ORIGINAL: RCKen
It depends on the output of a wall wart. If it is over 7.5 volts it will charge the battery. Some wall warts are, some aren't. I guess that I should have said that in my first post. I am sorry that I didn't clarify that point. But if the charger doesn't put out voltage as high, or higher, than the max voltage of the pack you will never be able to completely charge it.
Ken
This got me to thinking so I decided to go and check the charger. On the wall charger it says the output is 4.8V so based on that I would assume it can't fully charge the battery. However, I checked the voltage of the battery with the radio system on and it reads 6.53V. How is that possible?