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Sokkia BDC46 SET 200 Replacement Battery 7.4V 3400mAh

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From $36.99 USD $45.99
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Replaces Sokkia BDC46, BDC46A, BDC46B, BDC46C, SDL30 battery packs for SET 200 and SCT6 total stations.
7.4V, 3400mAh capacity delivers sustained power for angle and distance measurements across full survey sessions.
Connector slides into the battery door slot with positive contact facing the instrument terminal block; locking tab seats flush against the housing.
We bench tested this cell against an SDL30 pack; BMS voltage regulation stayed flat under sensor load without dropout spikes.
After installation, run a full calibration cycle through the instrument menu before field deployment — the SET 200 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

3400mAh

Sokkia SET 200 / SDL30 Total Station — 7.4V Li-ion Replacement Battery (BDC46)

This 7.4V, 3400mAh Li-ion battery replaces the BDC46 and BDC46A packs used in the Sokkia SET 200 and SDL30 total stations. It fits the instrument's battery bay and connects to the onboard BMS via the same three-pin interface as the original. Voltage and capacity match the factory spec exactly.

  • SET 200, SCT6, SDL30, and SDL50 compatibility: These models share the same battery bay geometry, connector pinout, and BMS handshake protocol. One pack services all of them without modification.
  • Bench tested on actual hardware: We ran this cell under load cycles that simulate motor drive, angle measurement, and EDM ranging. The BMS held voltage within the instrument's operating window throughout and did not trip during the current spike at EDM initialisation.
  • Post-install calibration step: After installing this pack, run a full calibration cycle through the instrument menu before field deployment. The SET 200 maps battery state during calibration. Skipping this step causes premature low-battery warnings on your first measurement session even when the pack is full.

BMS lockout after the SET 200 sat unused in a carry case for months

Li-ion cells self-discharge during storage. If a pack drops below roughly 2.5V per cell, the BMS trips a deep-discharge lockout and the instrument will not power on at all — not even briefly. The charger may also fail to initiate a charge cycle because the pack voltage is below the charger's detection threshold. To recover, place the battery on a compatible Li-ion charger that supports a pre-charge or recovery mode; some chargers will slowly trickle current at low voltage until the cells reach the standard charge threshold of around 3.0V per cell, at which point normal charging resumes.

SET 200 shuts down mid-measurement with no low-battery warning

This is a voltage sag issue, not a capacity issue. Under sustained EDM ranging or continuous motor drive, current draw spikes and cell voltage temporarily drops below the instrument's cutoff threshold — even if the displayed battery indicator showed plenty of charge moments before. An aged cell has higher internal resistance, which amplifies the voltage sag under load. Check resting voltage after a shutdown: if it reads above 7.0V at rest but the instrument cuts out under load, internal resistance is the cause, and the cell needs replacement rather than recharging.

Compatible Models

SET 200 SCT6 total Stations SDL30 SDL50 GIR1600 GPS Receiver SET300 SET500 SET530 SET600 SET630 SHC-336 SHC-336 data collector SET 230R SET 330R SET 530R SET 630R SET 230R3 SET 330R3 SET 530R3 SET 230RK SET 330RK SET 530RK SET 630RK SET 230RK3 SET 330RK3 SET 530RK3 SET 210 SET 210K SET 310K SET 510K SET 610K MONMOS NET1 200 3D STATIONS STRATUS L1 GPS 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 SET 300 SET 500 SET 600 SET 310 SET 510 SET 610 SET 330 SET 530 SET 630 DL30 RCP4-5 Controlers GRS1700 CSX SET200 SET250RX a SET300 SET350RX SET550RX SET650RX SCT6 SDL30 Digital Level SDL30M Digital Level SDL50 Digital Level LDT520 Laser Digital Theodolite GIR1600 DGPS Receiver GM52-S GRS-1 GRS-1 Mobile GIS Mapping System SET 500S SET500S

Replaces Part Numbers

BDC46 BDC46A 7380-46 SDL30 40200040 BDC-46 BDC-46A BDC-46B BDC46B BDC-46C

Technical Specifications

Voltage7.4V
Amp Hours3400mAh
Capacity3400mAh
Rate25.16Wh
Net Weight103g /3.63 oz
Gross Weight143.5g /5.06 oz
Approximate Weight143.5g /5.06 oz
Dimension 70.50 x 38.30 x 20.10mm

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 Sokkia SET 200 powers on fine but shuts off the moment I start an EDM distance measurement — what's causing that?

The EDM module draws a sharp current spike at initialisation, and an aged or partially discharged cell cannot hold voltage through it — the pack sags below the instrument's cutoff and the unit shuts off. This happens even when the battery indicator looked healthy before you triggered the measurement. Check resting voltage with a multimeter: a good cell reads 7.4–8.2V at rest. If it reads in that range but the instrument still cuts out under EDM load, the cell's internal resistance is too high and replacement is the fix.

My SET 200 won't recognise the new battery after the instrument sat unused all winter — the screen stays blank even on the charger.

Extended storage drops cell voltage below the BMS recovery threshold, typically below 5.0V for a 7.4V pack, and the BMS enters a lockout state. Most standard chargers won't initiate a charge cycle at that voltage. Use a Li-ion charger with a pre-charge or recovery mode — it will push a low trickle current until each cell climbs back above 3.0V, then switch to normal CC/CV charging. Once the pack reaches around 6.0V, the BMS resets and the instrument should recognise it.

My SET 200 shows a stable battery percentage at startup but the reading resets or jumps mid-session during data logging — is this a battery fault?

Yes — this points to a voltage dropout under sustained sensor load during the logging session. When the instrument is actively logging and driving the display simultaneously, current draw is higher than at idle, and a cell with reduced capacity cannot hold a stable voltage through that combined load. The instrument's indicator then recalculates state-of-charge against the new voltage, causing the visible jump or reset. Confirm by checking the pack voltage immediately after a dropout event — a reading below 7.0V under light load confirms the cell can no longer support the instrument's sustained draw.

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