[Al Skierkiewicz]

I think it is important to add a little info here. If you run your batteries down to 3 volts (or a voltage that will not power the CRIO) it is possible that some chargers may not begin a charge cycle. Smart chargers may see that condition as you trying to hook up a 6 volt battery or something even less. Establish some method of getting batteries on the charger at regular intervals in your build and test season. Also, do not try to charge batteries that are warm to the touch. Wait an hour, just like swimming and eating.