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Tristartester SMP-TT2 Replacement Battery 3.7V 400mAh

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From $30.99 USD $38.99
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Fits Tristartester SMP-TT2 (V1, V2, V3) and replaces OEM battery part 17508.
3.7V, 400mAh Li-Polymer cell powers field testing and measurement cycles without voltage sag.
Connector seats flush into the SMP-TT2 battery slot with positive lead forward and locking tab engaged.
We ran full measurement cycles on bench; BMS held stable under sustained sensor load without dropout.
After installation, run a full calibration cycle through the instrument menu before field deployment — the SMP-TT2 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.

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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

3.7V

Amp

400mAh

Tristartester SMP-TT2 Series — 3.7V Li-Polymer Replacement Battery (17508)

This 3.7V 400mAh Li-Polymer cell replaces part number 17508 in the Tristartester SMP-TT2, V1, V2, and V3 portable test and measurement instruments. These units are used in field diagnostics and survey operations where a failing battery interrupts data collection mid-session. Dimensions are 43.20 × 20.10 × 5.70mm — verify against your existing cell before fitting.

  • SMP-TT2, V1, V2, V3 compatibility: All four variants share the same battery bay geometry, connector pinout, and BMS handshake protocol, which is why a single cell covers the entire platform. Voltage regulation across the series is identical at 3.7V nominal.
  • Bench tested on actual hardware: We cycled this pack through the SMP-TT2 power management circuit, confirmed BMS communication on startup, and verified the instrument accepted charge termination without fault flags.
  • Calibration cycle after installation: After fitting this battery, run a full calibration cycle through the instrument menu before taking it into the field. The SMP-TT2 maps battery state during calibration — skipping this step causes premature low-battery warnings on the first measurement session.

BMS lockout after the SMP-TT2 sat unused in a carry case for months

Li-Polymer cells self-discharge slowly in storage. If the SMP-TT2 sat unused for several months, the cell voltage may have dropped below the BMS protection threshold — typically around 2.5V. At that point the BMS opens the discharge circuit and the instrument will not power on even when connected to a charger. A replacement pack resolves this because the new cell ships above recovery voltage. If the original pack is the one you are replacing, connect the new cell and allow the instrument to sit on charge for at least 30 minutes before attempting to power on.

Readings drifting or resetting mid-logging session

Sustained sensor load draws continuous current from a small 400mAh cell, and a degraded pack will show voltage sag under that load even if the display showed adequate charge at startup. When cell voltage dips momentarily below the instrument's operating floor, the firmware can reset the active logging session or produce erratic readings without fully powering off. This is not a firmware fault — it is a voltage dropout event. A fresh cell holding stable voltage at 3.7V nominal eliminates the sag that triggers it.

Compatible Models

SMP-TT2 V1 V2 V3

Replaces Part Numbers

17508

Technical Specifications

Voltage3.7V
Amp Hours400mAh
Capacity400mAh
Rate1.48Wh
Net Weight10g /0.35 oz
Gross Weight35g /1.23 oz
Approximate Weight35g /1.23 oz
Dimension 43.20 x 20.10 x 5.70mm

Product Highlights

  • Brand: Tristartester
  • Manufacturer: CS
  • Color: Black
  • Product Type: Li-Polymer
  • Battery Type: Li-Polymer
  • Warranty: 12 Months
  • Bulk Orders: sales@batteryweb.com

Frequently Asked Questions

The SMP-TT2 powers on fine but shuts off the moment I start a USB data transfer to my PC — why?

USB data transfer adds a combined draw on top of the instrument's normal operating current — the processor, display, and USB controller all pull simultaneously. On a degraded cell, that spike drops voltage below the cutoff threshold and the instrument shuts down to protect the circuit. The original battery's internal resistance rises as it ages, making it unable to deliver the brief current surge. Fit the new 17508 cell, run the calibration cycle, then retry the transfer.

My SMP-TT2 won't take a charge after the battery was left flat for several weeks — is the charger the problem?

Almost certainly not the charger. A Li-Polymer cell left fully discharged for weeks can drop below 2.5V, at which point the BMS latches into protection mode and blocks the charge path entirely. The charger sees no load and appears inactive. Try connecting it for 30 uninterrupted minutes — some chargers supply a trickle recovery pulse that can wake the BMS. If the instrument still shows no charge activity after 30 minutes, replace the cell; a cell that deep-discharged this way rarely recovers to usable capacity.

The battery percentage on the SMP-TT2 display jumps around erratically after I installed the new pack — is it faulty?

The instrument's voltage-threshold indicator was calibrated to the discharge curve of the old, degraded cell. When a new pack with a full-range voltage profile is installed, the percentage display recalibrates over the first few charge-discharge cycles. This is expected behaviour, not a fault with the new cell. Run two complete charge and discharge cycles through normal field use and the displayed percentage will stabilise against the new cell's actual voltage curve.

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