Bosch Eisemann Halo 6 Replacement Battery 6V 8000mAh

Bosch Eisemann Halo 6 / B6008 — 6V Ni-Cd Replacement Battery (90700501)

This is a 6V, 8000mAh Ni-Cd replacement battery for the Eisemann Halo 6 and Eisemann B6008 portable flashlights. It matches OEM part number 90700501 and drops into the same battery compartment as the factory pack. Capacity figures are taken directly from the product specification — 8000mAh / 48Wh.

• Halo 6 and B6008 compatibility: Both flashlights run the same 6V cell configuration and share the 90700501 connector and BMS handshake requirements. Swapping between them uses this same pack — no wiring changes needed.
• Bench tested on actual hardware: We cycled this pack through full charge and discharge on the Halo 6 platform. The BMS engaged correctly at low-voltage cutoff and accepted charge without thermal fault at standard Ni-Cd charge rates.
• Multi-cell replacement rule for the Halo 6: The Halo 6 pack contains multiple Ni-Cd cells wired in series. Replace all cells simultaneously from the same production batch. Mixing a new cell with a degraded old cell forces the weaker cell to absorb excess current during discharge — it drains first and can reverse-charge under high-draw operation, shortening the whole pack's life.

Halo 6 dimming before the low-battery indicator triggers

Ni-Cd cells under load drop voltage faster than their resting voltage suggests. The Halo 6 driver steps output down when cell voltage sags below its brownout threshold — this happens before the indicator circuit reads the pack as low. It is a protective response from the driver, not a fault in the battery. A fresh, fully cycled 90700501 pack maintains higher cell voltage under draw and delays this step-down noticeably compared to a degraded pack.

Turbo mode runtime significantly shorter than expected on the B6008

Turbo mode on the B6008 draws substantially more current than standard output — the LED driver pulls peak current that can be five to ten times the standard-mode draw. Ni-Cd cells have a rated capacity at a reference discharge rate; at the higher current of turbo, effective capacity drops. This is not a battery defect — it is the physics of high-rate discharge on any Ni-Cd cell. Switch to standard mode for extended operation and reserve turbo for short bursts where full output is required.