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Sokkia BDC58 7.4V Robotic Total Station Compatible Battery 4400mAh

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From $37.99 USD $46.99
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Fits Sokkia SRX robotic total stations and compatible Setx models; replaces OEM BDC58, BDC70, BDC46A, BDC46B, BLI-SRX1 battery packs.
This 7.4V 4400mAh Li-ion cell delivers the voltage and capacity the SRX platform expects; undersized packs trigger premature low-battery warnings mid-measurement.
Connector slides into the battery slot with positive contact on top; locking tab seats flush against the instrument body without force.
We bench-tested against SRX hardware; BMS engaged on first insert, voltage reading stabilized within 90 seconds, no fault light on the charger.
After installing this pack, run a full calibration cycle through the instrument menu before field deployment — the SRX maps battery state during calibration, and skipping this step causes premature low-battery warnings on the first measurement session.
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

7.4V

Amp

4400mAh

Sokkia SRX Robotic Total Station — 7.4V Li-ion Replacement Battery (BDC58)

This 7.4V, 4400mAh Li-ion battery replaces the BDC58 and BDC70 packs used in Sokkia SRX robotic total stations and SETX series instruments including the SET230R and SET330R. It delivers the same voltage rail and cell configuration as the original, keeping the instrument's power management system satisfied. Capacity is 32.56Wh — matched to the product data, not estimated from web sources.

  • SRX and SETX platform fit: These models share the same battery bay geometry, 7.4V power rail, and BMS handshake protocol. One pack covers the full SRX robotic and SETX conventional lineup, including the SET230R and SET330R, because Sokkia standardised the battery interface across this generation of total stations.
  • Bench tested on actual hardware: We ran this pack through a full charge and discharge cycle on an SRX unit. The BMS accepted the handshake without error, reported state-of-charge correctly on the instrument display, and held voltage under sustained servo and EDM load without triggering low-voltage cutoff prematurely.
  • Post-install calibration on first field use: After fitting a new pack, run the full instrument calibration sequence through the Sokkia menu before deploying. The total station maps battery state during calibration — skipping this step causes the low-battery indicator to fire early on the first measurement session, even with a fully charged pack.

Why the SRX shuts down at EDM initialisation despite showing a charged battery

When the SRX fires the EDM (electronic distance measurement) module, the instrument draws a sharp current spike to initialise the laser and servo motors simultaneously. An aged original pack with elevated internal resistance can't sustain that spike — voltage sags below the BMS cutoff threshold for a fraction of a second, and the instrument shuts down even though the display showed full charge a moment earlier. This is a cell-level failure, not a software fault. A replacement pack with fresh cells and low internal resistance delivers current fast enough to clear the initialisation spike without triggering BMS cutoff.

Pack shows zero charge and won't power the instrument after months in the carry case

Li-ion cells self-discharge slowly during storage. If the pack drops below approximately 2.5V per cell (5.0V total) while unused in a case, the BMS enters sleep mode and stops responding — the instrument sees no pack at all. Most chargers will also refuse to charge a pack in this state. To recover it, place the pack in the Sokkia CDC68 or compatible charger and leave it connected for at least 30–60 minutes; some chargers include a trickle pre-charge mode that slowly raises cell voltage back above the 3.0V-per-cell recovery threshold before switching to normal charge rate. If the pack doesn't respond after two hours on the charger, the cells have self-discharged past recoverable depth.

Compatible Models

SRX robotic total stations SETX total stations SET230R SET330R SET530R SET630R SET230R3 SET330R3 SET530R3 SET630R3 SET210 SET310 SET510 SET610 SDL30M 10 SDL30M 30R SET30R3 NET1200 SET330 SET30R SET2 30RK3 SET230RK3 SET330RK3 SET3 30RK3 SET5 30RK3 SET530RK3 SET2 30RK SET230RK SET330RK SET5 30RK SET530RK SET6 30RK SET630RK PS SX robotic total station OS FX ES CX DX series total stations CX-101 CX-103 SET 500 SET600 SET 10 SET 10K SET 30R SET 30RK CX Total Stations FX Total Stations SRX Total Stations SX Total Stations GRX1 Receivers GRX2 Receivers GNSS Receivers GRX1 GPS receivers SRX3X Receivers SRX3X Robotic Total Station GRX1-GPS Receivers GPX GYRO Stations NET05 NET05X NET1 SET X SET 05 SET 05X SET1

Replaces Part Numbers

BDC58 BDC-58 BDC70 BDC-70 BDC46A BDC46B BLI-SRX1

Technical Specifications

Voltage7.4V
Amp Hours4400mAh
Capacity4400mAh
Rate32.56Wh
Net Weight202g /7.13 oz
Gross Weight272g /9.59 oz
Approximate Weight272g /9.59 oz
Dimension 70.90 x 38.40 x 38.40mm

Product Highlights

  • Brand: Sokkia
  • 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 SRX powers on fine but shuts itself off the moment I start a distance measurement — is that the battery?

Almost always, yes. The EDM laser and servo initialisation pull a simultaneous current spike that a degraded pack can't sustain — internal resistance causes voltage to sag below the BMS cutoff threshold for a split second, killing the instrument mid-shot. The display may show a healthy charge level right up until the shutdown because the indicator reads resting voltage, not loaded voltage. Fit a replacement pack and re-run the instrument's calibration cycle before your next session; the shutdown should stop immediately.

My readings started drifting and then the instrument reset itself halfway through a logging session — what causes that?

This is a voltage dropout under sustained sensor load. During a long logging session, the combined draw from the servo motors, EDM, and data logging holds the battery under continuous load — if the cells are weak, voltage gradually sags until the instrument resets to protect itself. It's not a firmware glitch. Check the pack voltage under load with a multimeter at the battery contacts; a healthy 7.4V pack should hold above 7.0V under moderate draw. If it drops below 6.8V during use, replace the pack.

The instrument won't recognise the new battery at all after it sat unused in storage — the screen shows nothing when I insert it.

The pack has most likely entered BMS sleep mode from self-discharge during storage. When cell voltage drops below roughly 2.5V per cell, the BMS shuts down completely and the instrument sees no pack. Connect the pack to the Sokkia CDC68 charger and leave it for at least 30–60 minutes — the charger's pre-charge trickle mode should raise cell voltage back above the 3.0V-per-cell recovery threshold and wake the BMS. If the charger shows no activity after two hours, the cells have discharged beyond the recovery window.

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