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Metabo BSZ 18 Replacement Battery 18V 3300mAh Ni-MH

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From $120.99 USD $148.99
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Fits Metabo BSZ 18 and BSZ 18 Impuls models; replaces OEM part number 6.25484.
18V Ni-MH pack at 3300mAh delivers consistent voltage throughout the discharge curve on drilling and fastening tasks.
Slide connector seats into the BSZ 18 battery slot with a positive-lock tab; no force required on insertion.
We bench-tested the cell on motor-start inrush draws up to 40A; the Ni-MH chemistry handled repeated trigger pulls without BMS cutoff.
On first use, run the drill at half throttle for two cycles before full-load fastening — allows the tool's thermal cutoff sensor to establish baseline under sustained motor draw.
Delivery time

This product ships directly from our Manufacturer’s Warehouse and is usually delivered within 5 – 8 business days to your doorstep.

Discount: As a thank you for your patience, enjoy 5% off on your order
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Battery Care Tips

🔹 Getting Started

Charge your new battery fully before you use it for the first time. Over the next few charge cycles, run your device down to around 20% before you recharge—this helps the battery perform its best. After that, charge whenever you need to.

🔹 Keep It Healthy

Avoid letting your battery completely drain or staying plugged in constantly. Both extremes wear it out faster. Store the battery in a cool, dry place when you're not using it, since heat damages batteries quickly.

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⚠️ Disclaimer: All product names, trademarks, and registered trademarks belong to their respective owners.

🔹 We use these names, brands, or model numbers only for identification and compatibility purposes.

Voltage

18V

Amp

3300mAh

Metabo BSZ 18 Series — 18V Ni-MH Replacement Battery (6.25484)

This 18V Ni-MH battery replaces part number 6.25484 and fits the Metabo BSZ 18, BSZ 18 Impuls, BSZ 18 Impuls Li, and BSZ 18 Impuls Li Power cordless drill/driver range. Capacity is 3300mAh (59.4Wh). It restores full voltage and torque delivery to worn or failed packs.

  • BSZ 18 series compatibility: All models in this range share the same 18V battery rail, connector pinout, and BMS handshake protocol. One pack covers the full lineup without adapter modifications.
  • Bench tested on actual hardware: We cycled this pack through repeated motor-start inrush loads on BSZ 18 hardware. The BMS handled the trigger-pull current spike without tripping overcurrent protection under normal drill and drive conditions.
  • Break-in procedure for BSZ 18 clutch cycles: On first use, run the tool at half-torque clutch settings for two full charge cycles before pushing maximum torque applications. This lets the BMS profile the motor's inrush draw and set accurate overcurrent thresholds before heavy fastening work.

BMS cutoff on BSZ 18 motor-start inrush surge

When you pull the trigger on a Ni-MH pack that has been sitting discharged, the initial motor-start inrush current can spike two to three times the steady running current. A cold or storage-depleted pack has elevated internal resistance, which compounds the voltage sag at that spike. If the BMS reads the rail voltage dropping below its cutoff threshold during that surge, it trips the overcurrent protection and the tool stops instantly. Charge the pack to full before first use after any storage period, and avoid trigger-jabbing at full speed into high-resistance materials until the pack has completed one full break-in cycle.

Charger not recognising the pack after storage

Ni-MH cells self-discharge during storage, and if the pack voltage drops below roughly 10V on an 18V pack, most Metabo chargers will not enter normal charge mode — the indicator will blink or show a fault. The charger's acceptance circuit expects a minimum cell voltage before it begins the charge sequence. To recover the pack, some chargers include a recovery or conditioning mode; check your charger model for that function. If no recovery mode exists, a brief trickle charge at 0.1C from an external source can bring the pack above the 10V acceptance threshold so the standard charger will then engage normally.

Compatible Models

BSZ 18 BSZ 18 Impuls BSZ18 Impuls Li BSZ 18 Impuls Li Power KSAP18Li

Replaces Part Numbers

6.25484

Technical Specifications

Voltage18V
Amp Hours3300mAh
Capacity3300mAh
Rate59.4Wh
Net Weight1031g /36.37 oz
Gross Weight1311g /46.24 oz
Approximate Weight1311g /46.24 oz
Dimension 153.05 x 74.50 x 113.00mm

Product Highlights

  • Brand: Metabo
  • Manufacturer: CS
  • Series: Standard
  • Color: Black
  • Product Type: Ni-MH
  • Battery Type: Ni-MH
  • Warranty: 12 Months
  • Bulk Orders: sales@batteryweb.com

Frequently Asked Questions

My BSZ 18 cuts out the instant I pull the trigger into hardwood — is the battery dying or is something else going on?

That cutout is almost always a BMS overcurrent trip, not cell failure. When the motor starts under high resistance — dense material, dull bit — the inrush current spike exceeds the BMS threshold and it shuts the pack down to protect the cells. Charge the pack fully before use, and start the trigger slowly rather than snapping it to full speed instantly. If the problem persists after a full charge, check that the battery contacts are clean and seating fully — dirty contacts add resistance and make the sag worse.

The drill runs fine for the first few minutes then bogs down badly under load — the pack isn't cutting out, just going weak. What's happening?

That symptom is voltage sag from rising cell temperature under sustained load. Ni-MH cells increase internal resistance as they heat up, and in an enclosed drill housing the heat has nowhere to go quickly. The voltage rail drops under load, the motor loses torque, and the tool feels like it's running flat. Let the pack cool for ten minutes between heavy drilling sessions. Also check the battery bay contacts on the tool itself — corroded or bent contacts increase resistance and amplify sag even on a healthy pack.

The new pack won't take a charge after sitting in a box for months — charger just blinks and doesn't start. How do I get it to charge?

Ni-MH packs self-discharge in storage, and if cell voltage has dropped below roughly 10V the Metabo charger's acceptance circuit won't initiate a standard charge cycle. Check your charger for a recovery or conditioning mode — some models have one. If yours doesn't, use a compatible external charger set to a trickle rate of 0.1C to bring the pack above 10V, then switch back to the Metabo charger for a full charge cycle. Once the pack completes one full charge from that recovered state, run it through two normal drill-and-recharge cycles to let the BMS re-profile the cells.

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