I plan on using batteries for my arduino and some 9v motors. mAh isn't particularly a concern, I just want the best value. I've looked at sparkfuns batteries and chargers and they seem to be low voltage and expensive when you get the charging circuit. I'm not totally against using nicad, should I just get some rechargeable AA batteries or is there a better way that has a similar cost? Would it be possible for me to make my own charging circuit for nicad AAs so I can keep them in my device and do I need any external hardware to monitor battery charge? Can I use 6 AAs to power the 9v motor unregulated or is that a bad idea?
Any tips on the issue are appreciated, this is a new subject to me. Thanks.
edit: maybe I'm thinking of NiMH, are those simple to chage like NiCad? edit2: each motor looks like it could draw up to .8A each stalled and I will be using two. They are only rated up to .3A each though, i don't plan on exceeding that.