Low Voltage Mode (Halt); Recharging And Led Decoding - ActiGraph wGT3X-BT User Manual

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Low Voltage Mode (HALT)

ActiGraph devices enter a "Low Voltage Mode" (or HALT) state when the battery discharges beyond a
point of being able to power the device. In this mode, all important variables and data are stored in
flash memory to secure the device download. Because the device's internal clock stops in HALT mode,
the device cannot be recharged and redeployed; the device must be downloaded and reinitialized to
continue use.

Recharging and LED Decoding

Recharging is automatic and is accomplished by connecting the device to a standard USB port with a USB
2.0 cable only. Charging time will depend on the battery life, but typically will not exceed three hours for
a fully depleted battery to become fully charged. Once the battery is completely charged, the green LED
will remain illuminated. If the battery voltage drops below 3.1 volts while in use, the device will not
have sufficient power to collect data and will warn the user through a series of coded flashes (see the
below table for an explanation into WGT3X-BT's LED flashes). The battery level, reported in volts, can be
viewed at any time by starting the ActiLife software and plugging in the device.
Important: ActiLife will not allow initialization if the voltage is below 3.85 volts.
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