How should I use the MN Model MN333(S) 7.4V SM3P USB Charger E0-26 correctly?

MN Model MN333(S) RC Car Parts 7.4V USB Charger E0-26

Make sure the battery connector matches before charging. Use a stable USB power source and disconnect the charger after charging is complete.

matches before charging. Use a stable USB power source and disconnect the charger after charging is complete.