User's Manual
5Mbps Draft
R03.h RT 1000 1.5.0 Deployment Guide 79
© 2010-2012 Wireless Seismic, Inc. All rights reserved.
7. Batteries
Charging Lithium Ion Batteries
Remove the batteries from the WRU for storage
The recommended storage temperature for Lithium ion batteries is as follows:
● From -20°C to +45°C for a maximum period of one month
● From -20°C to +35°C for a maximum of 6 months, after which time the
battery packs will need to be recharged to above 50% capacity
● Storing at cooler temperatures slows down self discharge and capacity loss
over time. Store the batteries at 25°C or less if possible
The recommended storage charge levels are as follows:
● Charge (or discharge) batteries to a 30% to 50% charge level before
placing into storage. Higher or lower charge levels can reduce the battery
life.
● Never store the battery completely depleted of charge unless for disposal.
● Periodic charging is necessary to maintain 30% to 50% charge when stored
for a long period of time
Store batteries in a well ventilated area
Do not leave batteries unused for extended periods of time, either in the
product or in storage. When a battery has been unused for 6 months, check
the charge status and charge or dispose of the battery as appropriate.
Routinely check the battery’s charge status
Consider replacing the battery with a new one if you note either of the
following conditions:
● The battery run time drops below about 80% of the original run time
● The battery charge time increases significantly
7.2 Charging Lithium Ion Batteries
This section describes charging precautions and provides an overview of the
battery charger.
7.2.1 Charging Precautions
Observe the following charging precautions:
Prior to charging, inspect the battery for any visible damage to the case or
connector that could create an electrical shortage.
The temperature range over which the battery can be charged is
0°Cto+45°C.
Charging the battery outside of this temperature can cause the battery to
become hot or to break.
Be absolutely sure that only a 5 V source is used when charging the battery.
Care should be taken to charge batteries on a fireproof surface.
Do not charge batteries near flammable items or liquids.
Keep a Class C Dry Chemical fire extinguisher nearby.