Motorola P Series Manual de venta - Página 40

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3-2

1.3

Selecting the right battery

The selection of the correct battery for a particular application will depend on many factors. A typical

procedure for battery selection is shown below:

Identify if the product will be operated in an intrinsic safe environment.

Identify the required operating temperature range. For example, inside all day in air-

conditioned ofÞce or inside a food freezing plant.

Having chosen the required performance, select the most appropriate radio battery

combination.

For most effective radio performance use only Motorola branded batteries.

With standard NiMH Battery

With NiCd Battery

Average Battery Life @5/5/90 Cycle

With standard NiMH Battery

With NiCd Battery

1.4

Memory Effect

Failing to fully discharge a battery on regular basis causes an accumulation of tiny gas bubbles and

the formation of irregular shaped crystals, which adhere to the cell plates. These irregular shaped

crystals drain the battery of its true capacity capability.

The result is the battery will only charge to the level at which it was last discharged.

For example, a person over many months routinely uses 70% of the battery capacity. In a Nickel

Cadmium battery that originally had a run time of 8 hours the run time could be reduced to only 5.6

hours after memory effect had set in.

To avoid the memory effect, use all of the available battery capacity completely.

Table 3-1 Battery SpeciÞcations

Radio Weight: (gm)

Table 3-2 Battery Selection

Part Number

PMNN4018

PMNN4019

PMNN4021

Low Power

10 hours

Description

NiMH High Capacity Battery

NiMH High Capacity Battery FM

NiCd High Capacity Battery

429

454

High Power

8 hours

ACCESSORIES