13 month old S3 will charge 30-35% in 12 hours. Shows 100% initially, but turn on the phone and shows only 30-40%. My selling kiosk says if it's over 1 year he can't help. I have 2 s2's and this s3 with koodo. I think it is the charging port on the phone. Any advice or help?
The battery needs to be replaced. The battery is also beyond the warranty period so you will have to pay out of pocket. Samsung phone batteries are available online at some big box chain retailers or on Amazon and eBay Canada.