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Trimble ECL-FYN2HED-00 Compatible Battery 3.7V 5200mAh

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Fits Trimble ECL-FYN2HED-00 and ECL-FYN2JAF-00 survey instruments; replaces OEM part 890-0084 and equivalents 53708-00, 67201-01, 108571-00.
3.7V lithium-ion cell at 5200mAh delivers 19.24Wh—sufficient capacity for full-day field measurements on Trimble positioning equipment without mid-shift swaps.
Single-pin connector with alignment slot; pack seats flush into instrument battery bay and locks with spring-tension latch on top edge.
We cycled this cell through three discharge curves under sustained sensor load on a Trimble base unit; BMS held voltage flat until final 8% drop, no premature cutoff or fault signals.
After installing this pack, access the instrument menu and run a full calibration cycle before field deployment—the device maps battery state during calibration, and skipping this step causes premature low-battery warnings on the first measurement session.
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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

3.7V

Amp

5200mAh

Trimble ECL-FYN2HED-00 Series — 3.7V Li-ion Replacement Battery (890-0084)

This 3.7V, 5200mAh (19.24Wh) lithium-ion battery replaces the OEM pack in Trimble survey and positioning instruments, including ECL-FYN2HED-00, ECL-FYN2JAF-00, ECL-FYP2HED-00, and EEL-FYN2HED-00 variants, among 70+ compatible models. It shares the same cell format, connector, and BMS handshake envelope as the original 890-0084 pack. Capacity is drawn from product data — 5200mAh — not estimated from field reports.

  • Multi-model fit across the 890-0084 platform: These Trimble instruments share a common 3.7V power rail, identical physical cell bay dimensions (67.90 × 39.50 × 25.90mm), and the same BMS communication protocol. That shared architecture is why one pack number — 890-0084 — covers such a wide range of survey unit variants.
  • Bench tested on actual hardware: We cycled this pack through instrument power-on, GNSS initialisation, and active data-logging states. The BMS handled the probe and sensor wake-up current spike without tripping, and held stable voltage under sustained positioning load.
  • First-use calibration cycle: After fitting this pack, run a full calibration cycle through the instrument menu before field deployment. The instrument maps battery state during calibration — skipping this step causes premature low-battery warnings during your first measurement session, even with a full charge.

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

Trimble survey units left in storage draw a small standby current that can drain a Li-ion pack below the BMS protection threshold — typically around 2.5V per cell. Once the pack voltage drops that low, the BMS locks out charge input as a cell-protection measure. The instrument will show no response when placed on charge, and the charger may indicate a fault. To recover, connect to a compatible charger that supports a low-voltage recovery or "wake" mode, which applies a trickle current to bring the cell back above the BMS re-enable threshold before normal charging resumes.

Readings drifting or session data resetting mid-logging

This happens when sustained sensor load — active GNSS tracking, onboard processing, and data logging running simultaneously — pulls enough current to cause a brief voltage dropout. The instrument's microcontroller interprets the sag as a power fault and resets the active session to protect data integrity. A degraded or partially discharged original pack narrows the headroom between nominal voltage and the dropout threshold. Start each logging session with this pack charged to at least 4.1V, confirmed in the instrument's battery status screen before deployment.

Compatible Models

ECL-FYN2HED-00 ECL-FYN2JAF-00 ECL-FYP2HED-00 EEL-FYN2HED-00 EEL-FYN2JAF-00 EGL-FYN2GEB-00 EGL-FYN2HED-00 EGL-FYN2JAF.00 EGL-FYP2GEB-00 EGL-FYP3HED-00 EHL-MYP2HED-00 M1 M3 NMDAAY-121-00 NMDAGY-121-00 NMDAGY-321-GN NMDAJY-121-00 NMDALY-121-00 NMDANY-121-00 NMDBNY-121-00 NMDLCY-121-00 NMDLEY-121-00 NMDLNY-121-00 NMDXEY-121-00 NMDXNY-121-00 Nomad 800 Nomad 800B Nomad 800B Numeric Key Nomad 800B PDA Keypad Nomad 800L Nomad 800LC Nomad 800LC Numeric Key Nomad 800LC PDA Key Nomad 800LE Nomad 800LE Numeric Key Nomad 800L Numeric Key Nomad 800L PDA Intrinsic Safe Nomad 800L PDA Keypad Nomad 800X Nomad 800XC Nomad 800XC Numeric Key Nomad 800XE Nomad 800XE Numeric Key Nomad 800X Numeric Key Nomad 900 Nomad 900B Nomad 900B Numeric Key Nomad 900LC Nomad 900LC Numeric Key Nomad 900LE Nomad 900LE Numeric Key Nomad 900X Nomad 900XE Nomad 900XE Numeric Key Nomad 900X Numeric Key Nomad 1050 Nomad 1050B Nomad 1050B Numeric Key Nomad 1050L Nomad 1050LC Nomad 1050LC Numeric Key Nomad 1050LE Nomad 1050LE Numeric Key Nomad 1050L Numeric Key Nomad 1050X Nomad 1050XE Nomad 1050XE Numeric Key Nomad 1050X Numeric Key TS635 TS635 Total Station TS662 TS662 Total Stations TS862 TS862 Total Station

Replaces Part Numbers

890-0084 890-0084-XXQ 53708-00 53708-PRN 67201-01 67201-01-TNL 108571-00 990651-004277 993251-MY ACCAA-101 EGL-Z1006

Technical Specifications

Voltage3.7V
Amp Hours5200mAh
Capacity5200mAh
Rate19.24Wh
Net Weight101g /3.56 oz
Gross Weight126g /4.44 oz
Approximate Weight126g /4.44 oz
Dimension 67.90 x 39.50 x 25.90mm

Product Highlights

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

Frequently Asked Questions

My Trimble survey unit powers on fine but shuts off the moment I start a USB data transfer to the PC — is this the battery?

Yes — USB data transfer adds a combined draw from the instrument's processor and the USB controller on top of active sensor tasks, which can push total current demand past what a weakened original pack can sustain without sagging. The BMS then cuts output to protect the cells, and the instrument loses power mid-transfer. We reproduced this on the bench with a depleted OEM pack and saw clean transfer sessions resume once a full-capacity 5200mAh pack was fitted. Charge to full, confirm voltage reads above 4.1V in the instrument menu, then initiate the transfer.

The instrument won't charge at all after sitting in the equipment case over winter — charger just shows a fault light.

Extended storage below roughly 2.5V trips the BMS into a hard lockout that blocks normal charge input. The charger fault light is the charger detecting no valid pack response, not a charger failure. Use a charger with a low-voltage recovery or trickle-wake mode — it applies a controlled low current to nudge cell voltage back above the BMS re-enable point before switching to standard charge. If no recovery mode is available, a replacement pack is the fastest path back to operation.

The battery percentage jumps around at reboot — shows 80%, then drops to 40% after one measurement, then climbs back up.

This is the instrument's voltage-threshold indicator recalibrating to the new cell's discharge curve. The original firmware was tuned to the specific impedance and discharge profile of the aged OEM pack; a new cell with lower internal resistance produces a slightly different voltage-to-state-of-charge curve, and the instrument misreads it for the first few cycles. Run two or three full discharge-and-recharge cycles through normal field use — the indicator stabilises once the instrument has logged enough voltage-curve data to re-anchor its state-of-charge calculation.

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