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hello guys , i have a sudden problem till yesterday my iphone worked perfectly but today morning when i charged my phone it only charges to 4 % and turned off and now it opens and turned off. only logo of apple is shown and turns off. this process repeats but it doesn’t open. please guys help me. Thank you

Replace battery? Guide to replace battery: iPhone 4 Battery Replacement You can buy an iFixit Replacement Battery from here: iPhone 4 Battery