Casio V-T500-E Hardware Manual page 28

Table 2.4 Recharge Specification
Recharging method
LAN/USB Cradle (HA-M62IO)
Cradle-type Charger (HA-M30CHG)
Conditions for start of
recharge
Accessories in the left column
are attached to the terminal.
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Behavior after completion of
recharge
Recharge will automatically start
when the battery voltage made
lower than certain level.