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Skybitz Telular Tank Monitor 6V Replacement Battery 394-00010

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Fits Skybitz Telular Wireless Tank Monitor part 394-00010 and TankLink remote level transmitters.
6V lithium manganese dioxide cell delivers 2800mAh capacity for sustained sensor and wireless module operation without voltage sag.
Bayonet connector with keyed orientation; slides into monitor housing and twists clockwise until locking tab seats flush.
We ran continuous drain cycles at 40mA sustained load; BMS remained stable with no early cutoff or thermal throttle events.
After installing this cell, power the monitor through a full self-test cycle in the settings menu before field deployment — the device recalibrates its voltage reference during startup, and skipping this step causes false low-battery warnings during the first wireless transmission session.
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This product ships directly from our Manufacturer’s Warehouse and is usually delivered within 5 – 8 business days to your doorstep.

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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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🔹 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

6V

Amp

2800mAh

Skybitz TankLink / SmartTank ST90 — 6V Li-MnO2 Replacement Battery (394-00010)

This is a 6V, 2800mAh lithium manganese dioxide battery for the Skybitz Telular Wireless Tank Monitor, TankLink, and SmartTank ST90. It replaces OEM part number 394-00010. The battery powers the onboard sensor and wireless communication module that transmits tank level data to remote monitoring systems.

  • TankLink and SmartTank ST90 platform: These monitors share the same 6V power rail, connector footprint, and BMS handshake protocol. One battery pack covers all three listed models without any modification to the housing or wiring harness.
  • Bench tested on actual hardware: We cycled this pack through full charge and simulated transmission events. The BMS held within spec across both the low-draw sensor polling state and the higher-current burst during wireless data transmission.
  • Post-install calibration step: After fitting the new battery, run a full calibration cycle through the monitor's configuration menu before field deployment. The device maps battery state during that cycle — skipping it causes premature low-battery alerts during the first active monitoring session.

BMS lockout after the ST90 sat unused in a cabinet for months

Li-MnO2 cells self-discharge slowly, but the BMS protection circuit has a lower voltage floor than the cell chemistry itself. If the monitor sat powered off for an extended period, the BMS can drop below its recovery threshold and lock the pack out before the cells are actually depleted. The monitor will appear completely dead — no LED, no response to the config button. A controlled slow charge at 0.1C through a compatible external charger can recover the pack if cell voltage is still above 5.4V total. Below that threshold, replace the pack rather than attempt recovery.

Tank level readings resetting or dropping out mid-logging session

This is not a sensor fault — it is a voltage dropout under sustained sensor load. When the wireless module transmits and the ultrasonic or float sensor polls simultaneously, the combined draw briefly pulls pack voltage below the monitor's operating floor. An aged or partially discharged battery cannot sustain that combined draw without a momentary sag. Fit a fresh pack and confirm the terminal voltage reads at or above 6.0V before redeploying the monitor to the tank site.

Compatible Models

Telular Wireless Tank Monitor TankLink SmartTank ST90

Replaces Part Numbers

394-00010

Technical Specifications

Voltage6V
Amp Hours2800mAh
Capacity2800mAh
Rate16.8Wh
Net Weight70g /2.47 oz
Gross Weight95g /3.35 oz
Approximate Weight95g /3.35 oz
Dimension 69.70 x 33.40 x 16.80mm

Product Highlights

  • Brand: Skybitz
  • Manufacturer: CS
  • Series: Standard
  • Color: Black
  • Product Type: Li-MnO2
  • Battery Type: Li-MnO2
  • Warranty: 12 Months
  • Bulk Orders: sales@batteryweb.com

Frequently Asked Questions

The SmartTank ST90 powers on fine but resets itself every time it tries to send a transmission — new battery fitted yesterday, what's wrong?

The transmission burst draws more current than the sensor polling state, and if the battery wasn't calibrated after install, the monitor's internal state map is still referencing the old pack's discharge curve. Run the full calibration cycle through the configuration menu before the unit goes back on the tank. This lets the device re-map the voltage thresholds to the new pack. After calibration, terminal voltage at idle should hold steady above 6.0V between transmissions.

The monitor won't power on after sitting in storage for six months — the battery was at full charge when I pulled it out of service, so what happened?

The BMS protection circuit cuts off at a higher voltage floor than the Li-MnO2 cells actually reach when fully depleted, so extended storage trips the BMS into lockout even when the cells themselves still hold a usable charge. Connect the pack to a compatible external charger set to the lowest available charge rate and hold it there for 30–60 minutes. If cell voltage recovers above 5.4V total, the BMS will reset and the monitor will accept it. If it doesn't respond to that slow charge, fit a replacement pack — the cells have dropped below the recovery window.

Tank level data looks correct on the dashboard, but the readings drift and timestamp irregularly during long logging sessions — battery or firmware?

That pattern points to intermittent voltage sag under the combined load of the sensor and the wireless module running concurrently. When pack voltage dips below the monitor's operating floor mid-cycle, the logging module resets its internal clock reference before the sensor catches up, producing the timestamp drift you're seeing. Check terminal voltage on the fitted pack under load — anything below 5.8V during an active transmission cycle means the pack can no longer sustain the draw. Fit a fresh 394-00010 pack and run the post-install calibration cycle before redeploying.

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