Braun Flex Integral, Contour Series 3 Replacement Shaver Heads 31S (5000 series, 6000 series) Foil and Cutter Set.
SOLVED: Rechargeble battery does not work any more - razor - iFixit
HQRP 2-Pack Batteries for Braun 6515 6520 type 5705, 6550 type 5704, 6525 type 5703, CruZer1 Model Z20, 2675 Type 5732 Razor / Shaver plus Screwdriver - Walmart.com
New Batteries for a Braun Shaver : 9 Steps - Instructables