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The original was posted on /r/askelectronics by /u/Mizo_Soup on 2023-08-07 15:53:11+00:00.

Hi, I’m simply looking for a simple circuit to charge a single lithium battery. I believe it’s 3.7v 18650. I would prefer using a transistor rather than an IC and maybe with a couple of LED’s as a charge indicator. Thanks!