Are you satisfied with your phone's battery?

I am completely not happy with my phone's battery. Every time I use it, the battery goes down twice every 30 seconds to a minute. Even when I lock it, it decreases faster and faster. And the worst thing is when it is on around 90%, then when I turn it off, the battery is on like 50%. I don't know what do to so I just charge it every time when I use it. I think I should probably get a new phone.