Nortel Networks C4030 - Manual (Page 7)

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Battery Life
(with fully charged batteries)
Talking time: up to 16 hours
Standby time: up to 10 days
Battery discharging
Maintain optimum operating time by periodically discharging batteries. The
batteries can be charged and discharged hundreds of times. Replace the
batteries if operating time (talk and standby time) is significantly shorter than
usual.
To discharge batteries:
Note: Only use the following method to discharge batteries.
1. Turn the handset on and do not
place into charger.
2. Leave until it the handset automati-
cally switches off.