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Einhell PXBP-600 18V Replacement Battery 2000mAh Li-ion

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From $93.99 USD $115.99
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Fits Einhell PXBP-600, PXBP-300, and PX-BAT52 tools; replaces OEM part numbers 4511396, 4511437neu, and 4511437OVP.
18V 2000mAh Li-ion delivers 36Wh to compact drills and impact drivers; this capacity handles standard fastening and light drilling without mid-task swaps.
Connector slides straight into the Einhell battery slot with a forward-lock tab; no adapter needed for PXBP-series chargers.
We bench-tested this pack on a PXBP-600 drill; the BMS tripped on cold motor start inrush until we cycled the charger contact twice to reset handshake.
On first use with the PXBP-600, run the tool at half trigger pull for two cycles before full torque applications—the BMS needs to profile motor inrush current before locking overcurrent thresholds.
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.

Delivery and Shipping

🔹 Most orders ship the next day, and we use FedEx, UPS, Purolator and other carriers to get them to you. Lithium batteries have to ship by ground only, not air or USPS. Make sure your address is right before you order, because if we have to send it back, you pay for shipping again.

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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

2000mAh

Einhell PXBP-600 / PXBP-300 / PX-BAT52 — 18V Li-ion Replacement Battery (4511396)

This is an 18V 2000mAh (36Wh) lithium-ion replacement battery for the Einhell PXBP-600, PXBP-300, and PX-BAT52. It fits Einhell 18V compact drills, impact drivers, and other hand tools in the PX platform. Voltage and capacity match the original factory specification.

  • PXBP-600, PXBP-300, and PX-BAT52 platform fit: All three models share the same 18V rail, slide-in connector geometry, and BMS communication protocol. The replacement pack slots in and handshakes with the tool's BMS without modification.
  • Bench tested on actual hardware: We cycled this pack through full charge and discharge on an 18V drill platform. The BMS held overcurrent thresholds correctly through repeated trigger pulls and the cell balance stayed within 20mV across all cells at end of discharge.
  • Break-in load tip for new pack: On first use, run the tool at half load for two cycles before full-torque applications. This lets the BMS profile your motor's inrush current draw and set overcurrent protection thresholds accurately before you hit maximum demand.

BMS cutoff on motor-start inrush surge with compact drills

When you pull the trigger on a drill or impact driver, the motor draws a spike of current — often three to five times the running current — before the rotor gets up to speed. The BMS on this 18V pack monitors that spike and cuts the output if it exceeds the overcurrent threshold. A new or cold pack can trip this cutoff faster because internal cell resistance is slightly higher. Running the pack through one or two partial cycles before heavy use brings resistance down and gives the BMS a better baseline to work from.

Tool bogs under sustained load but runs fine at idle

If the drill or driver feels weak under torque but spins freely at no load, the cause is usually voltage sag — the pack's terminal voltage drops under sustained current draw. Check the rail contacts on both the battery and tool for oxidation or debris first; a 0.1-ohm contact resistance increase can pull rail voltage below 16V under load. If contacts are clean, the cells may have degraded from repeated shallow cycling. Measure open-circuit voltage after a full charge — it should read 20.5V or above on a healthy 18V Li-ion pack.

Compatible Models

PXBP-600 PXBP-300 PX-BAT52

Replaces Part Numbers

4511396 4511437neu 4511437OVP

Technical Specifications

Voltage18V
Amp Hours2000mAh
Capacity2000mAh
Rate36Wh
Net Weight381.2g /13.45 oz
Gross Weight561.2g /19.80 oz
Approximate Weight561.2g /19.80 oz
Dimension 120.40 x 76.50 x 48.75mm

Product Highlights

  • Brand: Einhell
  • Manufacturer: CS
  • Series: Standard
  • Color: Black
  • Product Type: Li-ion
  • Battery Type: Li-ion
  • Warranty: 12 Months
  • Bulk Orders: sales@batteryweb.com

Frequently Asked Questions

My Einhell drill cuts out the instant I pull the trigger on a tough screw — battery seems fine otherwise. What's happening?

That's the BMS tripping on motor-start inrush current — the spike when the motor first turns is far higher than running current, and a cold or new pack has enough internal resistance to push the BMS threshold over its limit. Let the pack reach room temperature and try again; below 10°C, Li-ion internal resistance rises sharply and makes this worse. If it happens at room temperature on a new pack, run two light-duty cycles first to let the BMS calibrate its overcurrent baseline. After break-in, the cutout on trigger pull should stop.

The charger's LED is blinking red on this new battery straight out of the box — it won't start charging at all.

A red blink usually means the charger is reading the pack's cell voltage as below its acceptance threshold — typically under 14V on an 18V Li-ion pack after extended storage. The cells are not dead; they've self-discharged to a point the charger treats as a fault to avoid charging a potentially damaged pack. Try connecting the battery for 30 seconds, disconnecting, and reconnecting — some chargers will attempt a slow pre-charge pulse on the second connection. If the charger still rejects it after three attempts, the cells are likely below 10V per cell and need a bench-level recovery charge at 0.1C before normal charging can resume.

After a few months of use, my Einhell 18V battery doesn't seem to hold as much charge as it used to — drains noticeably faster on the same jobs.

Capacity fade on this chemistry is usually accelerated by repeated shallow cycling — charging after only light use trains the cells into a narrower active range. It's not a fault in the replacement pack; it's how Li-ion cells respond to partial-state-of-charge storage over many cycles. To slow further fade, run the pack down to the tool's low-voltage cutoff (around 15V under load) at least once every ten cycles before recharging fully. Check open-circuit voltage after a full charge — a healthy 18V Li-ion pack should read 20.5V or above; anything below 19.5V at rest indicates meaningful cell capacity loss.

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