I received my JD robot kit about 1.5 weeks ago and it came with the blue battery charger. Today I got an email directing me to new info on the batter charger lesson. On the lesson it talks about the new balance charger and refers to mine as the "deprecated blue ez-robot charger". The word "deprecated" obviously got my attention since I just received this kit. Is there any concern about using the blue charger instead of the new one? Why was there a switch and what's wrong with the old blue charger? Obviously curious why I received the old one, but I know there always has to be a change-over period. Just wondering if there's anything I should watch out for or if I should be planning to upgrade. I also bought an extra battery, so I want to make sure I'm treating them right.