EnerSys CYCLON 0810-2044 Battery - 2V D Cell (Green Label)

The EnerSys CYCLON 0810-2044 is a 2-volt, 2.5Ah sealed pure-lead D cell — the same battle-tested cell format that has been trusted in professional battery pack assemblies for decades. Carrying the "Green Label" designation, this cell is designed for applications where reliability isn't optional, from medical equipment and emergency lighting to industrial controls and telecommunications infrastructure.

Built on Pure-Lead Technology

The CYCLON family has a long legacy. Sealed pure-lead cells were first developed by Gates Corporation in 1973, and EnerSys has carried that technology forward ever since. What sets these cells apart starts at the chemistry level — the use of high-purity lead-tin in a VRLA (valve-regulated lead-acid) AGM design means less internal resistance, tighter manufacturing tolerances, and better long-term performance compared to conventional sealed lead-acid cells.

That purity translates directly to real-world advantages:

• Faster recharge — EnerSys claims pure-lead chemistry can reach a 95% state of charge in under an hour
• Longer service life — CYCLON single cells are rated for a 10-year design life at 77°F (25°C)
• Better deep discharge recovery — the cell bounces back after demanding discharge cycles that would degrade conventional SLA cells more quickly

Performance That Handles the Extremes

The 0810-2044 is rated to operate across an exceptional temperature range: -85°F to +176°F (-65°C to +80°C). That's a spec you'll rarely see in sealed lead-acid cells at this form factor, and it makes these cells a strong fit for any application that sees harsh environmental conditions — outdoors, in vehicle-mounted equipment, or in uncontrolled storage environments.

The cylindrical steel can enclosure adds another layer of protection. It resists shock and vibration, provides flammability protection, and keeps the cell operating safely under pressure conditions ranging from vacuum up to 8 atmospheres. A resealable safety valve vents gas at 50 PSI if needed, then automatically reseals — helping prevent the "dry-out" failure mode associated with chronic overcharge.

Designed for Pack Assembly

Like most CYCLON D cells, the 0810-2044 is most commonly built into multi-cell battery packs rather than used as a standalone cell. The .187" Faston terminals make it easy to connect in series or parallel configurations. The compact cylindrical form factor — 1.35" in diameter and 2.41" tall — keeps pack designs tight and predictable. At just 0.4 lbs per cell, weight adds up slowly even in larger packs.

The cell is a UL Recognized Component and meets UL 1989. It's also classified as a nonspillable battery, which exempts it from many DOT packaging requirements and makes it straightforward to ship and handle.

A Smart Long-Term Investment

With a 2-year shelf life before a recharge is needed and 200 or more full depth-of-discharge cycles, the 0810-2044 is built to reduce replacement frequency and total cost of ownership. For OEM applications or equipment that gets cycled hard, choosing a CYCLON cell over a standard SLA alternative can mean fewer service calls and more uptime over the life of the equipment.