Quick electronics capacitor demonstration with voltage measurements. youtube.com/c/electronzap https://www.amazon.com/shop/electronzapdotcom for links to where I bought most of the things I use in my videos. Electronzap earns money from this storefront. https://www.patreon.com/electronzap If you'd like to support my efforts directly. #electronics #741 #opamp ... https://www.youtube.com/watch?v=ksbGMHqB_Xk

I can't find my battery charger. So I am using the fan and other ways to test out the batteries until I find it or get a new charger. The 5V coming in had to be Stepped down to 4.2V which may mean there was slightly higher current filling the batteries. But, there is also some power loss by the charging circuit so I suspect it about equalizes. Li ion batteries should never be discharged below 2.5V or used if they ever have been below 2.5V. They should never be charged above 4.2V. Likely damaged if they are ever charged to 4.3V. Never charge a frozen li ion battery. Check how much current they can handle also and do not exceed that. Make sure to learn as much as you can about li ion batteries before you use them. Read the seller's specifications for the batteries and read the reviews to see if there are complaints about the seller's accuracy of specifications of anything you buy. There are many fake li ion batteries and sellers that lie about the specifications of the li ion batteries they sell. These EBL 18650 batteries cost about $3.50 each on Amazon. https://www.amazon.com/shop/electronzapdotcom for links to where I bought most of the things I use in my videos. Electronzap earns money from this storefront. https://www.patreon.com/electronzap If you'd like to support my efforts directly ... https://www.youtube.com/watch?v=mRSSoeS2WBo