I've been refurbishing a used Lenovo laptop. It's still more than good enough to run Windows 11, but it is looking a little worn having been a former work machine. The main thing required to get it up and running is a new CMOS battery and to make it more serviceable, while I have the laptop open, I also replaced the main battery.
I bought a reasonably priced replacement battery for the CMOS, making sure it had the correct JST connector used on Lenovo laptops. However, when it arrived, I spotted that the pins on the plug were wired in reverse.
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| Wrong on the left |
It was a fairly easy job to release the pins from the socket and swap them over.
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| Corrected |
I used a needle to lift the plastic clips, being careful not to short between the two pins.
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| Before |
Job done, inserted in the laptop and all working.
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