Question [Q] Do I Need Greenify?

Hi, i am using my Huawei Ascend P1 for about a half year. The major problem of since the first time i use this device is the battery performance, i could charge it twice or three times a day. A couple days ago i heard people talk in XDA about Greenify that can hibernate some apps so can save P1 battery life. Is it true the P1 battery can save by this tiny size apps Greenify? How does it really works? Oh, by the way im using Emotions UI 1.6 B708. Sorry if my english not so good.. Thanks before

Roma A.