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Figure 5 Soldering the wires to the charger terminals.
Attaching the battery is shown in Figure 6. IMPORTANT! First make sure that the power
switch is in OFF position. It must not be turned on before the device has been flashed with
firmware. Otherwise the I/O terminals of the FPGA are in an undefined state and this can
cause permanent damage to the device and it can become very hot. Carefully observe
battery polarity. Wires can be soldered directly to the battery terminals, taking care not to
overheat the battery. The middle contact of the battery should be left unconnected.
NWSP Wrist Unit
Tom Ahola 2008-05-15