Pelican 3315R Compatible Battery 3.2V 1800mAh LiFePO4

Pelican 3315R / 3315R-RA — 3.2V LiFePO4 Replacement Battery (3319)

This is a 3.2V 1800mAh LiFePO4 cell built to fit the Pelican 3315R and 3315R-RA rechargeable flashlights. It replaces OEM part numbers 3319, 03315R-3010-000, and 03315R-6000-56. When the original cell degrades and the light starts dimming early or losing charge between uses, this is the direct swap.

• 3315R and 3315R-RA fit: Both variants use the same 3.2V single-cell LiFePO4 platform with identical connector and form factor — 78.90 × 18.60 × 18.60mm. No modification needed. The driver circuitry in both models expects LiFePO4 voltage curves, so chemistry match matters here.
• Bench tested on actual hardware: We cycled this cell through the 3315R's charging circuit and confirmed the BMS accepted charge without fault flags. The cell reached full charge voltage cleanly and held resting voltage within spec after a 24-hour open-circuit soak.
• LiFePO4 storage behaviour: Unlike lithium-ion, LiFePO4 cells have a very flat discharge curve — the driver in the 3315R won't show a significant voltage drop until the cell is nearly depleted. Don't rely on perceived brightness alone to gauge charge state; use the Pelican charge indicator after any extended storage period.

Why the 3315R dims suddenly without warning at end of charge

LiFePO4 chemistry holds a plateau around 3.2V through most of its discharge cycle, then drops sharply near the end. The 3315R's driver runs at near-full output until that cliff, then steps down hard to protect the cell — this is not a fault. Users often mistake this for a failing battery when it's actually the driver's low-voltage protection activating at the correct threshold. A cell that dims sharply after a long run is behaving correctly. A cell that dims early in a short run needs replacement.

3315R not holding charge after sitting unused for several weeks

LiFePO4 cells have lower self-discharge than lithium-ion, but a degraded original cell can drop below the driver's minimum startup voltage during storage. If the light won't activate after weeks on the shelf, put the cell on the Pelican charger for a full cycle before assuming it's dead. A healthy LiFePO4 cell at 2.8V or above will recover normally. If resting voltage reads below 2.5V on a multimeter, the cell has over-discharged and needs replacement.