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Topcon BT-68Q LS-B100 Replacement Battery 4.8V 2000mAh

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From $42.99 USD $52.99
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Fits Topcon LS-B100, LS-B110, LS-B110W laser levels; replaces OEM BT-68Q and GP180AAH4X6Z battery packs.
4.8V Ni-MH chemistry delivers 2000mAh capacity for sustained laser level operation on extended job sites without mid-session shutdowns.
Connector slides straight into the battery slot with positive contact first; locking tab secures pack flush against the instrument body.
We bench-tested this cell in the LS-B100 platform — BMS accepted the pack on first insertion with no reset cycle required.
After installation, power on the laser level and run the internal self-check routine before field deployment; Topcon instruments recalibrate battery voltage mapping during startup, skipping this step causes false low-battery warnings during your first measurement.
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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🔹 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

4.8V

Amp

2000mAh

Topcon LS-B100 Series — 4.8V Ni-MH Replacement Battery (BT-68Q)

This is a 4.8V, 2000mAh Ni-MH replacement for the Topcon BT-68Q battery pack. It fits the LS-B100, LS-B110, LS-B110W, and LS-B100 Machine Control Laser. Cell count, voltage rail, and connector match the original pack specification.

  • LS-B100 and LS-B110 series compatibility: These models share the same 4.8V four-cell Ni-MH architecture and BT-68Q connector pinout. The BMS expects identical cell impedance across all variants, so one pack covers the full range without modification.
  • Bench tested on actual hardware: We cycled this pack through power-on, laser activation, and sustained levelling loads. The BMS held stable across full discharge and did not trip during the motor-drive initialisation pulse at startup.
  • First-use calibration on the LS-B100: After installing, run a full calibration cycle through the instrument menu before field deployment. The LS-B100 maps battery state during calibration. Skipping this step causes premature low-battery warnings during your first measurement session — even with a fully charged pack.

LS-B100 shutting down mid-measurement despite showing adequate charge

Ni-MH cells develop internal resistance as they age, which causes voltage to sag sharply under the sustained draw of the laser diode and levelling motor running together. The instrument's undervoltage protection trips when pack voltage drops below the cutoff threshold — even briefly. A new pack with low internal resistance holds the voltage rail stable under that combined load. If shutdowns persist after fitting a new pack, check that the battery contacts in the instrument bay are clean and making full contact.

LS-B100 not recognising a new pack after the instrument sat unused for months

Ni-MH packs self-discharge during storage, and if the pack voltage drops far enough the instrument's battery detection circuit sees it as absent or faulty. The fix is to charge the pack fully before inserting it — do not install a pack straight from packaging into a stored instrument. After a full charge, insert the pack and power cycle the instrument. If the display still shows a fault, hold the power button for ten seconds to force a full BMS re-initialisation. The instrument should read normal battery status once pack voltage is above 4.6V at rest.

Compatible Models

LS-B100 LS-B110 LS-B110W LS-B100 Machine Control Laser LS-B110 Machine Control Laser

Replaces Part Numbers

BT-68Q GP180AAH4X6Z

Technical Specifications

Voltage4.8V
Amp Hours2000mAh
Capacity2000mAh
Rate9.6Wh
Net Weight300g /10.58 oz
Gross Weight350g /12.35 oz
Approximate Weight350g /12.35 oz
Dimension 52.30 x 28.90 x 15.00mm x 2

Product Highlights

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

Frequently Asked Questions

My Topcon LS-B100 powers on fine but shuts off the moment the laser activates — why?

Laser activation pulls a current spike that the degraded original pack cannot sustain — the voltage sags instantly below the undervoltage cutoff and the instrument shuts down as a protection response. This is a cell condition issue, not an instrument fault. Fitting a fresh pack with low internal resistance keeps the voltage rail above the trip threshold during that initial activation pulse. Confirm the replacement pack reads at least 4.8V on a multimeter before inserting it.

The LS-B100 display shows a different battery percentage every time I reboot — is the percentage reading accurate?

Ni-MH cells do not hold a stable open-circuit voltage curve, so the instrument estimates state-of-charge from voltage at startup rather than tracking actual capacity consumed. With a new pack, the instrument's voltage-to-percentage mapping recalibrates over the first two to three full charge-discharge cycles. Run two complete cycles — full charge, full discharge under normal field use — and the readout will settle to a consistent value. Do not trust the percentage on the first session after fitting a new pack.

The LS-B100 pack charges for a few minutes and then the charger indicates it is done, but the instrument dies quickly in the field — what is happening?

Aged Ni-MH cells trigger a false full-charge detection because the charger reads the voltage peak early due to elevated cell resistance, not because the pack is actually full. The pack accepts only a fraction of its rated 2000mAh before the charger terminates. Replace the pack and run the first charge on a slow or trickle-charge setting if your charger supports it — this avoids the premature termination that peak-detection circuits trigger on resistive cells. A healthy pack should feel slightly warm, not hot, at the end of charge.

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