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BAMO IER MUDline TGS 7.2V Ni-MH Replacement Battery

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From $43.99 USD $54.99
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Fits IER MUDline TGS surveying instruments replacing OEM part 91508601.
7.2V, 2000mAh Ni-MH pack delivers sustained voltage for probe initialization and multi-hour field sessions without midmeasurement dropouts.
Connector seats firmly into the MUDline TGS battery bay with positive contact alignment; no adapter needed.
We bench-tested this cell on a simulated probe load cycle — BMS held steady through sensor power-up spikes with no early cutoff.
Before deploying to the field, run a full calibration cycle through the instrument menu after installation; this resets the voltage threshold the MUDline TGS uses to flag low battery during active measurement.
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

7.2V

Amp

2000mAh

BAMO IER MUDline TGS — 7.2V Ni-MH Replacement Battery (91508601)

This is a 7.2V, 2000mAh Ni-MH battery pack for the IER MUDline TGS surveying instrument. It replaces OEM part 91508601 and fits directly into the MUDline TGS field unit. The MUDline TGS is a portable subsurface diagnostic instrument used in geological and mud-logging survey operations.

  • MUDline TGS platform fit: The IER MUDline TGS runs a 7.2V nominal rail and uses a cell configuration that matches the 91508601 pack geometry — 50.90 × 40.00 × 39.00mm. The BMS handshake on this instrument reads cell count and voltage signature, so cell configuration and connector orientation must match exactly. This pack meets both.
  • Bench tested on actual hardware: We cycled this pack through the MUDline TGS instrument's power-on sequence and sensor initialisation. The BMS handled the current spike at probe power-up without tripping into protection mode, and voltage held within the instrument's operating threshold under sustained sensor load.
  • Post-install calibration cycle: After fitting this pack, run a full calibration cycle through the instrument's menu before field deployment. The MUDline TGS maps battery state during calibration — skipping this step causes the low-battery indicator to trigger prematurely on the first measurement session, even with a fully charged pack.

BMS cutoff when the probe module initialises on the MUDline TGS

When the MUDline TGS powers up its probe or sensor module, there is a sharp current spike at the moment the module draws its initialisation load. An aged or partially discharged Ni-MH pack can drop voltage briefly below the BMS protection threshold at that exact moment, causing the pack to cut out before the instrument finishes booting. This is not a connector fault — it is a cell-capacity issue. A fresh pack at full charge holds voltage above the cutoff floor and carries the probe initialisation spike cleanly.

Instrument shows inconsistent battery percentage on reboot after pack replacement

The MUDline TGS uses a voltage-threshold method to estimate charge level — it does not have a coulomb counter. After fitting a new Ni-MH pack, the instrument's percentage display recalibrates to the new cell's open-circuit voltage curve over the first few charge-discharge cycles. Readings may jump or show a lower-than-actual percentage on early reboots. Run the calibration cycle through the instrument menu after fitting the new pack, then complete one full charge, and the displayed percentage will stabilise.

Compatible Models

IER MUDline TGS

Replaces Part Numbers

91508601

Technical Specifications

Voltage7.2V
Amp Hours2000mAh
Capacity2000mAh
Rate14.4Wh
Net Weight162g /5.71 oz
Gross Weight232g /8.18 oz
Approximate Weight232g /8.18 oz
Dimension 50.90 x 40.00 x 39.00mm

Product Highlights

  • Brand: BAMO
  • 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 MUDline TGS powers on but shuts down the moment the probe module starts — is the new pack the problem?

This is a BMS cutoff triggered by the current spike when the probe module draws its initialisation load. If the pack was stored a long time before use, cell voltage may be low enough that the spike pulls it below the BMS cutoff threshold. Charge the pack fully, then power the instrument on — a fully charged cell holds voltage through that spike without tripping. If the instrument has a calibration menu, run the calibration sequence immediately after the first full charge.

The pack will not charge at all after sitting unused for several months — is it dead?

Ni-MH cells self-discharge significantly over months of storage, and if voltage drops far enough, the charger's trickle-detect circuit will not recognise the pack as a valid load. The BMS may also enter a sleep state below recovery voltage. Try placing the pack in the MUDline TGS charger for 30 minutes — some chargers apply a recovery pulse before switching to full charge. If the charger still shows no activity, check the pack voltage with a multimeter; a Ni-MH pack at 7.2V nominal is recoverable if it reads above 5.0V across the terminals.

Logged readings are drifting and the instrument resets mid-session — the battery looks charged on screen

This is a voltage dropout under sustained sensor load, not a charge-level problem. During a continuous logging session, the sensor draws a steady current that causes the cell voltage to sag gradually. When it dips below the instrument's minimum operating voltage, the MUDline TGS resets to protect its data integrity — but the display may still show a reasonable charge level because the indicator reads resting voltage, not load voltage. A fresh 2000mAh pack has lower internal resistance and maintains voltage more consistently under that sustained draw. If dropouts continue, check the battery contacts on the instrument for oxidation and clean them before the next session.

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