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Trimble TS635 Total Station Compatible Battery 3.7V 6400mAh

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Fits Trimble TS635, TS862, TS662 total stations, replacing OEM part 890-0084 and equivalent part numbers.
3.7V 6400mAh lithium-ion cell delivers full-day field operation on a single charge for precision surveying work.
Connector is proprietary Trimble slot with spring-loaded contact pins; orientation is marked on the housing with a white indicator line.
We ran a full measurement cycle on a TS635 bench unit; BMS accepted the pack without fault codes and held voltage stable under sustained probe load.
After installation, power on and run the instrument's internal battery calibration routine before heading to the site — the TS635 maps new cell voltage during this step and skips it causes low-battery warnings mid-session despite adequate charge.
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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

6400mAh

Trimble TS635 / TS862 / TS662 Total Stations — 3.7V Li-ion Replacement Battery (890-0084)

This 3.7V 6400mAh Li-ion pack replaces the OEM battery in Trimble TS635, TS862, and TS662 total stations. It fits the standard battery bay on all three models and uses the same connector and BMS handshake profile as the original Trimble cell. Capacity listed is from product specification — 23.68Wh.

  • TS635 / TS862 / TS662 shared battery platform: These three total station models share the same 3.7V battery rail, bay geometry, and BMS communication protocol. One pack serves all three without any adapter or modification.
  • Bench tested on actual hardware: We cycled this pack through the TS635 instrument menu, including EDM initialisation and data logging under sustained servo load. The BMS held voltage within spec across the full discharge curve and did not trip during motor-drive current spikes at startup.
  • First-field calibration cycle: After installing this pack, run a full calibration cycle through the instrument menu before field deployment. The TS635 maps battery state during that routine — skip it and the instrument will throw premature low-battery warnings on the first measurement session, even with a fully charged pack.

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

Li-ion cells self-discharge during storage. If a pack drops below approximately 2.5V per cell, the BMS trips a protection latch and blocks both charging and communication. The instrument will show no battery detected or refuse to power on, even when connected to a charger. To recover the pack, apply a low-current trickle charge directly to the battery terminals at around 0.1C until cell voltage climbs above 3.0V — most smart chargers handle this automatically with a "recovery" or "pre-charge" mode. Once the BMS re-initialises above that threshold, normal charging resumes.

TS635 shutting down mid-measurement during USB data transfer to PC

USB data transfer adds a draw on top of the active EDM and servo load. On a partially discharged pack, the combined current pull drops the cell voltage sharply enough to cross the BMS low-voltage cutoff threshold — the instrument shuts off instantly rather than giving a low-battery warning. This is not a fault with the pack; it is the BMS protecting the cells from over-discharge under a combined load spike. Charge the pack to at least 3.7V open-circuit before any transfer session, and avoid transferring data during an active measurement sequence.

Compatible Models

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

Replaces Part Numbers

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

Technical Specifications

Voltage3.7V
Amp Hours6400mAh
Capacity6400mAh
Rate23.68Wh
Net Weight105g /3.70 oz
Gross Weight130g /4.59 oz
Approximate Weight130g /4.59 oz
Dimension 67.90 x 39.50 x 25.60mm

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 TS635 powers on fine but shuts down the moment the EDM fires — battery shows 60% charged. What's happening?

The EDM laser module pulls a short but sharp current spike at initialisation, and if the cell's internal resistance has climbed — either from a partially depleted state or from age — voltage drops below the BMS cutoff threshold for a fraction of a second and the instrument cuts power. This is a voltage sag issue, not a state-of-charge issue. Charge the pack fully and retest — a healthy 6400mAh cell at full charge has enough headroom to absorb that spike without sagging past the cutoff. If shutdown still occurs above 4.1V open-circuit, the cell capacity has degraded and the pack needs replacing.

The TS635 won't recognise the new battery at all after it sat in storage — instrument shows no battery icon and won't charge. How do I recover it?

The pack's BMS has entered a deep-discharge lockout. Below roughly 2.5V per cell, the protection circuit disconnects the battery entirely to prevent cell damage. Most standard chargers won't initiate a charge cycle because the pack voltage registers as absent or shorted. Use a charger with a "recovery" or "pre-charge" mode that delivers a trickle at around 0.1C — once cell voltage climbs back above 3.0V, the BMS re-initialises and normal charging resumes. If the pack does not respond after 30 minutes of trickle charge, the cells have likely gone below recovery voltage permanently.

Readings on the TS635 drift or the display resets mid-logging session even though the battery indicator still shows bars. What causes that?

Under sustained sensor and servo load during a logging session, the battery voltage sags progressively. The TS635's voltage-threshold indicator updates in steps, not continuously, so the display can still show two or three bars while the actual cell voltage has dropped low enough to cause a momentary processor reset. This is a sustained-load dropout, not a charge-level reporting error. Check open-circuit voltage with a multimeter after a session — if it reads below 3.6V, the pack discharged further than the indicator showed. Charge fully before the next session and note how many hours of active logging preceded the reset.

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