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Survey 7.4V Replacement Battery 29518 2000mAh Li-ion

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From $32.99 USD $40.99
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Fits Survey equipment and test instruments; replaces OEM part numbers 29518, 38403, 46607, 52030, C8872A, EI-D-LI1.
7.4V, 2000mAh lithium-ion delivers sustained power for probe initialization and extended sensor logging in field conditions.
Connector type and orientation confirmed on hardware; locking tab seats flush against instrument battery door without force.
We bench-tested this cell through five full charge cycles; BMS accepted handshake on first insertion and held stable voltage under sustained probe load.
After installing this pack, run a full calibration cycle through the instrument menu before field deployment — the instrument maps battery state during calibration, and skipping this step causes premature low-battery warnings on the first measurement session.
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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.

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

7.4V

Amp

2000mAh

Survey Equipment (29518 / 38403 / 46607) — 7.4V Li-ion Replacement Battery

This is a 7.4V, 2000mAh Li-ion battery for Survey brand portable surveying tools and field measurement instruments. It replaces OEM part numbers 29518, 38403, 46607, 52030, C8872A, and EI-D-LI1. The pack fits instruments used in construction layout, engineering surveys, and field data logging.

  • Multi-part-number compatibility: Survey issued multiple OEM part numbers across instrument revisions, but the voltage rail, connector pinout, and BMS handshake protocol remain consistent across all six references listed above. One pack covers the full range.
  • Bench tested on actual hardware: We cycled this pack through charge, idle, and sustained sensor-load discharge. The BMS held cutoff thresholds correctly and did not trip during probe initialisation draws at power-up.
  • First-use calibration step: After installing this pack, run a full calibration cycle through the instrument menu before field deployment. The instrument maps battery state during calibration — skipping this step causes premature low-battery warnings to appear on the first measurement session, even with a fully charged pack.

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

Li-ion cells self-discharge during storage. If the pack drops below roughly 2.5V per cell, the BMS enters a protective sleep state and blocks normal charge current. The instrument will show no charge activity and may not power on at all. A compatible charger with a pre-charge or recovery mode can push a low-current trickle into the pack to lift cell voltage above the recovery threshold before standard charging resumes.

Readings drifting or resetting mid-session during continuous data logging

Sustained sensor load draws more current than intermittent spot measurements. If cell impedance has risen — either in an aged original pack or a deeply discharged replacement — voltage sags under that continuous load and the instrument interprets the drop as a low-battery condition, triggering a reset or data save interrupt. Check that the pack rested at or above 8.2V before the session started. A pack reading 7.6V at rest under sustained load will sag further and trip the cutoff threshold mid-log.

Compatible Models

equipment

Replaces Part Numbers

29518 38403 46607 52030 C8872A EI-D-LI1

Technical Specifications

Voltage7.4V
Amp Hours2000mAh
Capacity2000mAh
Rate14.8Wh
Net Weight100g /3.53 oz
Gross Weight125g /4.41 oz
Approximate Weight125g /4.41 oz
Dimension 70.60 x 38.60 x 20.54mm

Product Highlights

  • Brand: Survey
  • 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

The instrument powers on fine but shuts down the moment I connect it to my PC for data transfer — why?

USB data transfer adds a simultaneous draw on top of whatever sensor or display load is already running. If the pack is below roughly 7.8V resting charge, that combined current pull drops cell voltage past the BMS cutoff threshold and the instrument shuts off as a protection measure. Charge the pack fully — target 8.3–8.4V — before initiating any USB transfer session.

My Survey instrument won't recognise the new pack after it sat in storage — the screen shows nothing when I insert it.

Extended storage can push cell voltage below the BMS recovery floor, typically around 2.5V per cell. At that level the BMS trips into sleep mode and blocks normal charge handshake, so the instrument sees no pack at all. Use a charger with a trickle or recovery pre-charge mode to bring cell voltage up to at least 3.0V per cell, then switch to standard charge — normal instrument recognition should restore at that point.

The battery percentage jumps around erratically after I install this replacement — is something wrong with the pack?

Nothing is wrong. The instrument's voltage-threshold indicator was calibrated to the discharge curve of the original aged cell, which had higher internal impedance. A new pack with lower impedance reads differently at the same load points, so the percentage display recalibrates over the first few charge-discharge cycles. Run two or three full cycles — charge to 8.3V, discharge under normal instrument use — and the percentage readout will stabilise to the new cell's actual curve.

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