Battery - ActiGraph wGT3X-BT User Manual

www.theactigraph.com
Stopping the device
In order to stop the device from collecting data, the device needs to be plugged into and computer with
the ActiLife Software running. One easy way to stop the device from collecting data is to set a stop time
during initialization. Once a device is told to stop, it will go into HALT mode and go into a low power
stopped state. Another way to get a device to stop collecting data is to plug it into a computer with the
ActiLife Software running and update the firmware on the device. This also will put it into HALT mode
and have the device go into a lower power stopped state.
Unexpected operations and events
If a device performs in an unexpected manner and does not collect data, does not perform as long as
expected, will not download data, or acts in any other manner that is unexpected, notify ActiGraph
immediately. ActiGraph's Customer Service can be contacted at the phone number (877) 497-6996 and
is available every week, Monday through Friday, 8A.M. to 5P.M Central Standard Time. Customer
Service may also be contacted through email at support@theactigraph.com.
Household Interference
Within a household environment many different factors can negatively affect the device. Putting a
device close to hot sources, such as a fireplace and baseboard heater, will melt the housing of a device
and destroy it. Putting a device in the freezer for extended periods of time will reduce the capacity of
the battery's lifespan and negatively affect its performance. Putting a device in a microwave will destroy
various parts of the device and possibly completely destroy it. Wireless internet connections, wireless
television service, and other wireless services will not negatively affect the performance of the device.
As a rule of thumb, do not put the device in extreme cold or hot temperatures and do not apply any
electrical sources to the device unless explicitly approved and described by ActiGraph.

Battery

All ActiGraph devices use a lithium polymer rechargeable battery that has a maximum voltage of
approximately 4.20 volts and have a total life expectancy of five (5) years. Even though these batteries
are replaceable, only ActiGraph personnel are to replace the batteries. At 3.1 volts the devices enter a
low voltage mode state (HALT mode).
In order to slow the aging of the lithium polymer battery, it is recommended that devices be stored in a
partially charged state (40 – 60% battery capacity) in low ambient temperatures. Every three (3) months
plug the devices in to monitor their voltages and to extend the life expectancy of the battery. Table 4
demonstrates the impact of storage temperature and charge state on battery long term capacity.
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