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Martel BP-33 BetaGauge 330 Replacement Battery 9.6V

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Fits Martel BetaGauge 330 radiation survey instruments; replaces OEM part numbers BP-33, 85804, and DC16.
9.6V and 2000mAh capacity delivers stable power through extended contamination surveys without mid-session voltage sag.
Connector slides straight into the battery compartment with a single locking tab on the rear face.
We bench-tested this pack against the stock BP-33 under sustained probe load; BMS held voltage steady through full detection cycles.
After installation, run the instrument's calibration routine from the main menu before field deployment — this ensures the detector initializes the battery state correctly and prevents premature low-battery warnings during your 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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🔹 We use these names, brands, or model numbers only for identification and compatibility purposes.

Voltage

9.6V

Amp

2000mAh

Martel BetaGauge 330 — 9.6V Ni-MH Replacement Battery (BP-33)

This 9.6V, 2000mAh Ni-MH battery replaces the OEM BP-33 pack in the Martel BetaGauge 330 portable radiation survey instrument. It powers the detection, measurement, and display functions during field contamination surveys and radiation safety assessments. Capacity is rated at 19.2Wh and dimensions match the original bay at 56.35 × 50.14 × 28.64mm.

  • BetaGauge 330 platform fit: The BP-33 form factor is specific to this instrument's battery bay. Voltage rail, connector orientation, and cell count are fixed to the 330's power circuit — there is no cross-compatibility with other BetaGauge variants that run different voltage rails.
  • Bench tested on actual hardware: We cycled this pack through the BetaGauge 330's charge and discharge sequence. The BMS held stable through probe initialisation current spikes and sustained sensor load without tripping into protection cutoff.
  • First-session calibration step: After installing this pack, run a full calibration cycle through the BetaGauge 330 instrument menu before field deployment. The instrument maps battery state during that calibration pass — skipping it causes premature low-battery warnings during your first measurement session, even with a fully charged pack.

BMS lockout after the BetaGauge 330 sat unused in a carry case for months

Ni-MH cells self-discharge at roughly 1–2% per day at room temperature. A pack left in storage for several months can drop below the BMS recovery threshold — typically around 8.0V for a 9.6V eight-cell pack. When voltage falls that low, the BMS enters a sleep state and the instrument shows no response or a charging fault. To recover, connect the charger and leave it for a full charge cycle without interruption; most BMS circuits re-initialise once they detect charge current above the wake threshold, around 8.4–8.8V.

BetaGauge 330 readings resetting or dropping mid-logging session

This is a voltage dropout symptom, not a measurement error. Under sustained sensor load — particularly when the detector circuit is actively counting — current draw rises and cell voltage sags momentarily below the instrument's operating floor. If the pack's cells have aged or been deeply discharged, that sag crosses the reset threshold and the instrument restarts mid-session. A fresh, fully charged replacement pack holds the voltage rail above 9.0V under load, which is the operating floor for stable logging on the 330.

Compatible Models

BetaGauge 330

Replaces Part Numbers

BP-33 85804 DC16

Technical Specifications

Voltage9.6V
Amp Hours2000mAh
Capacity2000mAh
Rate19.2Wh
Net Weight211.2g /7.45 oz
Gross Weight281.2g /9.92 oz
Approximate Weight281.2g /9.92 oz
Dimension 56.35 x 50.14 x 28.64mm

Product Highlights

  • Brand: Martel
  • Manufacturer: CS
  • Series: Standard
  • Color: Black
  • Product Type: Ni-MH
  • Battery Type: Ni-MH
  • Warranty: 12 Months
  • Bulk Orders: sales@batteryweb.com

Frequently Asked Questions

The BetaGauge 330 shuts off the moment the detector probe initialises — the battery shows full before that point. What's happening?

Probe initialisation pulls a short current spike that a degraded or partially discharged pack cannot sustain without sagging below the instrument's cutoff voltage. The BMS interprets that sag as an unsafe discharge event and trips into protection mode. This is a cell-condition issue, not a charger issue. Fit a fresh pack, charge it fully to 9.6V, then power on — the spike at probe start-up will clear without tripping the BMS.

The pack won't take a charge after sitting in the case for months — the charger light just blinks or shows a fault. How do I recover it?

Extended storage drops Ni-MH cells below the BMS wake threshold, which causes the charger to detect an abnormal voltage and refuse to begin a normal charge cycle. Some chargers have a recovery or trickle mode that applies a low current (around 50–100mA) to bring the pack back above 8.4V before switching to full charge. If your charger has that mode, activate it. If not, the cells have likely self-discharged past safe recovery — replace the pack rather than force-charging a cell stack that reads below 7.5V.

The BetaGauge 330 powers on fine but shuts down during USB data transfer to a PC. Is this a battery problem?

Yes — USB data transfer adds a second current draw on top of the active detector circuit. The combined load pulls pack voltage below the instrument's operating floor, triggering a shutdown. This happens most often with a pack that is below 50% charge or has degraded capacity. Charge the pack fully before any transfer session and confirm terminal voltage is at or above 9.4V before connecting the USB cable.

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