Braun Activator 8000 Replacement Battery 1.2V 2000mAh

Braun Activator 8000 Series — 1.2V Ni-MH 2000mAh Replacement Battery

This is a 1.2V Ni-MH rechargeable cell rated at 2000mAh (2.4Wh), replacing the internal battery in Braun Activator shavers. It fits the Activator 8000, 8781, 8467, and Activator 360, among others. When the original cell no longer holds a charge, this swap restores the shaver's cutting power without replacing the whole unit.

• Activator 8000 series fit: These Braun Activator models share the same 1.2V single-cell Ni-MH architecture, identical cell dimensions (50.00 × 14.80 × 14.50mm), and the same BMS charge-termination behaviour. One cell fits the full group.
• Bench tested on actual hardware: We cycled this cell through the Activator's charge circuit and confirmed the BMS accepted charge termination correctly at peak detection. Motor engagement voltage held within spec across repeated cycles with no premature cutoff.
• Charging port drying — Activator-specific: Dry the charging port completely before connecting to the charger after rinsing. Moisture bridging the charging contacts triggers a BMS protection trip the shaver reports as a dead battery — not a charging fault. A dry cotton swab clears the contacts before reconnecting.

Capacity fade from daily partial charging on the Activator

Ni-MH cells in shavers charged daily — before the pack is meaningfully depleted — develop a soft memory effect over months. The charge circuit's peak-detection termination fires earlier against a shallower voltage curve. The result is a cell that accepts less charge each cycle even though it shows full on the indicator. Running the shaver fully down to cutoff once every three to four weeks resets the cycle depth and slows this drift.

Motor speed drops before the low-battery indicator activates

The Activator's shaver motor draws a short current spike at startup that pulls cell voltage down momentarily. As a Ni-MH cell ages, internal resistance rises and that voltage sag deepens — slowing the motor before the indicator circuit registers low. The BMS cutoff threshold sits below the motor's functional voltage floor, so the indicator can still show charge while the motor is already underperforming. Replacing the cell brings internal resistance back down and eliminates the sag under load.