Streamlight BEARTRAP 7.4V Compatible Battery 5200mAh Li-ion

Streamlight BEARTRAP / BearTrap Work Light — 7.4V Li-ion Replacement Battery (61522)

This is a 7.4V, 5200mAh Li-ion replacement battery for the Streamlight BEARTRAP and BearTrap Work Light. It slots into the same battery bay as the original 61522 pack, restoring output across all drive modes. At 38.48Wh, capacity matches the factory specification.

• BEARTRAP and BearTrap Work Light fit: Both models share the same 7.4V two-cell Li-ion architecture, battery bay dimensions, and connector pinout. The same BMS handshake clears on both — no adapter or firmware workaround needed.
• Bench tested on actual hardware: We ran this pack through the BEARTRAP's driver at full output. The BMS held voltage above the driver's brownout threshold through sustained high-current draw before stepping into protection — cell balance stayed within spec across the full discharge cycle.
• Two-cell replacement rule: The BEARTRAP runs two Li-ion cells in series. Always replace the whole pack — not individual cells. Installing a partially cycled original cell alongside a fresh one creates an imbalance under high-current draw that can damage the weaker cell rapidly.

Why the BEARTRAP steps down output before the indicator reads low

The BEARTRAP's driver monitors cell voltage in real time. At high output, current draw is significant — pack voltage can sag below the driver's brownout threshold while the fuel gauge still reads partial charge. The driver steps output down to protect the cells and itself, not because the battery is empty. This is normal behaviour. Switching to a lower mode immediately stabilises voltage and restores a usable output level.

Flashlight cycling through modes or flickering at end of charge

When a Li-ion pack approaches its low-voltage cutoff, the driver repeatedly attempts full output, sags below threshold, drops back, then tries again — producing a cycling or flickering effect. This is the BMS and driver interacting at the edge of the discharge curve, not a fault with the light or the battery. A degraded original pack accelerates this behaviour because aged cells have higher internal resistance, which increases voltage sag under load. Replace the 61522 pack and cycle the new battery fully once before field use to let the fuel gauge recalibrate.