About this replacement
Pelican 3715Z0 LED ATEX 2015 — 4.8V Ni-MH Replacement Battery (3765-301-000)
This is a 4.8V, 1500mAh Ni-MH battery pack for the Pelican 3715Z0 LED ATEX 2015 intrinsically safe flashlight. It also fits the 3760Z0, 3765, and 3765 Right Angle Light. Capacity and voltage match the original Pelican spec exactly — no modifications needed.
- 3715Z0, 3760Z0, and 3765 series compatibility: These lights share the same 4.8V four-cell Ni-MH pack format and connector pinout. The battery housing dimensions (71.52 x 52.60 x 14.10mm) fit the shared chassis across this ATEX-rated lineup without modification.
- Bench tested on actual hardware: We cycled this pack through full charge and discharge on the 3765 platform. The cells balanced evenly across all four positions, and the light held full output until the driver stepped down at low-voltage threshold — no premature cutoff.
- Multi-cell replacement rule for ATEX torches: Replace all four cells simultaneously and always use cells from the same production batch. In hazardous-area flashlights, a single weaker cell creates imbalance under high-current draw — the weak cell inverts polarity first, which shortens pack life faster than normal discharge cycling.
Why the 3765 steps down output before the battery indicator triggers
Ni-MH cells have a gradual voltage curve — they deliver near-full voltage for most of their discharge, then drop sharply at the end. The 3765 driver monitors cell voltage in real time and steps output down before the indicator LED changes state. This protects the cells from deep discharge, which permanently reduces Ni-MH capacity. If the light dims before you expect it, the pack is genuinely near the end of its charge — the indicator is not malfunctioning.
One cell draining faster than the rest after a fresh charge
Mixing a new cell with three older cells forces the weaker cells to work harder during high-current draw, accelerating the imbalance cycle. The newest cell in the pack ends up compensating for the weaker ones and drains disproportionately fast. Over several cycles, the pack loses usable capacity well below the 1500mAh rating. Replace all four cells together — check that all cells read between 1.25V and 1.30V under load before assembling the pack.