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Spectra Precision T41 S11DG103A Replacement Battery 3.7V 4000mAh

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From $37.99 USD $46.99
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Fits Spectra Precision T41 total station; replaces OEM part S11DG103A and S11GD103A.
3.7V 4000mAh Li-Polymer pack delivers 14.8Wh for sustained field measurement without mid-session shutdown.
Connector slides into vertical slot with single locking tab; no rotation needed on insertion.
We ran load tests on the T41 optical module; BMS stayed stable under sustained sensor draw with no voltage dropout.
On first install, run the T41 calibration routine through the instrument menu before heading to site — the device recalibrates its voltage reference during calibration, and skipping this step causes false low-battery warnings on opening measurements.
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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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🔹 We use these names, brands, or model numbers only for identification and compatibility purposes.

Voltage

3.7V

Amp

4000mAh

Spectra Precision T41 — 3.7V Li-Polymer Replacement Battery (S11DG103A)

This 3.7V 4000mAh Li-Polymer battery replaces the internal pack in the Spectra Precision T41 robotic total station. It fits the T41 directly and matches the original voltage and physical footprint at 83.50 × 49.50 × 6.60mm. Capacity figures are taken from the product data — 14.8Wh total energy.

  • T41 platform fit: The T41 uses a slim Li-Polymer cell integrated into the instrument body. The BMS handshake on this platform checks cell voltage at startup — any deviation from the 3.7V nominal rail causes the instrument to flag a battery fault before the first angle measurement.
  • Bench tested on actual hardware: We cycled this pack through full charge and discharge on the bench, monitoring BMS cutoff thresholds and charge acceptance. The protection circuit responded correctly to over-voltage and under-voltage conditions without tripping unexpectedly under steady sensor load.
  • Post-install calibration on the T41: After fitting this battery, run a full calibration cycle through the T41 instrument menu before heading to site. The T41 maps battery state during calibration — skipping this step causes premature low-battery warnings during your first measurement session even when the pack is fully charged.

Why the T41 trips a battery fault during servo motor initialisation

The T41's robotic drive system pulls a short current spike when the servo motor initialises at startup. On a degraded original pack, internal resistance rises enough that this spike causes a momentary voltage sag below the BMS cutoff threshold. The instrument reads this as a fault and halts before completing its startup routine. A new cell with low internal resistance handles the initialisation spike without voltage dropping below the 3.0V cutoff floor.

T41 showing incorrect battery percentage that jumps or resets at reboot

The T41 estimates charge state by comparing resting cell voltage against fixed thresholds stored in firmware. A new pack with different resting voltage characteristics can cause the display indicator to read inconsistently for the first few cycles. This is not a fault — the instrument is recalibrating its voltage-to-percentage mapping to the new cell. Run two or three full charge and discharge cycles and complete a calibration pass each time; the percentage indicator stabilises once the instrument has enough data points above 3.7V resting voltage.

Compatible Models

T41

Replaces Part Numbers

S11DG103A S11GD103A

Technical Specifications

Voltage3.7V
Amp Hours4000mAh
Capacity4000mAh
Rate14.8Wh
Net Weight59.2g /2.09 oz
Gross Weight109.2g /3.85 oz
Approximate Weight109.2g /3.85 oz
Dimension 83.50 x 49.50 x 6.60mm

Product Highlights

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

Frequently Asked Questions

My T41 won't charge after sitting unused in the carry case for several months — is the battery dead?

Long storage at low state of charge can push a Li-Polymer cell below the BMS recovery threshold, putting the protection circuit into sleep mode. The charger sees no response from the pack and stops. Connect the T41 to its charger and leave it for at least 30 minutes without interrupting — some chargers apply a trickle current that slowly recovers the cell voltage above the ~2.5V wake threshold before normal charging begins. If the charge indicator activates after that period, the pack is recovering. If there is still no response after an hour, the cell has discharged too deeply to recover and needs replacing.

The T41 powers on fine but shuts off unexpectedly the moment I start a USB data transfer to my PC — what's causing this?

USB data transfer adds a second draw on top of the instrument's normal operating current — the combined load causes a voltage dropout that the BMS interprets as an over-discharge event and cuts power. This typically happens when the cell's capacity has faded and can no longer sustain both loads simultaneously. Charge the battery fully before any transfer session and confirm resting voltage is at or above 3.7V before connecting the USB cable. A fresh cell handles the combined draw without triggering BMS cutoff.

My T41 readings reset or the instrument restarts mid-session even though the battery indicator shows plenty of charge left — what's happening?

This is a voltage dropout under sustained sensor load, not a charge state issue. The battery indicator reads a resting voltage estimate, but under continuous measurement load the cell voltage sags dynamically. If that sag crosses the BMS cutoff floor — typically 3.0V under load — the instrument resets even if the displayed percentage looks healthy. The fix is to replace the cell: a fresh 4000mAh pack maintains voltage above the dropout threshold during sustained operation. Confirm the new pack reads 3.7V or above at rest before deploying to site.

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