Peli 3315RZ0 LED Replacement Battery 3.2V 1800mAh

Peli 3315RZ0 LED Series — 3.2V LiFePO4 Replacement Battery (03315R-3020-001E)

This is a 3.2V 1800mAh LiFePO4 cell replacement for the Peli 3315RZ0 LED and 3315RZ0-RA LED flashlights. It fits the cylindrical cell bay in both variants and matches the original voltage and capacity. OEM part numbers covered: 3315RZ0, 03315R-3020-001E, and 03315R-6000-000-54.

• 3315RZ0 and 3315RZ0-RA compatibility: Both models share the same single-cell bay, driver voltage rail, and charge circuit. One cell fits both. The BMS handshake on the 3315RZ0 driver expects a 3.2V nominal LiFePO4 cell — substituting a Li-ion cell at 3.6V nominal will trip the over-voltage protection and the light will not run.
• Bench tested on actual hardware: We cycled this cell through full charge and discharge on the 3315RZ0 driver. The BMS accepted the cell without fault codes, charge termination triggered correctly at full capacity, and output current across all drive modes matched factory spec.
• LiFePO4 charge voltage on the 3315RZ0 charger: The Peli 3315RZ0 charger is calibrated for LiFePO4 termination at 3.65V per cell — not the 4.2V used for standard Li-ion. Do not charge this cell in a generic Li-ion charger. Overcharging a LiFePO4 cell above 3.65V accelerates cathode degradation and shortens cycle life significantly.

Why the 3315RZ0 steps down output before the battery indicator triggers

The 3315RZ0 driver uses brownout protection that monitors cell voltage in real time. When the cell drops below roughly 2.8V under load, the driver reduces current to the LED before the low-battery indicator activates. This is intentional — the driver protects the cell from deep discharge damage, not a fault in the replacement cell. If the light dims noticeably on high output but still shows a green charge indicator, the cell is approaching end of discharge, not failing.

Flashlight cycling through modes on its own near end of charge

Mode cycling — where the light briefly steps through output levels without input — happens when cell voltage sags below the driver's stable operating threshold under high-current draw. The driver briefly loses regulation, resets, and re-enters its startup mode sequence. Switch to a lower output mode immediately to stop the cycling. Recharge the cell when resting voltage reads below 3.0V.