Cool!
EDIT: I forgot that you asked about the risk. Shorting out the unprotected cells can be a big problem. I have also heard that overcharging them can be bad.
From what I understand, the protected cells have a component that monitors the temperature and shuts off the cell if it gets too high. The charging circuit on the GPA also has the ability to do this (with an added component), but it can't actually tell the battery temperature (as it's not close enough to the battery). You could, in theory, wire up a thermistor to do this, but I think a protected cell would be easier than adding a component.
EDIT: I forgot that you asked about the risk. Shorting out the unprotected cells can be a big problem. I have also heard that overcharging them can be bad.
From what I understand, the protected cells have a component that monitors the temperature and shuts off the cell if it gets too high. The charging circuit on the GPA also has the ability to do this (with an added component), but it can't actually tell the battery temperature (as it's not close enough to the battery). You could, in theory, wire up a thermistor to do this, but I think a protected cell would be easier than adding a component.
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