Akku-King Battery Compatible with Leifheit BFN18650 1S1P Li-Ion 1400 mAh 3.2 V for Leifheit Dry & Clean, 51000, 51002, 51113, 51114: Amazon.de: Electronics & Photo
Cameron Sino 3400mAh Battery for Leifheit Dry&Clean 51000, Dry&Clean 51002, Dry&Clean 51113, 51114, this is 3.7V version!|Digital Batteries| - AliExpress