I do not recommend charging your batteries at home, especially inside a cool AC and if you take the batteries outside where it's hot, the heat will cause the voltage to spike and your batteries will be damaged.
Be sure to charge your batteries as close to when they will be used as possible by minimizing the amount of time they are fully charged.
A quality charger like an X6 or S6 will charge all 3 packs in parallel within 10-15 minutes @ 20A, more info here: