1. Check the battery power 2. Up to 3 batteries can be put in and in order from high to low power. Batteries with high power are first (not at the same time). 3. Storage mode: Press and hold the button for 2 seconds in charging mode to switch to storage mode. The best power for long-term storage of drones is 60%. Storage mode can charge batteries with power below 60% to 60% and then stop automatically. Done is displayed after storage is completed (only batteries with power below 60% can be stored and . The storage function cannot be used when the power is 60%) 4. Support PD fast charging Input; 5V/9V/12V/15V/20V-3A Output: 17.6V/3.8A (65W max) Net weight: 135G Product size: 18x5.5x3CM Colour:grey Material:plastic Package Contents: 1 * Charging Manager Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.