TP4056-based modules are the cheapest single-cell lithium battery charger available on the market. Commonly sold in packs of 10 on Amazon, e-Bay, AliExpress and other online retailers, they are a classic buy for most DIY electronics hobbyists when first trying to work with a lithium-battery in their project. But they’re just that: chargers. In most cases, hobbyists drastically overestimate their utility and then end up in a potentially dangerous situation, and lithium batteries can easily catch fire if abused. At PN Labs, we have extensive experience working with lithium batteries and care about people using them correctly, so we’ve
