Terrain into Model

I'm making a 3D game for android, and ofcourse i came to optimization problem. The game currently runs at 60 fps on my galaxy s2 and i have average 40-50 batches. I tried running the game on weaker phones and it ran on about 30 fps.

I heared there is option to convert the terrain into model so it will be fully static, resulting it will take only 1 batch.

I came up with a tool in asset store called "T4M" which does exactly this, but the problem is, it is not supported for unity 5.

My question is, are there any similar tools, maybe even they are built in to unity 5 now? Basicaly i don't need any physics , shadows or whatever from the terrain. I have my terrain in game just for background visuals.

Also Is there any way to make shadows work with less lagg? When i enable shadows, even on lowest quality, it jumps my batches to 150-200.(x4 which is insane)