Metabo Powermaxx 631858000 4.8V Replacement Battery

Metabo Powermaxx / Powergrip 2 Series — 4.8V Ni-MH Replacement Battery (631858000)

This is a 4.8V, 2100mAh Ni-MH battery replacement for the Metabo Powermaxx and Powergrip 2 series of compact cordless tools. It fits drill-drivers, impact drivers, and screwdrivers across the Powermaxx, Powergrip2, and Powergrip II lines. Capacity is 2100mAh (10.08Wh) — matching the original pack specification.

• Powermaxx and Powergrip 2 platform compatibility: These models share the same 4.8V cell stack, physical battery housing, and terminal contact layout. The pack slots and latches identically across Powermaxx, Powergrip2, and Powergrip II platforms — no adapters needed.
• Bench tested on actual hardware: We cycled this pack through discharge and recharge on a Powermaxx drill-driver platform. The Ni-MH cells accepted full charge without thermal anomaly, and terminal voltage held stable through repeated motor-start inrush draws.
• First-use load cycling for Ni-MH packs: Run the tool at half load for the first two charge cycles before applying maximum torque. Ni-MH cells in compact housings benefit from a gradual initial cycle — it allows the pack's internal resistance to stabilise before heavy fastening loads are applied.

Charger blinking or refusing to accept the pack after storage

Ni-MH packs that have sat unused for several months can drop below the voltage threshold the Metabo charger requires to begin a charge cycle. The charger reads the low cell voltage as a fault and blinks rather than charging. To recover the pack, some chargers have a recovery or trickle mode — check the charger manual for this option. If yours does not, a brief trickle charge at 0.1C from a compatible Ni-MH charger can bring cells back above the acceptance threshold, typically around 1.0V per cell.

Tool bogs down or loses torque mid-fastening

This symptom points to voltage sag under load rather than a dead pack. On 4.8V Ni-MH packs, worn cell contacts or high internal resistance cause rail voltage to drop sharply the moment the motor draws current for a heavy drive. The tool bogs because the motor is not receiving its rated voltage under load. Clean the battery terminal contacts on both the pack and the tool with a dry cloth, then check rail voltage under no-load and again under a fastening load — if the drop exceeds 0.5V, cell degradation is the cause.