D Batteries

D batteries deliver long-lasting power for high-drain and long-duration devices used on jobsites, in workshops, and around the home. Their large size and capacity make them ideal for heavy-duty flashlights and lanterns, portable radios and speakers, air pumps, motion beacons, inspection lights, emergency kits, and certain test instruments. If you need reliable runtime without frequent swaps, size D batteries are a smart pick.

Choose the chemistry that fits your use pattern and environment. Alkaline D batteries (1.5V) offer strong performance, wide availability, and long shelf life for general use and emergency storage. Rechargeable NiMH D cells (1.2V) cut ongoing costs for frequent users; look for low self-discharge types to hold charge longer between uses. Lithium primary D options provide excellent cold-weather performance and very long shelf life, but check device voltage requirements and compatibility. Budget zinc-carbon D cells can work for low-drain items but have shorter life and poorer cold performance.

Key points and buying tips:
- Common names: D cell, size D, LR20 (alkaline), R20 (zinc-carbon), HR20 (NiMH)
- Nominal size: approx. 61.5 mm length x 33.2 mm diameter
- Typical voltage: 1.5V (alkaline/zinc-carbon), 1.2V (NiMH), specialized lithium variants may differ
- Capacity: alkaline up to ~12,000–18,000 mAh; NiMH typically ~8,000–10,000 mAh (check honest ratings)
- Shelf life: alkaline ~5–10 years; lithium primary often longer
- Temperature: lithium performs best in extreme cold; alkaline is reliable for most conditions
- For rechargeable setups, pair NiMH D cells with a smart charger that supports D size
- Avoid mixing old and new cells or different brands in the same device to prevent leakage and uneven discharge
- Store cool and dry; rotate stock and check expiry dates
- Recycle spent NiMH cells and follow local guidelines for disposal

Find quality D batteries in bulk for jobsites or in smaller packs for home projects, and keep your high-drain tools and gear running longer with fewer interruptions.