Welcome to our store. Your trusted source for batteries and power solutions. Learn more

For support or quotes: sales@batteryweb.com
WELCOME5
BatteryWeb

Laser Alignment LB-4 Ni-MH Replacement Battery 8.4V 8000mAh

Up to 19% off
New arrival
From $200.99 USD $247.99
Shipping calculated at checkout.
Fits Laser Alignment Laser Beacon LB-4 laser level, replaces OEM part numbers LB-4 and LB-4C.
8.4V Ni-MH pack at 8000mAh delivers steady voltage to the levelling motor and laser diode without sag during active measurement cycles.
Connector slides straight into the battery bay with a single locking tab on the right edge—orientation is keyed and accepts no reverse insertion.
We bench-tested this cell on a cold LB-4 unit; the BMS engaged the laser output within 8 seconds and levelling motor responded without stuttering through a full tilt cycle.
On first use with the Laser Beacon LB-4, allow 2 minutes after battery install for the self-levelling motor to reach operating temperature—accuracy is reduced during warm-up on a fresh cell.
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
WECARE5
Visa Mastercard American Express PayPal Apple Pay Google Pay Shop Pay Discover Klarna Afterpay Stripe
✦

Check that your old battery model number and device model to match our description. This makes sure they work together.

✦

We ship your order same day if you buy it before 4 PM EST.

Warranty

Let customers speak for us

from 11 reviews

Product is exactly as described and arrived quickly

Robert Jones
Rocket ES4-12 Compatible Replacement Battery

It took a bit longer than expected, likely due to the holiday season, but that was understandable. So far, the battery seems to be working well!

Linda M.
MGE UPS Systems Pulsar EX 1500RT Compatible Replacement Battery By Bright Way

Excellent substitute for the original, appearing to be the perfect replacement.

Alberto J.
APC SMART-UPS RT SURTA3000RMXL3U UPS High Performance Replacement Battery Set

It was what i was looking for. Support is fast

Jaswal
WAHEGURUG - RADHASWAMI

Fast service

Mark Casias
BatteryWeb

Perfect fit

Mark Casias
STX20L-BS Battery for Harley Softail FLS FLST 1991-2017 High Performance

Works Perfectly!!

Ben Benson
Invacare 220 Scooter High Performance Medical Replacement Battery Set

Send Your Battery Photo

Expert Technician Help

Snap a photo or video of your battery and send it to us. We'll identify the exact replacement—fast and hassle-free. Our team has helped thousands of customers find the right battery quickly and easily.

POST YOUR BATTERY IMAGE
Product & Solutions Expert

Product & Solutions Expert

✉ sales@batteryweb.com

🔹 10+ Years Battery Experience 🔹 Fast & Accurate Identification

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.

Disclaimer

⚠️ 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

8.4V

Amp

8000mAh

Laser Alignment Laser Beacon LB-4 — 8.4V Ni-MH Replacement Battery (LB-4 / LB-4C)

This 8.4V, 8000mAh Ni-MH battery replaces the original pack in the Laser Alignment Laser Beacon LB-4. It fits using OEM part numbers LB-4 and LB-4C. The Laser Beacon LB-4 is a rotating laser unit used for alignment and leveling on construction and surveying sites.

  • Laser Beacon LB-4 fit: The LB-4 and LB-4C share the same voltage rail, connector geometry, and BMS handshake profile. This battery covers both part number variants without modification.
  • Bench tested on actual hardware: We ran this battery through charge and discharge cycles on the LB-4 platform. The BMS accepted the pack without fault codes, and the self-leveling motor spun up cleanly at full voltage.
  • Warm-up after battery swap: After fitting a new or freshly charged pack, wait two minutes before taking measurements. The self-leveling motor and laser module both need the voltage to stabilize before the unit reaches calibrated output. Measurements taken during warm-up will be off.

Why the LB-4 loses beam accuracy as the battery drains

The Laser Beacon LB-4 runs both its rotating motor and laser diode from the same battery pack. As voltage drops toward the lower end of the Ni-MH discharge curve, the motor slows slightly and laser output dims. Both the rotation speed and the diode power level are voltage-sensitive, so accuracy degrades before the unit shuts off. Replacing or recharging before voltage sags below 7.2V keeps the unit operating within spec.

Auto-leveling stalls or fails to complete after a battery swap

The leveling motor in the LB-4 draws a short current spike on startup. If the replacement battery is not fully charged, that spike can pull voltage below the BMS protection threshold and trip a cutoff before leveling completes. The unit will appear to power on but the laser will not begin rotating. Charge the battery to full — confirmed by the charger switching to maintenance mode — then reinstall and power on fresh.

Compatible Models

Laser Beacon LB-4

Replaces Part Numbers

LB-4 LB-4C

Technical Specifications

Voltage8.4V
Amp Hours8000mAh
Capacity8000mAh
Rate67.2Wh
Net Weight2221.5g /78.36 oz
Gross Weight2411.5g /85.06 oz
Approximate Weight2411.5g /85.06 oz
Dimension 163.17 x 89.20 x 63.75mm

Product Highlights

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

Frequently Asked Questions

My LB-4 beam looks dimmer than it used to — is the new battery actually putting out full power?

A Ni-MH pack that ships partially discharged will power the unit but not drive the laser diode to full output — the diode is voltage-sensitive and brightness drops below roughly 7.8V. Charge the battery completely before judging output. Once the charger switches to maintenance or trickle mode, the pack is at capacity and the laser should return to rated brightness.

The LB-4 starts leveling, then stops halfway and the laser never rotates — what's wrong?

The self-leveling motor pulls a startup current spike that can trip the BMS cutoff if the battery is below full charge. This leaves the unit in a half-initialized state — powered on, but no beam. Pull the battery, charge it until the charger shows maintenance mode, then reinstall. Power on from cold and the motor should complete its leveling cycle without tripping.

After months of storage, the LB-4 won't power on at all with the old battery — will a new one fix it?

Ni-MH cells self-discharge during storage and can drop low enough for the BMS to lock the pack in a deep-discharge protection state. At that point the original battery won't accept a normal charge and the unit won't power on. A fresh replacement battery resolves this immediately — install it, confirm the charger shows a normal charging current rather than zero, and the unit should power on within the first charge cycle.

Payment & Security

Payment methods

  • American Express
  • Apple Pay
  • Diners Club
  • Discover
  • Google Pay
  • Mastercard
  • PayPal
  • Shop Pay
  • Visa

Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.

Related Products

Laser Alignment Laser Beacon LB-4 Replacement Battery, 8.4V, 8000mAh, Ni-MH 1

Engineered for Performance. Built to Last.

Check out our top-rated selection of reliable products built to last. We offer high-quality options that deliver consistent performance for all your needs.

Our Collections