The 200 is a very well designed RT ... the best in my view. However, as far as the house battery goes, I'm really left with the impression that they forgot about it and it was an afterthought ... "OMG, we forgot about the battery! Where will we put it?" the designer yelled out!. And yes, you have to install a maintenance free battery. You have to take the negative terminal off first, and then feel inside to find the positive one. Cover the negative terminal of the battery with something to avoid a short circuit. I was able to fit a bigger group 27 battery in there. Getting it back in isn't easy. I can detail how I did it, if you need the info.
