Usage Tips: 7.4V SM4P Reverse Charger 4-pin Lithium Battery USB Reverse Charging Cable Walkbee Features: - - SM4P 400mA output current, 7.4V (3.7V x2) output voltage - Automatically adapts to USB input power, quickly and stably recharges the battery - USB charger with SM4P plug for Li-ion battery, compatible with RC toys, cars, boats, and other USB chargeable devices - Correct positive and negative connection must be ensured between the charger and battery - Built-in intelligent load identification chip prevents excessive current and voltage, protecting the device from damage Specifications: - Item: USB Li-ion Battery Charging Cable - Input: DC 5V - Output Voltage: 7.4V (3.7V x2) - Output Current: 400mA - Cable Length: Approximately 63mm (2.47 inches) Notes: - Before ordering, confirm the correct polarity of the battery plug - Allow 01 cm error due to manual measurement; ensure you are comfortable with this before purchasing - Due to differences in monitor displays, the actual color may vary slightly from the image Package Includes: 1 x Battery Charger