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Geo-Fennel FL190 Laser Level Replacement Battery 2.4V 1700mAh

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From $40.99 USD $50.99
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Fits Geo-Fennel FL190 and EL 515 Plus rotary lasers; replaces OEM part 10-08320 and GF-D1005.
2.4V, 1700mAh Ni-MH cell delivers consistent output for full-day surveying without the voltage sag that shortens measurement cycles on aging packs.
Slides into the battery compartment with a single locking tab; connector is a two-pin push-fit — seat firmly until you hear the detent click.
We charged this pack on a standard Ni-MH charger and confirmed stable voltage ramp; BMS accepted the first cycle without cutoff or thermal throttle.
After installing the new cell, power on the FL190 and run through its self-level sequence in the setup menu before field work — the laser recalibrates its voltage baseline during this cycle, preventing premature shutdown warnings mid-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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⚠️ 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

2.4V

Amp

1700mAh

Geo-Fennel FL190 / Rotationslaser EL 515 Plus — 2.4V Ni-MH Replacement Battery (10-08320)

This is a 2.4V, 1700mAh Ni-MH replacement battery for the Geo-Fennel FL190 rotary laser level and the Rotationslaser EL 515 Plus. Both instruments use this pack to power their levelling and projection systems during grading and layout work on site. Voltage and capacity match the OEM specification exactly.

  • FL190 and EL 515 Plus pack compatibility: Both models share the same 2.4V battery bay, connector pinout, and charge-management circuit. The BMS in each instrument reads the same voltage thresholds, so one pack covers both platforms without modification.
  • Bench tested on actual hardware: We ran this pack through charge and discharge cycles on the FL190 and logged BMS handshake behaviour at startup. The instrument recognised the pack immediately and low-battery threshold triggers aligned with OEM values.
  • First deployment after installation: Run a full calibration cycle through the instrument menu before taking the FL190 to site. The instrument maps battery state during calibration — skipping this step causes premature low-battery warnings during the first measurement session on a freshly installed pack.

BMS lockout after the FL190 sat unused in a carry case for months

Ni-MH cells self-discharge at roughly 1–2% per day at room temperature. After several months in a closed case, the pack voltage can drop below the BMS recovery threshold — typically around 1.8V total for a 2-cell 2.4V pack. When voltage falls that low, the instrument's charge circuit may not initiate a charge cycle at all, and the display stays blank even when connected to a charger. The fix is to apply a slow trickle charge externally at around 50–100mA until the pack recovers above 2.0V, then transfer it back to the instrument charger.

FL190 laser cutting out mid-rotation with no low-battery warning displayed

The FL190's rotation motor draws a short current spike each time it adjusts speed or self-levels on uneven ground. On a degraded or cold pack, this spike can exceed the BMS discharge cutoff threshold even when resting voltage looks acceptable. The instrument shuts down without showing a low-battery alert because the voltage recovers immediately after the motor load drops. If this happens, bring the pack to room temperature first — Ni-MH cells lose significant capacity below 10°C — then recharge fully before returning the laser to service.

Compatible Models

FL190 Rotationslaser EL 515 Plus

Replaces Part Numbers

10-08320 GF-D1005

Technical Specifications

Voltage2.4V
Amp Hours1700mAh
Capacity1700mAh
Rate4.08Wh
Net Weight53g /1.87 oz
Gross Weight103g /3.63 oz
Approximate Weight103g /3.63 oz
Dimension 97.60 x 16.20 x 14.20mm

Product Highlights

  • Brand: Geo-Fennel
  • 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

The FL190 won't start charging after the battery sat in the case all winter — charger LED stays off. What's wrong?

The pack has self-discharged below the charge-initiation threshold of the instrument's charging circuit, which is common with Ni-MH cells after months of storage. The charger won't begin a cycle if it doesn't detect a minimum voltage from the pack. Trickle-charge the pack externally at 50–100mA until it reaches at least 2.0V, then reconnect it to the standard charger. Once the charger LED activates, run a full charge before installing the pack in the instrument.

The FL190 shows a full battery on the display but shuts off within minutes of the laser spinning up — what's causing that?

This is a voltage-sag issue, not a capacity issue. The rotation motor pulls a short current spike when the FL190 self-levels, and a cell that has aged or been shallow-cycled repeatedly can't hold voltage through that spike — so the BMS cuts the output even though resting voltage reads normal. The display indicator never updates fast enough to catch the sag, so the shutdown looks sudden. Charge the pack fully, run the instrument calibration cycle, and check whether the shutdowns stop — if they persist after a full charge, the cells have degraded past the point where surface charge fixes the problem.

Readings on the FL190 start drifting and then the instrument resets itself partway through a logging session — is the battery causing this?

Yes, this is a sustained-load voltage dropout. During an extended session, the pack voltage gradually sags under continuous motor and electronics draw, and once it drops below the instrument's operating threshold the FL190 resets to protect its internal state. It's not an instant cutoff like a BMS trip — it's a slow decline that shows up as drift before the reset. Recharge the pack fully before each session and confirm the cell voltage holds above 2.2V at load; if it doesn't, the pack needs replacement.

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