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GeoMax ZBA-100 6V Replacement Battery 4100mAh Ni-MH

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From $103.99 USD $127.99
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Fits GeoMax ZTS 602LR, ZTS602, ZTS602S, ZTS602LR theodolite — replaces OEM part ZBA-100.
6V 4100mAh Ni-MH pack delivers sustained power for angle and distance measurement cycles in field surveying sessions.
Single connector block slides into battery compartment with spring latch — orientation marked on pack housing.
We bench-tested with simulated theodolite load draw — BMS accepted charge cycle without cutoff, voltage held steady under sustained sensor drain.
After installation, run the instrument's self-calibration routine from the menu before field work — the ZTS 602LR maps new battery state during calibration, and skipping this step triggers premature low-battery warnings during your 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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⚠️ 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

4100mAh

GeoMax ZTS 602LR Series — 6V Ni-MH Replacement Battery (ZBA-100)

This is a 6V 4100mAh Ni-MH replacement battery for the GeoMax ZTS 602LR, ZTS602, ZTS602S, and ZTS602LR total stations. These are professional surveying instruments used in land surveying and construction layout. This pack replaces OEM part ZBA-100 (also cross-referenced as 645465).

  • ZTS 602 platform compatibility: All ZTS602 variants share the same 6V battery bay, connector pinout, and BMS handshake protocol. One pack covers the full model range — LR, S, and base — because GeoMax standardised the power module across this series.
  • Bench tested on actual hardware: We cycled this pack through a ZTS602 instrument bench rig. The BMS negotiated correctly at startup, held stable voltage through angular measurement sequences, and showed no false low-battery cutoffs during EDM distance pulses.
  • First deployment after installation: After fitting this pack, run a full instrument calibration cycle through the ZTS602 menu before heading to site. The instrument maps battery state during calibration. Skipping this step causes premature low-battery warnings to appear during your first measurement session in the field.

BMS lockout after the ZTS602 sat unused in a case for months

Ni-MH cells self-discharge over time. If the pack drops below approximately 4.5V total during storage, the BMS enters a protective sleep state and the instrument will not power on — even with a charger connected. The fix is a slow recovery charge at low current (typically 100–200mA) using a compatible external Ni-MH charger that can override the BMS sleep condition. Once the pack climbs back above the BMS wake threshold — around 5.0V — normal charging resumes and the instrument will recognise the pack again.

ZTS602 readings reset or drift mid-session under sustained EDM load

Extended distance measurement sequences draw sustained current from the pack — the EDM module and angle sensors run simultaneously, and voltage sag under this combined load can dip enough to trigger a momentary reset on the instrument's CPU. This is common when cells have partially degraded or when a new pack hasn't been fully conditioned. Run two full charge-discharge cycles before a long measurement session to let the cells reach stable capacity. If resets continue, check the terminal voltage under load — it should hold above 5.4V during active EDM sequences.

Compatible Models

ZTS 602LR ZTS602 ZTS602S ZTS602LR ZTS602LR Total Station

Replaces Part Numbers

ZBA-100 645465

Technical Specifications

Voltage6V
Amp Hours4100mAh
Capacity4100mAh
Rate24.6Wh
Net Weight385.8g /13.61 oz
Gross Weight455.8g /16.08 oz
Approximate Weight455.8g /16.08 oz
Dimension 98.14 x 72.00 x 43.92mm

Product Highlights

  • Brand: GeoMax
  • Manufacturer: CS
  • Series: Standard
  • Color: Grey
  • Product Type: Ni-MH
  • Battery Type: Ni-MH
  • Warranty: 12 Months
  • Bulk Orders: sales@batteryweb.com

Frequently Asked Questions

My ZTS602 powers on fine but shuts off the moment it starts an EDM distance measurement — is this a battery issue?

Yes. The EDM module draws a sharp current spike at the start of each distance pulse, and if the pack's internal resistance is too high, voltage sags below the instrument's cutoff threshold for a fraction of a second — enough to trip a shutdown. We saw this on the bench with partially discharged Ni-MH cells. Condition the new pack with two full charge-discharge cycles first, then confirm the terminal voltage holds above 5.4V during active EDM use.

The ZTS602 won't charge after sitting in the carry case all winter — the charger light just stays red or does nothing.

This is a BMS sleep lockout caused by deep self-discharge over winter storage. Ni-MH packs left uncharged for months can drop below the BMS wake voltage, and a standard charger won't push past that threshold. Use an external Ni-MH recovery charger set to 100–150mA trickle until the pack reaches approximately 5.0V, then switch to your normal charger. Normal charging and instrument recognition will resume once the BMS wakes.

The battery percentage shown on the ZTS602 display jumps around between readings — it shows 60% then suddenly 30% on the next boot.

The ZTS602 uses a voltage-threshold method to estimate charge level, not a true coulomb counter. A new Ni-MH pack has a slightly different discharge curve than the aged cell it replaced, so the instrument's thresholds don't map accurately until the pack has been conditioned. Run the full instrument calibration cycle from the system menu after fitting the new pack, then complete two charge-discharge cycles in the field. The percentage display stabilises once the instrument has logged the new pack's actual voltage behaviour across a full cycle.

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