A green cover for the S3, which dwarfs the BV-T4D battery for my 950XL.
Also purchased, but not in picture is a battery for a L640
Edit: Got it from a chines site Taobao. Its cheap, so no complaints.
I had it fully drained and re-charged up the BV-T4D, it reached 100% and on its first use I managed to squeeze ~14hrs use out of it, from 630am to 800pm. Which was about what I managed when the phone was new a year ago.
... !