MOD-10-1164
sepura
TETRA Terminals
Product Guide
October 28
th
2011
Page 23 of 36
Issue 5
© Sepura plc 2011
Battery Charging
The battery should only be charged with Sepura plc approved
battery chargers. Failure to use an approved battery charger
will invalidate the warranty of the battery and the hand-held.
A range of battery chargers is available that allow the battery
to be charged while fitted to, or removed from, the hand-held
(depending upon the charger model and hand-held type
selected). When the battery is fitted to the hand-held, the
battery can be charged via the facility connector located at the
base of the hand-held. If the battery is charged with the hand-
held switched on, the time remaining to charge the battery to
its full capacity is shown on the hand-
held‟s display.
When charging, the colour of the LED on the hand-held
indicates the progress of battery charging: orange shows charging in progress, green shows
charging complete, red shows charging failure. A fully discharged battery may not provide
enough power to support the hand-held display during the initial phases of charging.
However, when sufficient power is available, the display will operate.
The battery includes circuitry to protect against damage caused by accidental shorting
of the contacts. Once the battery has protected itself, it will not operate again until it
has been removed from the hand-held and charged.
The hand-held warns the User of a Low battery condition by
displaying the Low battery Icon and repetitively flashing the
Red LED for 1 second at 1 second intervals. The Battery Level
indicator at the left hand side of the screen is also displayed in
red on the SRH3800 and SRH3900 radios.
As with all batteries, charging cycles reduce the cell capacity. The battery is specified to have
retained a nominal 80% of its original fully charged capacity after 500 charge cycles. Charging
must be conducted using a Sepura approved charger.
Batteries have a finite life; they deteriorate if they are not charged on a periodic basis.
Batteries should not be left for more than 6 months without recharging as the cells will
deteriorate and the batteries will not be recoverable.
Many professional and consumer products from cycle lamps to mobile phones and laptop
computers now use rechargeable lithium-ion (Li-ion) cells because of their small size and high
energy density. When charged and used correctly these are reliable and safe. There are
some simple precautions that should be observed when charging and using Li-ion packs. The
precautions below apply to most/all Li-ion battery packs and chargers.
1. Properly designed Li-ion batteries and chargers contain effective protection circuitry to
safeguard the pack during charging and use, but in some very rare circumstances of
internal cell failure during charging, the protection circuits may be ineffective and the pack
may overheat. To minimise the chance of this causing further damage, Li-ion battery
chargers should be used in well ventilated areas away from combustible material. For
example, don‟t charge your TETRA battery, mobile phone battery or laptop battery with
the battery and charger very near to curtains, soft furnishings, paper or other combustible
material.
