•【Universal Compatibility】 Supports up to 5A input/output charging and includes an automatic power cutoff mechanism when overload voltage is detected, making it compatible with a wide range of iPhone 5 to 16 Pro Max, ensuring broad applicability •【One-Click Quick Activation】 The board features a user-friendly activation button, allowing you to easily plug in the battery and activate it with just one click •【Automatic Anode/Cathode Recognition】 Built-in automatic recognition circuitry adjusts the output voltage and current according to the battery's polarity, ensuring safe and accurate charging regardless of how the battery is connected •【PD Fast Charging】 Equipped with a PD chip, this activation board supports Power Delivery fast charging, enabling quicker and more efficient charging for your device •【Overload Protection】 Designed with 4.2V regulated output and high voltage overload protection, it offers multiple layers of protection to safeguard mobile phone batteries from potential damage •【Automatic Power-Off Function】 Once the battery is fully charged, the board will automatically shut off and the red indicator light will turn off, ensuring energy efficiency and preventing overcharging Specifications: •Model: BST-J4 •Voltage: 4.2V~4.5V •Power interface: Type-C •Board Size: 17*1.5*105mm •N.W.: 6.0g Package included: •1 x Battery Activation Small Board