<b>Warning:</b><p>1. This Battery tester doesn’t contain battery, is only used for testing, charging, and re-activate iPhone batteries.<p> 2. This is the professional testing and re-active battery tester, not for one-time used, we suggest that DIY enthusiasts can resell it out.<p>Kaisi is a professional provider of precision tools. The products are widely used in communications equipment, intelligent mobile phone, tablet computer, walkie talkie, game machine, MINI PC, shaver, watches and other sophisticated electronic equipment. <p>Use Kaisi k-9201 to test, charge, and re-activate iPhone batteries that have gone dead due to a very low charge (below safety level). Compatible for iPhone 4G / 4S / 5G / 5S / 5C / 6G / 6P / 6S / 6S Plus / SE / 7 / 7 Plus.<p>Description: <br>The battery test charge/activation board brings old or dead iPhone batteries back to life. <br><br>Advanced design allows you to charge a maximum of two batteries at any one time. <br>2A Current Protection/cut off, if the current of voltage are too high the protection automatically disconnects the power supply. <br>Short circuit protection: If the battery has a short-circuit, the warning lamp will illuminate - Do not to charge the battery!<br>Visual display - A dual LCD display showing current & voltage. <br>Safe and easy to use - Attach battery and power to use, when the battery is full it will stop the output charge current to prevent overcharging. <br>Low voltage activation: os battery voltage is below 3V, the battery can be re-activated using the activation button. <br><br>More Info & Note<br><br>Keep the input voltage below 5V. <br>It's better to charge one battery at a time for a faster charge. <br>The left LCD display shows the current. <br>The right LCD display shows the voltage.