My phone only works when charging HELP!

My Huawei Ascend p7 had a software update last 2 weeks then recently I discovered that when I put on mobile data it goes off without even showing the logo its like just removing the battery then I discovered that my phone won't even come on its shows the logo then goes off even when the battery is full then I wanted to reset to factory settings but when I went into recovery mode it showed Huawei software installation failed

I tried again the next day again rezovery mode finally came up so I'm asking should I go ahead and format the phone will it help my phone cos I can't use it without charging it or is it a battery problem.