3.7V Li-Ion Battery Charging and DC-DC Step Up Booster Module | Micro USB Input | Adjustable 4.2V–27V Output | TP4056 MT3608

�� Dual Functionality:Works as both a 3.7V Li-ion battery charger and a DC-DC step-up booster. ⚡ Wide Input Range:Accepts input voltage from 4.5V to 8V DC (via Micro USB or IN / IN− pins). �� Adjustable Output Voltage:Provides 4.2V to 27V DC output, adjustable through the onboard potentiometer. ��️ Safe & Reliable Charging:Equipped with TP4056 chip for precise charging control and overcharge protection. �� High Efficiency Boost Converter:MT3608-based step-up circuit offers stable output and excellent energy conversion. �� Compact & Easy to Use:Small 3.3×2.3 cm size—ideal for DIY kits, prototyping, and portable devices. �� Solar Compatible:Can be powered directly from 5V solar panels for outdoor or off-grid setups. �� Multiple Applications:Perfect for powering Wi-Fi routers, LED lights, fans, audio amps, RC projects, and more.