75The phone has the built-in intelligence to maintain the battery, so there is no need for a discharge feature on the stand.
DCH-9 Rear Slot Charging Times
Battery
Using ACP-7U Using ACP-9U
Back slot
only
Both slots
full
Back slot
only
Both slots
full
BLS-2N Extended
Li-Ion 900 mAh
6 hours,
30 minutes
9 hours,
45 minutes 4 hours 6 hours,
15 minutes
BMS-2S Extended
NiMH 900 mAh
BMS-2V Vibrating
NiMH 900 mAh
BLS-4 Ultra Extended
Li-Ion 1500 mAh 12 hours 18 hours 8 hours 12 hours

BPS-1 Ultra Slim

Li-Polymer

600 mAh

4 hours,
30 minutes
6 hours,
30 minutes 3 hours 4 hours,
30 minutes