Powering The T7406; Battery Charge Controller - Nortel T7406 Installation Manual

Powering the T7406

The T7406 design has taken into account the need to provide a reliably-
powered cordless business telephone. The T7406 utilizes premium
1400 mAh NiMh batteries.
A fully charged 1400 mAh battery should provide four to five hours of
talk time in a typical eight-hour day over, approximately, a three-year
service life.
The T7406 has been engineered to provide the following talk-time
parameters:
• T7406 users should feel comfortable using the handset for an entire
workday without the need to put the handset back into the charger
cradle for charging or topping up.
• Studies have shown that users have been able to get four to five hours
of talk time from a fully charged 1400 mAh battery.
• Traffic studies have shown that typical users do not usually need
more that three hours of talk time in an eight-hour day.
• If talk times exceed four hours or the product is to see use through
multiple, consecutive shifts, multiple spare batteries are strongly
recommended.

Battery Charge Controller

The T7406 incorporates a special handset battery charge controller that
employs a four-stage charging program that sequences charging from a
soft start to a fast charge, and then to a topping charge, followed by a
maintenance charge.
This four-stage charge sequence presents an optimum-charging plan
that helps maximize the overall life of the battery by managing two
critical elements in the battery charging process, the charge rate and
overcharging protection. Note that NiMh batteries do not exhibit
memory problems and it is not necessary to drain the batteries prior to
recharging.
Low battery status is indicated on the handset by the visual charge
status on the display and/or the audible warning tone.
The T7406 handset can be placed back into the charge cradle for
charging when it is not in use.
Provisioning the T7406 / 13
T7406 Installation Guide