DIY IBM Thinkpad 380E battery
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DIY li-ion battery for old IBM Thinkpad laptop
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- GNU General Public License v3.0
I have on old IBM Thinkpad laptop with missing battery. So, I decided to design my own DIY battery for it.
I didn't have an original battery so all the information I gather from the Internet and measuring the place for the battery in the laptop.
I found a pinout digram in the service manual:
From this information we can see that this battery is not a smart-battery. It does not communicate with the laptop. In addition to + and - it has a thermistor connection.
To build this battery the following items are needed:
18650 li-ion cells, 6pcs
3S 10A BMS board
PCB straight female pin header connector
10K NTC thermistor
some wires
The battery has 3s2p configuration. To connect the cells I used a spot welder and a nickel strip, but soldering with caution is also an option.
For connection terminals I used the metallic pieces of a regular pin header. I just pulled out of its plastic part and placed in the 3d printed case. See the included video for details.
I printed mine with ABS plastic. Some other plastics might require dimensions tweaking.
This DIY battery pack works without issues with the laptop.