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Clarke-Tech CT-MT1 11.1V Survey Replacement Battery 2600mAh

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From $36.99 USD $45.99
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Fits Clarke-Tech CT Triple survey instruments; replaces OEM battery CT-MT1.
11.1V and 2600mAh capacity delivers full power to probe initialization and sustained sensor logging without mid-session voltage sag.
Connector slides straight into the battery slot with a single locking tab; no adapter needed for CT Triple models.
We bench-tested this pack on probe sensor startup — the BMS handled the initial current spike without cutoff, then held steady voltage through a full logging cycle.
After installing, run a complete calibration cycle through the instrument menu before field deployment — the CT Triple 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.

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.

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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

11.1V

Amp

2600mAh

Clarke-Tech CT Triple — 11.1V Li-ion Replacement Battery (CT-MT1)

This is an 11.1V 2600mAh Li-ion replacement battery for the Clarke-Tech CT Triple survey and testing instrument. It replaces OEM part CT-MT1 and restores full operation to the CT Triple for field measurement and diagnostic work. Voltage and capacity match the original pack exactly.

  • CT Triple compatibility: The CT Triple draws power through a fixed voltage rail at 11.1V nominal. The CT-MT1 pack includes a BMS that matches the instrument's charge termination and discharge cutoff thresholds — a mismatched BMS handshake causes the instrument to flag a battery fault before the cells are depleted.
  • Bench tested on actual hardware: We ran this pack through charge and discharge cycles simulating probe initialisation loads. The BMS held stable through repeated sensor power-up current spikes without tripping into protection mode.
  • First-use calibration on the CT Triple: After installing this pack, run a full calibration cycle through the CT Triple's instrument menu before heading out. The instrument maps battery state during that calibration sequence. Skip it and the battery indicator will throw premature low-battery warnings on your first measurement session.

BMS lockout after the CT Triple sat unused in a carry case for months

Li-ion cells self-discharge over time. If the CT Triple sits unused long enough, the pack voltage can drop below the BMS recovery threshold — typically around 2.5V per cell, or roughly 7.5V for a 3S pack like this one. At that point the BMS enters a hard lockout and the instrument will not power on, even connected to a charger. Use a compatible Li-ion charger that supports a low-voltage recovery or pre-charge mode to bring the pack back above the recovery threshold, then charge normally.

CT Triple shuts down mid-measurement during a logging session

Sustained sensor load draws more current than standby operation, and an ageing or partially depleted cell will sag in voltage under that load even if the display showed adequate charge at startup. When cell voltage sags below the BMS cutoff — typically 3.0V per cell — the pack disconnects and the instrument shuts off, losing the active log. A new pack at full charge holds voltage more firmly under load. Before a long logging session, confirm the pack reads at or above 12.0V on a multimeter at the battery terminals before installing it.

Compatible Models

CT Triple

Replaces Part Numbers

CT-MT1

Technical Specifications

Voltage11.1V
Amp Hours2600mAh
Capacity2600mAh
Rate28.86Wh
Net Weight141.6g /4.99 oz
Gross Weight166.6g /5.88 oz
Approximate Weight166.6g /5.88 oz
Dimension 68.50 x 57.00 x 18.80mm

Product Highlights

  • Brand: Clarke-Tech
  • Manufacturer: CS
  • Series: Standard
  • Color: Blue
  • Product Type: Li-ion
  • Battery Type: Li-ion
  • Warranty: 12 Months
  • Bulk Orders: sales@batteryweb.com

Frequently Asked Questions

The CT Triple powers on fine but shuts itself off the moment the probe initialises — why?

Probe initialisation pulls a short current spike that can exceed the BMS overcurrent threshold if the pack voltage is already slightly low or the cells are stressed. The BMS trips into protection mode and disconnects, cutting the instrument off instantly. This is not a fault in the instrument — it is the BMS doing its job with a pack that cannot deliver the peak current cleanly. Charge the replacement pack fully before first use and confirm terminal voltage reads at least 12.3V before installation.

The CT Triple won't charge at all after sitting in storage for several months — is the battery dead?

Not necessarily. Deep self-discharge can push individual cell voltage below the BMS recovery threshold, and most chargers will refuse to charge a pack in that state. Connect the pack to a Li-ion charger with a pre-charge or recovery mode that applies a low trickle current below 0.1C until cell voltage climbs back above 3.0V per cell. Once all three cells are above that floor, the BMS re-enables normal charging. If the pack does not respond after 30 minutes of recovery charging, the cells have likely degraded past recovery.

Readings on the CT Triple reset or jump unexpectedly partway through a measurement session — could this be the battery?

Yes. A voltage dropout under sustained sensor load — even a brief dip — can cause the CT Triple's processor to reset or lose the measurement state without fully powering off. The display may show normal charge level before and after because the sag is momentary. Check the pack under load by measuring terminal voltage while the instrument is actively logging; a healthy pack should hold above 10.8V. If voltage dips below that during operation, the pack cannot sustain the load and needs replacing.

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