1. Pull out the battery from the charging butler, turn off and wait for 1 minute, confirm that the battery is in dormant mode, then insert the direct charging charger to charge for 3-5 minutes to wake up. 2. If still unable to recover, install the battery on the aircraft, keep the battery on for at least 1 minute on the aircraft, and then the battery is turned off. 3. Remove the battery, leave it for 1-3 minutes, and then insert it into the direct charge charger for recovery. 4. Then insert the battery into the aircraft and turn it on to see if the battery is back to normal.