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TIGER HEAD HI WATT BATTERY HK CO LTD via Amazon has 4-Pack HW 3600mWh Rechargeable 9V Batteries w/ 4-Slot Charger (TH-ICP936) on sale for $23.38 – $9.12 (39%) off when you apply promo code E916HNF9 on the checkout page = $14.26. Shipping is free w/ Prime or on $35+ orders.