4x D Batteries Extra Heavy Duty 720min 1.5V Cell R20 PC1300 E95 UM1 Zinc-Carbon | eBay
Amazon.com: Tenergy 1.5V D Alkaline LR20 Battery, High Performance D Non-Rechargeable Batteries for Clocks, Remotes, Toys & Electronic Devices, Replacement D Cell Batteries, 24-Pack : Health & Household