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Panasonic

Panasonic UM-1NPA/2B Super Heavy Duty D Batteries 2-Pack

★★★★★4.3 (20 reviews)

Panasonic Super Heavy Duty D batteries deliver dependable, budget-friendly power for clocks, remotes, and other low-drain devices.

$4.47*
✓ In Stock on Amazon.com
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*Price sourced from Amazon.com. Last updated:Jul 14, 2026.Price and availability are subject to change.

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Overview

The Panasonic UM-1NPA/2B Super Heavy Duty D batteries are a straightforward, cost-conscious power solution built around zinc carbon chemistry. Sold in a 2-pack, these standard D-size cells are engineered for low-drain household devices — think wall clocks, TV remotes, basic LED flashlights, and portable AM/FM radios. For these types of steady, low-current applications, the Super Heavy Duty line provides reliable voltage output at a price point well below alkaline alternatives.

It is important to understand the trade-offs of zinc carbon construction. These batteries carry less total energy than alkaline or lithium D cells, so they will not last as long under heavier loads and are not the right choice for motorized devices, digital electronics, or anything that draws significant current. Their shelf life is also more limited. However, for the devices they are designed to power, they do the job reliably and affordably, making them a practical pick for everyday household battery needs where premium chemistry is unnecessary.

Key Features

Heavy Duty D batteries

Good til 2023 or longer

Latest Technical Development.

Specifications

Brand
Panasonic
Model
UM-1NPA/2B
Battery Size
D
Battery Chemistry
Zinc Carbon (Super Heavy Duty)
Pack Count
2
Recommended Use
Clocks, remote controls, LED torches, low-drain devices

Pros & Cons

👍 Pros

  • Budget-friendly price point makes them an economical choice for low-drain household devices
  • Standard D-cell size fits universally in flashlights, clocks, radios, and remote controls
  • Zinc carbon chemistry provides stable, steady voltage output for consistent low-power performance
  • Convenient 2-pack covers common replacement needs without excess inventory

👎 Cons

  • Zinc carbon chemistry delivers significantly less capacity than alkaline or lithium D batteries
  • Not suitable for high-drain devices that require sustained heavy current draw
  • Only two batteries per pack, which may require multiple purchases for devices needing more cells
  • Shelf life is shorter than alkaline equivalents, limiting long-term stockpiling
  • Performance drops noticeably in cold temperatures compared to alkaline batteries

Frequently Asked Questions

These zinc carbon batteries are designed for low-drain devices such as remote controls, wall clocks, LED flashlights, and portable radios. They are not recommended for high-drain electronics like digital cameras or motorized toys.
Super Heavy Duty (zinc carbon) batteries have a lower energy capacity and shorter runtime than alkaline cells, but they cost less. They are a practical choice when devices draw small, steady amounts of power rather than heavy bursts.
This package includes two D-size batteries.
Like all zinc carbon batteries, they can leak if left installed well past their useful life. It is best to remove them from devices that will be stored unused for extended periods.

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