Braun Series 3 Electric Razor disassembly and battery replacement (original and AA NIMH batteries) - YouTube
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HQRP 2-Pack Batteries for Braun FreeGlider Model 6680, 6690, Type 5710 Razor / Shaver plus Screwdriver - Walmart.com
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HQRP 2-Pack Batteries for Braun Series 3 Model Type 5772, 390cc-4, Type 5411, 350, 5873 Razor / Shaver plus Screwdriver - Walmart.com
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2pcs Original Ni-mh Rechargeable Battery For Braun Electric Shaver Series 1 140 150 3000 4000 5000 5685 W809 - Rechargeable Batteries - AliExpress