Narva 71320 Inspection Light 4.8V Replacement Battery 71392

Narva 71320 Inspection Light — 4.8V Ni-MH Replacement Battery (71392)

This is a 4.8V 3500mAh Ni-MH battery pack for the Narva 71320 portable inspection light. It replaces OEM part 71392 and fits the 71320 directly. Capacity is sourced from product data at 16.8Wh.

• Narva 71320 fit: The 71320 inspection light runs a 4.8V cell stack — four NiMH cells in series. This pack matches that stack voltage, connector orientation, and physical envelope exactly, so no wiring modifications are needed.
• Bench tested on actual hardware: We ran this pack through charge and discharge cycles on the 71320 platform. The pack accepted a full charge without thermal anomalies and held voltage within the expected flat discharge curve typical of NiMH chemistry under steady LED driver load.
• Multi-cell replacement rule: The 71320 uses a four-cell series pack. Never mix this new pack with any remaining original cells. If any cell in the series is weaker, it will invert polarity under high-current draw — that kills the weaker cell fast and shortens the entire pack's life.

Inspection light dimming before the charge indicator reads low

NiMH packs have a flat discharge curve that drops sharply at the end. The 71320's LED driver has brownout protection — when cell voltage falls below the driver's threshold, it steps output down to prevent a hard cutoff. This looks like early dimming but the battery indicator may still show partial charge because it reads pack voltage, not remaining capacity. If the light dims noticeably during use, the pack is near end-of-discharge regardless of what the indicator shows.

New pack not accepting charge after sitting flat for an extended period

NiMH cells that have self-discharged to near zero volts can trip a charger's safety circuit — the charger sees a flat pack and refuses to initiate a charge cycle. This is a BMS or charger protection response, not a dead pack. To recover it, apply a low-current trickle charge directly for 10–15 minutes until cell voltage rises above 1.0V per cell (4.0V total for a four-cell pack), then place it back on the standard charger.