<b>Comes with: Portable Battery Charger and USB-C cable. (NOTE: No battery is included in the package.)</b><br><b>If you have any problem, please contact us, our team will respond within 12 hours and provide you with 100% quality service.</b><br><br><b>Tip for winter battery storage: Remove your batteries from the derailleur if you aren't intending on riding the bike during the winter; however, be aware that the batteries will not hold a full charge, so plug them in and recharge every couple of months.<br></b> <b>It is capable of wireless charging. If you don't have an adapter, prepare a 18500 Li-ion battery (not included in the package) and place it in the charger's battery compartment to charge your derailleur batteries.</b> <br> <br> <b>Charge times may differ depending on the USB power source.</b> Use a USB 3.0 or later charging port for the optimum charging performance. If you're using a USB AC adapter, ensure sure it has a minimum of <b>1A at 5V</b>.<br> <br> This battery charger features the LED indication.<br> <b>A flashing blue LED</b> indicates: the charger is receiving adequate power or that the power bank 18500 battery is charging.<br> <b>A solid blue LED</b> indicates: the 18500 battery is function (Need to insert a 18500 Rechargeable Li-ion battery into the battery compartment, press the power switch to charge for your SRAM battery.)<br> <b>The green LED </b>indicates charging is complete (Charge 1 battery), <b> Green LED off</b> indicates charging is complete (Charge 2 batteries.)<br> <b>The amber LED</b> indicates: the battery is charging.<br> <b>A red LED</b> indicates an error has occurred. Remove and reinstall the battery, disconnect and reconnect the charger plug, and if the LED is still red the battery or charger may be defective.