Amazon.com: Synergy Digital CMOS/BIOS Batteries, Compatible with Sony Varta 2/V30H CMOS/BIOS, (Ni-MH, 2.4V, 20 mAh), Replacement for Sony 2/V15H Battery, Combo-Pack Includes: 4 x SDBU-H6926 Batteries : Health & Household
Amazon.com: 16 x Varta V15H NiMH Button Cell Batteries : Health & Household
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Genuine Varta Rechargeable Ni-MH Bios Real Time Clock Battery 2/V15H S043A 15mAh | eBay