ActiGraph CPW01 Technical Manual page 4

Document No:
E.200.4038
Revision: 0
in low ambient temperatures. Also, every three (3) months devices need to be plugged in to monitor
their voltages and charged in order to extend the life expectancy of the battery. Using the backlight on
the device screen will impact the battery capacity.
Table 2 demonstrates the impact the storage has on the long term capacity of the battery.
Temperature
0℃
25℃
40℃
60℃
Table 2: ​
E stimated recoverable capacity when storing a battery for one year. Elevated temperature ​
hastens permanent capacity loss. Lithium-ion is sensitive to charge levels (​ D ata is from
IMPORTANT: ActiGraph's devices do not come fully charged from the manufacturer and are
recommended to be charged fully before their initial use. If the battery performance is not performing
as expected, call ActiGraph's Customer Service immediately.
2.3 Device Storage and Life Expectancy
The CPW01 is recommended to be stored at 20°C to achieve the maximum life expectancy and battery
life performance. The minimum/maximum storage temperature range is between -20℃ and 55℃. For
optimal battery life performance, routinely charge the device as described above.
The only limiting factor of an ActiGraph device when calculating life expectancy is the battery. The
battery has a life expectancy of five (5) years but can be replaced by ActiGraph personnel thus extending
the life of the device. The performances of the components inside the device do not degrade over time
so the life expectancy of a device is immeasurable.
2.3.1 Low Voltage Mode (HALT)
CPW01 will enter a "Low Voltage Mode" (or HALT) state when the battery discharges beyond 3.1 volts.
In this mode, all important variables and data are stored in flash memory to secure the device
download. The device can be downloaded via the CentrePoint system. Once the device's battery has
been charged to an acceptable level the CentrePoint system can restart/resume the devices data
collection.
CentrePoint Insight Watch Technical Manual
Recoverable Capacity when stored at
40% charge
98%
96%
85%
75%
batteryuniversity.com ​ )
Page 4 of 10
Recoverable Capacity when stored at
100% charge
94%
80%
65%
60% - After 3 Months