Casio V-T500 Series User Manual page 120

1 Dual Battery
Charger Connection
Port
2 Charge Indicator
Lamp
3 Power Contacts
4 AC Adaptor Jack
5 Connecting Bracket
Attachment Holes
E-118
Use this port to connect multiple Dual Battery Chargers to each
other.
This lamp indicates the charge status of the battery pack(s).
Off: Not charging
Orange: Charging
Red: Battery pack problem or standby due to the surrounding
temperature being beyond the specifi ed temperature range
(Approximately 0°- 40°C) (charging resumes when the
temperature reaches the range.)
Green: Charging complete
Power is supplied to the battery packs via these contacts.
This is used to supply power by connecting the AC adaptor (sold
separately).
The connecting bracket attaches here when you connect multiple
Dual Battery Chargers to each other.