This ECAM ELEC page indicates the batteries are:

The indication that the batteries are being charged is derived from the elements shown on the ECAM ELEC page. When the batteries are charging, the system typically displays information about the charging status, such as the current flow into the batteries and the associated charging circuit conditions. This is an important operational aspect, as it informs the flight crew about the health and status of the battery system, ensuring that sufficient power is being stored for use during critical phases of flight or in case of electrical failures.

In a well-functioning system, visual cues on the ECAM will indicate any active charging processes, highlighting that the batteries are receiving power from an external source or from the engines’ generators, depending on the aircraft's operation at that time. This feature assures crew members about the operational readiness of the batteries.

Other potential readings or indicators could suggest different statuses, like discharging, supplying power, or faults, but in this context, the presence of a charging indication clearly points to the active state of battery charging.