Got a project that needs to charge a single lithium battery? These little TP4056 boards are super handy! You get 15 of them in this pack, which is great if you're building a few things or just want some spares. They take a standard 5V input from a Micro USB cable (like an old phone charger) and safely charge your battery up to 4.2V. They have built-in protection against overcharge and short circuits. The red LED lights up when it's charging, and turns green when it's full – simple. A few important notes: make sure your power source can supply at least 1A, and be super careful not to connect the battery backwards (it'll fry the chip). Sometimes you need to plug in the USB power first to 'wake it up' if it's a new board. Perfect for DIY electronics, hobbyists, or fixing up small devices. Get charging!
