Default [Q] Charging issues

I'm using an S3 running 4.3. I've started having a strange charging issue recently. When I plug my phone in at night the charge indicator comes on. In the morning it shows 100% right after unplugging. Within about 10-15 minutes it shows 20-28%. I thought battery was going bad so I swapped to a different battery and the exact same thing is happening. Any ideas?