Welcome everyone. This battery was made at the time when IBM has already sold its laptop business to Lenovo, but the IBM brand was still printed on these products. It is from August, 2006, so it is almost 10 years old. I red this from the battery markings. The battery was used in a T60 laptop. Its teardown was a bit harder than the noname battery I have already written about, because the case is stuck together better.
So the brand is IBM, it is 10,8V and has a capacity of 7,8Ah. As it has 9 cells, it can be calculated that each cell has 2600mAh capacity in it. The cells are Panasonic made and their specification says they have 2550mAh capacity each. If we take it nine times, we get only 7,65Ah capacity, which is slightly smaller than the indicated number on the case.
It looks like this when I have ripped it open. It is interesting how the third row is split a bit. I think this is only a design solution, it has no real purpose. 3 cells in series and 3 in parallel. There is the controlling circuit on the top and there is the heat sensor duck taped to one of the cells. That's all. Well, I have not expected anything else. 6 of the cells had 3,65V voltage, 3 of them had only 2,65V. The guy, from whom I get the cells, told me, that after a charging the battery would not work anymore. We will see if the cells are still in working condition or not.
In the noname battery I previously opened had a nicer controlling circuit. That had a red circuit board and was not covered with such rubber material.
The microcontroller chip is an M37512 together with a 61048FP. If you are interested their specifications you can search on Google. The heat fuse can also be found on the board, it looks slightly different like on the noname circuit.
The temperature sensor can measure only the top right cell's temperature. Maybe it is put there on purpose? Maybe that cell is the mostly used.
This is what is left from the battery, I will use the temperature sensor for other projects.
Here is the capacity list of the cells:
| 1370 |
| 1317 |
| 1192 |
| 1362 |
| 1264 |
| 1062 |
| 1001 |
| 1187 |
| 1031 |
How to find out if the cells are in a good shape. For each cell:
1. Measure voltage, if it's less than 2.5v, do not use it.
2. If it gets hot during charging, do not use it.
3. After charging the voltage should be between 4.1v and 4.2v.
4. After 30 munutes if it's fallen less than 4v, do not use it. Note the measured voltage.
5. After 3 days, measure the voltage again, if voltage has fallen more than 0.1v from the recorded voltage, do not use it.
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