EF Johnson 2425770 User Manual

Draft 2/8/12

Section2Battery, Accessory and Disassembly

2.1 Battery Information

S ECTION

Information

2.1.1 Battery Removal / Installation

To remove the battery from the radio for recharging or replacement, first turn the radio off.
Then press the release button (see Figure 2.1) and rotate the battery upward to the
approximate point shown and remove it from the radio.

Figure 2.1 Battery Removal

Battery Release
Button

NEEDS TO BE REPLACED

Viking Portable Radio Service Manual 2-1

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Battery, Accessory and Disassembly Information

2.1.2 Preventing Loss of Encryption Keys during Battery Change

If Infinite Key Retention is not programmed, the radio must be connected to a constant
power source to preserve the encryption keys in memory. Storage capacitors maintain the
supply voltage (and these keys) for approximately 3.5 minutes to allow the battery to be
changed. Therefore, when changing the battery of a radio containing keys, make sure to
reattach another battery within 3.5 minutes.

2.1.3 Battery Specifications

Table 2.1 contains specifications for batteries. For current advertised specifications, refer
to the specification sheet available from your sales representative. Values are typical and
are subject to change without notice.

Table 2.1 Viking Portable Portable Radio Battery Specifications

Battery Type Dimensions (HxWxD) Weight Approximate Life (5/5/90)

Ultra-High Capacity Lithium
Ion

2.1.4 Battery Charging

The following considerations apply to all rechargeable batteries:

• Be sure to carefully read the instructions for operation of the battery charger, and follow
all of them carefully.

• Do not charge the battery with radio power on.

• If batteries are not in service (i.e., in storage) be sure to recharge them at least every 12
months.

• Be sure, especially when using Nickel Metal-Hydride (NiMH) batteries, to put new
batteries (or batteries that have been inactive for a significant time) through at least
three full charge/discharge cycles initially. Otherwise the batteries may not provide the
full number of operating hours for which they are rated.

CAUTION

!

Do not transmit in close proximity to the charger base. Do not expose the charger base to
high level RF signals while a battery is being charged because this may cause a charger
fuse to blow (especially in the UHF range). Radios programmed for SMARTNET/
SmartZone operation, for example, may affiliate while in the charger which causes them to
key automatically. Therefore, do not leave radio power on while charging.

6.5 x 2.3 x .78 inches
(165.1 x 58.42 x 19.8 mm)

8.1 oz. (60.66213 kg) 12 hours

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Draft 2/8/12

Battery, Accessory and Disassembly Information

2.1.4.1 Charging Li-Ion Batteries

The Li-Ion (Lithium-Ion) battery can be charged separately or while attached to the radio.
When it is charged while attached to the radio, radio power should be turned off.

Note The Li-P battery can only be charged in an approved battery charger. Charging lithium

batteries in nickel only chargers can result in overcharging the batteries and can damage
the cells through swelling.

With radio power off, charge current begins at a set level and gradually decreases as the
battery is charged. When the charge current decreases to 100Ma, all charge current is
automatically turned off and the charger switches to Ready mode. This is indicated by a
green Ready indication. No trickle charge current is applied.

If radio power is left on, the initial charging process is as described above. However,
because the radio standby current is in excess of 100mA, the charge current never
decreases to the 100 mA charge cutoff threshold. The charger continues to charge until the
four-hour timeout is reached, then automatically switches to Ready mode. If the radio is
left with power on, the battery will slowly discharge. If the battery discharges to a set
voltage level (7.8V to 8.0V, depending upon battery type) the charger will automatically
enter recharge mode, and repeat the previously described recharge process.

WARNING

!

In summary, if the Li-Ion battery is left in the radio and charged while the radio power is
left on, the following cycle s repeated: the radio charges (approximately four hours), then
switches to Ready mode (approximately two to three hours), then switches back to
charging to begin a new cycle.

2.1.5 Battery Care

Do not incinerate a battery pack because of the risk of explosion. Also, do not short circuit
the terminals because the battery pack and the object causing the short may become very
hot. Do not disassemble or modify a battery pack.

Proper battery care enhances the useful life of the battery. The battery should be recharged
as soon a practical after the low battery indication appears. Follow the charging
instructions in the manual included with the charger. When the battery fails to hold a
charge or provides only a very short operating time, it must be replaced with a new unit.

Specified battery life is approximately 10-to-12 hours of service before recharging is
required. This time assumes that 5% of the time is spent transmitting, 5% in the receive
unsquelched mode, and 90% in the receive squelched mode. The operating time may be
less if more time is spent in the transmit or unsquelched modes, or if the battery is not fully
charged or its capacity has deteriorated. Be sure to dispose of the nickel metal-hydride
(NiMH) battery pack in accordance with local waste regulations.

Viking Portable Radio Service Manual 2-3