Battery monitor module (Patreon)

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I've seen these on eBay in various forms and decided to get one to reverse engineer. Rather pleasingly, they have used standard components to make the device, so it does offer a level of hackability for custom voltage threshold measurements. In hindsight I wish I'd got a version for higher voltage use, as the single cell version dims the display noticeable over the discharge levels. That could be a good thing for a continuously active display though. I've not worked out what the mysterious indicator LED position is for. A quick search didn't reveal a version that used it. I've just ordered a different version that uses what appears to be a microcontroller to do the job, with a selectable voltage scaler for multiple lithium battery size options. I despise intrusive mid-video video-adverts, so despite being able to earn more advertising revenue by using them, I choose not to. If you appreciate that and enjoy my content then you can help support the channel with a contribution of a dollar or two a month on Patreon. That also lets you critique the (advert free) videos before they are released, gives a more direct means of communication with me and also gives access to the regular relaxed Patreon live streams. https://www.patreon.com/bigclive #ElectronicsCreators