to buy, so I decided to open my old battery.

As you can see, the standard DELL Studio 1537 battery has six cells in three parallel groups of 2 The cells are nominally 3.6volts, so it comes on 3 x 3.6 or 10.8 volts. In the photo I've wrapped the package are removed from a cell to see the marks. Note the relatively complex PCB along the back of the cells, which is responsible for loading and unloading. If you zoom into the photo you can see that the controller PCB at each end of each pair of cells (orange and black wires at the ends, silver metal tab links to the two middle) is connected. This allows the controller to calculate each parallel pair of cells at different speeds. The controller PCB is also a thermocouple that lie between the two middle cells is connected. This gives the controller a temperature measurement on the cells during charging and discharging. If the PCB recognizes that the temperature is too high, they can lower the charge rate, or take the power consumption (and laptop). Note also the thermal fuse (small white block in series with the power line between the two leftmost cells) that are designed to open the circuit when the charging / discharging controller fails for any reason, a safe temperature must be kept. All these measures are designed to keep your DELL Latitude D620 battery from the ignition, and will be very important for everyone in "restored" to keep batteries.

I really determines what kind of Li-ion cells by measuring and then they were used to search for li-ion cells with a similar size. They are about 2.5 "high 11/16" diameter, or 64.9mm x 18.3m in the whole diameter size of a 18650-style cell, which I found to be close to laptopbatteriesinc.com.au.

My Dell Latitude D600 Battery is rated at 4.4 Ah or 4400mAh. Since there are three groups of cells in parallel is, each set of two cells must have a capacity of 4400mAh (because they are connected in series, add the voltage, not current), so that each cell has a 2200mAh capacity.

From one perspective, laptopbatteriesinc.com.au mAH per dollar's 2000mAH cells, the best value, but I decided that, since the total cost difference was only six dollars, I could afford to purchase the 2200mAh cells. These are slightly lower than the 2400 mAh capacity newcells that IBM / Lenovo now, and I'll end up with a 4.4 Ah DELL Latitude D830 Battery (just like the original part number, before IBM / Lenovo, it expanded to 4.8Ah).

Only the cells cost $ 34.20, but I chose to buy it with solder tabs attached (an additional $ 1.50), because I have the folks at laptopbatteriesinc.com.au a great number of mounting tabs, plus additional tabs, to work with (those who come to the cells, plus the ones I save from the original cells) will facilitate my life. (Also, the $ 7 for shipping the largest additional cost .... If not, the 2600mAh cells were almost twice as expensive as the 2200mAh cells I would have given it just a 5.2AH battery capacity!) The total cost amounted to $ 43 , 42 A week later my batteries arrived.