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WARNING: THESE BATTERIES CAN BE DANGEROUS, SO WHEN CHARGING YOUR BATTERIES YOU NEED TO MONITOR THE VOLTAGE (NEVER LET IT GO BEYOND 4.3v) AND THE TEMPERATURE DURING THE PROCESS. THE BATTERIES SHOULD NOT HEAT UP, IF THIS OCCURS, STOP CHARGING! NEVER LEAVE YOUR BATTERIES CHARGING UNSUPERVISED! This charging process works perfectly and is not dangerous, as long as you take the necessary precautions. I have been charging my batteries this way for years, without any problems. But note in the comments that some people are very afraid of these batteries. Therefore, you need to be careful! In this video I show how I usually control the charge of my laptop scrap batteries. 3.7v Lithium batteries can be charged up to 4.2v. Alkaline batteries can be charged up to 2.4v.