Lenovo vibe pi m is the budget phone with great specification and a huge 4900mah battery sealed inside. For me it is more than enough juice for a day using it Heavily. Display quality is good nice color reproduction.camera quality is average.2GB ram And extra memory card expansion makes it perfet buy for me at this price range.their is also a dedicated key for ultra power saving mode.i also got a nice quality back cover and screen protector inside the box.build quality and form factor is average.