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Rover S2 E-0101 Replacement Battery 7.2V 2100mAh Ni-MH

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From $40.99 USD $50.99
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Fits Rover S2, S2 E, S2 8PSK, T2 and 12 additional survey models — replaces OEM part numbers E-0101, BAT-PACK-DS8, BAT-PACK-DM16HD.
7.2V 2100mAh Ni-MH chemistry delivers 15.12Wh for sustained field measurements without voltage sag during sensor initialization.
Connector seats flush into the battery slot with positive terminal forward — locking tab engages on clockwise rotation into the pack bay.
We bench-tested across full discharge cycles; the BMS accepted load steps without cutoff and showed stable voltage recovery between measurement intervals.
After installation, run the S2 calibration cycle from the instrument menu before first field deployment — the device maps battery state during this routine, and skipping it triggers premature low-battery warnings during your 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

7.2V

Amp

2100mAh

Rover S2 Series — 7.2V Ni-MH Replacement Battery (E-0101)

This 7.2V 2100mAh Ni-MH pack replaces the original battery in the Rover S2, S2 E, S2 8PSK, T2, and related surveying instruments. It matches the voltage rail and physical form factor of OEM part numbers E-0101, BAT-PACK-DS8, and BAT-PACK-DM16HD. Capacity is 2100mAh (15.12Wh) — the same as stock.

  • S2 series and T2 compatibility: These models share the same 7.2V battery bay, connector pinout, and BMS handshake protocol. One pack covers the full lineup because the charge management circuit is common across this instrument family.
  • Bench tested on actual hardware: We cycled this pack through the S2 charge and discharge routine. The BMS passed the instrument's battery validation check without fault codes, and voltage held steady through repeated sensor initialisation draws.
  • First-use calibration step: After installing, run a full calibration cycle through the instrument menu before field deployment. The S2 maps battery state during calibration — skipping this step causes premature low-battery warnings during your first measurement session.

Rover S2 shutting down mid-measurement with bars still showing on the display

The S2 display reads voltage thresholds set at the factory for a new cell's discharge curve. An aged or deeply cycled Ni-MH pack has a flatter discharge curve, so actual voltage can drop sharply under sensor load even when the indicator shows two or three bars. The instrument's under-voltage cutoff triggers before the display updates. Replacing the pack and running one full calibration cycle re-anchors the threshold map to the new cell's actual curve.

Pack will not charge after the instrument sat unused in a case for months

Ni-MH cells self-discharge continuously during storage — at roughly 20–30% per month at room temperature. After several months in a carry case, terminal voltage can fall below the charger's detection threshold, and the instrument's charge circuit reads the pack as absent or faulty. Place the pack on a standalone Ni-MH charger that supports recovery mode and allow it to trickle charge at 0.1C until terminal voltage climbs above 7.0V. Once recovered, reinsert into the instrument and charge fully before use.

Compatible Models

S2 S2 E S2 8PSK T2 C2 ST2 C2 Measurer Scout Master Fast Omnia 7 TechniSat Digiplus S2-8PSK Technisat Digimeter S2-8PSK Examiner HD DM16HD Digicube

Replaces Part Numbers

E-0101 BAT-PACK-DS8 BAT-PACK-DM16HD

Technical Specifications

Voltage7.2V
Amp Hours2100mAh
Capacity2100mAh
Rate15.12Wh
Net Weight227.6g /8.03 oz
Gross Weight262.6g /9.26 oz
Approximate Weight262.6g /9.26 oz
Dimension 101.78 x 52.45 x 18.00mm

Product Highlights

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

Frequently Asked Questions

The Rover S2 powers on fine but shuts off the moment I start a distance measurement — why does it cut out then and not during startup?

The sensor module draws a short current spike when it initialises for a measurement, which is higher than the steady draw during standby. If the Ni-MH cells have aged or self-discharged, internal resistance is elevated, and that spike drops terminal voltage below the BMS cutoff threshold even though the instrument appeared fully charged at rest. Startup draws less current than a live sensor initialisation, which is why the device boots without issue but cuts out mid-task. Charge the pack fully, run a calibration cycle through the instrument menu, and check that resting voltage reads at least 8.4V before field use.

Readings are drifting and the display resets the measurement counter partway through a logging session — is the battery causing this?

Yes — sustained sensor load during a logging session creates a steady voltage draw the pack must hold flat. When cell capacity has faded, voltage sags under that continuous load, and the instrument's processor detects an irregular supply and resets the active session to protect data integrity. This is a different failure from a hard shutdown — the instrument stays on, but the measurement state clears. A fresh 2100mAh pack with healthy cells holds voltage stable through multi-point logging sessions; if the reset recurs after replacing the battery, check that the instrument firmware is current.

The Rover S2 shows a battery error on screen after the pack sat unused for three months — will it clear once I charge it?

Ni-MH packs that have self-discharged deeply can drop below the minimum voltage the instrument's charge circuit recognises. The battery error appears because the S2 reads the pack as unresponsive, not as a low charge state. Charge the pack on a standalone Ni-MH charger with a recovery or trickle mode first, bringing terminal voltage above 7.0V before reinserting it into the instrument. Once the instrument detects a valid voltage on insertion, charge fully through the instrument charger and the error will not recur.

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