The tutorials need to highlight NOT running on the charger. Apparently it can damage your batteries?!
If this is correct, you should make it very clear.
I understood the importance of not discharging the batteries too far. It seemed obvious to me to just do my work with it plugged into the charger, but several of the threads indicate that it could cause damage.
You may also want to consider adding an AC adapter to the kit or making one available on the website, perhaps one that runs below full battery voltage so you can float without risking damage.