Disconnecting the battery may also result in the engine computer forgetting settings it's learned over time, so it would have to relearn them. That's not really a problem (it won't harm anything) but it might result in not quite so good performance for a little bit. If you have a state motor vehicle or emissions inspection, it probably won't pass immediately after being reconnected because some of the OBD2 checks will probably show "not ready" and the state doesn't like that. Driving around a little, maybe an hour or so, will usually be enough to eliminate the not ready states.
In short: there's no real problem in disconnecting the battery, but possibly a few quite minor annoyances.
