User's Manual

3 Batteries and Power

28 SPSx50 Modular GPS Receiver User Guide

External power

The external power source is always used in preference to the internal batteries. When

there is no external power source connected, or if the external power supply fails, the

internal battery is automatically used. In this way the internal battery acts as an

uninterruptible power supply covering times of power failure. The internal battery will

only charge from an external power source which delivers more than 15 volts, for

example, an AC power adaptor.

During static measurement data logging, if no external power is supplied and the

internal battery is drained, the receiver will switch off. However, all collected data is

secure. If the receiver is operating as a base station when this happens, the receiver

will power down and stop transmitting corrections. When power is restored to the

receiver, it will resume operation in the same status that it was in when power was lost,

using the same settings as before the shut down.

Battery performance

Batteries perform best when they are not used in extreme temperature conditions. The

receiver is designed to be used in operating temperatures of –40 °C to +65 °C (–40 °F

to +149 °F). However, extremely cold temperatures of less than 0 °C (32 °F) can cause

the battery life to quickly drop. Do not expose the receiver to storage temperatures

outside the range –40 °C to +70 °C (–40 °F to +158 °F).

To protect the battery from deep discharge (5 V or less), the receiver is designed to

switch power sources or cease drawing power when the battery pack discharges to

5.9 V. A battery that has reached the deep discharge level cannot be recharged and

must be replaced. The following recommendations provide optimal performance and

extend the life of your batteries:

• Fully charge all new batteries before use.

• Do not allow the batteries to discharge below 5 V.

• Keep all batteries on continuous charge when not in use. Batteries may be kept

on charge indefinitely without damage to the receiver or batteries.

Battery safety

The receiver is powered by a rechargable Lithium-ion battery. Charge and use the

battery only in strict accordance with the instructions below.

WARNING – Do not damage the rechargeable Lithium-ion battery. A damaged battery

can cause an explosion or fire, and can result in personal injury and/or property damage.

To prevent injury or damage:

– Do not use or charge the battery if it appears to be damaged. Signs of damage include,

but are not limited to, discoloration, warping, and leaking battery fluid.

– Do not expose the battery to fire, high temperature, or direct sunlight.

– Do not immerse the battery in water.