What is the shelf life of a new mobile phone battery?

Know what is the shelf life of a new battery of a smartphone. Does it stays brand new if you are not using it and is just kept in storage or does it degrade and becomes unusable? Know the answers from our experts.

Battery is an important part of the mobile phone. A new smartphone battery works for years before it requires replacement since it stops charging or discharges quickly. My question is that if I keep a new battery with me and do not use it then up to what time it remains usable by charging it and keeping it in a mobile phone. In other words I want to know what is the shelf life of a new battery. Till what time I can put it in use?