this post was submitted on 17 Mar 2026
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Lenovo USB-C PSU for laptops powers a Rasberry Pi, but cannot simply charge bicycle lights. WTF? (external-content.duckduckgo.com)
submitted 5 days ago by evenwicht@lemmy.sdf.org to c/askelectronics@discuss.tchncs.de
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I bought a 2nd-hand Lenovo USB-C PSU (ADLX65YLC3D) which indicates a range of voltages (20v, 15v, 9v, 5v) on the label. Tried to charge a few different bicycle lights but the charging indicators did not light up on any of them. I almost tossed it because the 2nd-hand market I bought from is definately dodgy. But then I tried to power a Rasberry Pi and it seems to work on that. So wtf? An a/c adapter either works or it doesn’t. What would cause this: works on some devices but not others? The Rasberry Pi needs 5v just as the bicycle lights. That is the default voltage for USB-c.

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[–] brillotti@lemmy.world 3 points 5 days ago

This is correct. I made my own USB C to 30 pin adaptors for old iPods and this is precisely how I had to build them.