Can I get away with just new battery or do I need a new phone

About half an hour ago I dropped my phone on the floor (on the carpet to be specific) and I tought "Meh it's a CAT it will be fine" i noticd it powered off (somnething that happens pretty often when I drop it - which happens even more often) and powered it back on. Since the micro usb cable gets detached pretty easy I also noticed that each time the ringtone for ejected usb on my PC triggers the phone powers off. I opened the phone to check is the battery in place (had an unusually harder time opening it compared to previous times) removed the battery and saw http://ift.tt/29gDL66 & imgur.com/7LdyfdR - low quality but you should get a basic idea of what happened <notify me if the links are dead cause Im not used to uploading anything>. its 05:45 am so I had to use whisky to clean the insides with cotton because I ran out of alcohol and wraped the battery in plastic ASAP. I have no other batteries around so I can't test is the phone working as intented with the corrosion. A ssaid in the title do i need just a new battery or i should go back to my phone from 2004 :D

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