Main Features:<br />1. Input voltage: 4.7 - 24V (when the input voltage exceeds 12V， output current of 2A when requested to enhance heat dissipation ).<br />2. Charging voltage: 4.2V.<br />3. Charge voltage accuracy: +/-1 percent. <br />4. Charging current: 2A.<br />5. Charging current accuracy: +/-5 percent.<br />6. Charging: Blue LED light on， fully charged: blue LED off， (recommended to charge for more than one hour when blue LED is shimmering， for a more full battery).<br />7. Conversion efficiency: The highest 90 percent (5V input)， at 12V input efficiency is about 85 percent， at 24V input efficiency is about 80 percent. <br />8. Switching frequency: 500kHz. <br />9. Input voltage undervoltage protection: 4.2V (TYP).<br />10. Battery intrusion current: 10uA (without battery polarity protection).<br /><br />    Specifications<br />Weight and Size<br />  Product Weight: 10 g                                                  <br />                        Package Weight: 0.050 kg                                                  <br />                        Product Size(L x W x H): 3 x 1.8 x 0.9 cm / 1.18 x 0.71 x 0.35 inches                                                  <br />                        Package Size(L x W x H): 8 x 6 x 1.2 cm / 3.14 x 2.36 x 0.47 inches                                                 <br />Package Contents<br />  Package Contents: 1 x LTC4002 DIY 3A Lithium Battery Charging Module                                                 <br /><br /><br /><br />                                                <br />