Nokia 5165 - Manual (Page 77)

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Charging moves to the rear slot once the front battery is
100% charged.
When the spare battery is charging, check the status indicator
on the left side of the charging stand. A red light indicates
that the battery is charging; a green light indicates that the
battery is charged to at least 80% of its capacity.
The 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
Front slot
empty
Front slot
occupied
Front slot
empty
Front slot
occupied
BPS-1 Ultra Slim
Li-Polymer 600 mAh 4 hours,
30 minutes
6 hours,
30 minutes
3 hours
4 hours,
30 minutes
BLS-2N Extended
Li-Ion 900 mAh
6 hours,
30 minutes
8 hours,
30 minutes
4 hours,
30 minutes
5 hours,
30 minutes
BMS-2S Extended
NiMH 900 mAh
BMS-2V Vibrating
NiMH 900 mAh
BLS-4 Ultra Extended
Li-Ion 1500 mAh
12 hours
15 hours,
45 minutes
8 hours
10 hours,
30 minutes