1/2 AA 3V VARTA Lithium Battery 6127 CR 1/2AA L14250 + ON BOTTOM | eBay
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EEMB ER14250 LS14250 1/2AA 3.6V 1200mAh Lithium Battery half aa batteries Li-SOCL₂ Non-Rechargeable Battery for Dogwatch Dog Collar and Some of Movement Monitor/Home Security/Alarm System (10): Amazon.co.uk: Electronics & Photo