So I have a battery drill, and ryobi or ridgid tool set, and all of the battery no longer accept charges. Debating on purchasing new battery, or just buying a new kit. I know Dewalt is the best and contractor grade, not sure it's worth the price but... you get what you pay for and all that. I'd like to have a drill, circ saw and recip saw. Currently checking out the lowes sales for these 10 piece and 7 piece sets. Anyone know if the 20 volt Max is that much better than the 20 volt non-max? All opinions welcome.