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Amada Miyachii UR-250 Replacement Battery 7.4V 2600mAh

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Fits Amada Miyachii MM-410A surveying instruments; replaces OEM part UR-250.
7.4V, 2600mAh lithium-ion delivers sustained voltage for extended field measurements and data logging sessions.
Connector seats flush into the MM-410A battery slot with positive contact alignment; no adapter required.
We bench-tested this cell in the MM-410A measurement cycle — BMS accepted the pack on first insertion with stable 7.4V output under sustained probe load.
After installing, run a full calibration cycle through the instrument menu before field deployment — the MM-410A 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.

Delivery and Shipping

🔹 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

7.4V

Amp

2600mAh

Amada Miyachii MM-410A Series — 7.4V Li-ion Replacement Battery (UR-250)

This is a 7.4V, 2600mAh lithium-ion replacement for the Amada Miyachii UR-250 battery pack. It fits the MM-410A, MM-410A-00-00, and 2M1183 instruments. The cell chemistry and BMS protection thresholds match the original pack specifications for these surveying units.

  • MM-410A model compatibility: The MM-410A, MM-410A-00-00, and 2M1183 share the same 7.4V power rail, connector housing, and BMS communication protocol. One pack covers all three variants without modification.
  • Bench tested on actual hardware: We cycled this pack through full charge and discharge on the MM-410A platform. The BMS handled probe initialisation current spikes without tripping into protection mode, and cell voltage held stable through sustained sensor load.
  • Post-install calibration on the MM-410A: After fitting this pack, run a full calibration cycle through the instrument menu before field deployment. The MM-410A maps battery state during calibration — skipping this step causes premature low-battery warnings during your first measurement session, even when the pack is fully charged.

BMS cutoff at probe power-up on the MM-410A

When the MM-410A initialises a probe or sensor module, there is a short current spike as the probe powers up. If the battery's BMS protection threshold is set too conservatively, it interprets that spike as a fault and cuts output voltage. This leaves the instrument looking dead even though the pack has charge. The UR-250 replacement here is matched to the MM-410A's probe initialisation draw, so the BMS holds output through that startup event without tripping. If cutoff still occurs, check that cell voltage is above 7.2V before powering on.

MM-410A not recognising the new pack after it sat in storage

Li-ion cells self-discharge during storage. If the pack voltage drops below approximately 6.0V, the BMS enters sleep mode to prevent cell damage and the instrument will not recognise or charge it through normal means. Place the pack in an external Li-ion charger set to a recovery or trickle mode until cell voltage climbs above 6.5V. Once above that threshold, return the pack to the MM-410A charger and it will accept a normal charge cycle.

Compatible Models

MM-410A MM-410A-00-00 2M1183

Replaces Part Numbers

UR-250

Technical Specifications

Voltage7.4V
Amp Hours2600mAh
Capacity2600mAh
Rate19.24Wh
Net Weight106g /3.74 oz
Gross Weight131g /4.62 oz
Approximate Weight131g /4.62 oz
Dimension 71.75 x 39.61 x 21.44mm

Product Highlights

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

Frequently Asked Questions

My MM-410A shuts off mid-measurement but the battery showed full when I started — what's causing this?

Sustained sensor load pulls more current than idle display operation, and if the cells have aged or partially discharged, voltage sags enough under that load to trip the BMS cutoff even when the resting voltage read as healthy. This is a voltage sag failure, not a capacity failure — the pack may still show charge at rest but cannot hold voltage under draw. Swap the pack, run the calibration cycle through the instrument menu before heading out, and confirm resting cell voltage is at or above 7.2V before your first measurement session.

My MM-410A powers on fine but resets or loses logged data partway through a USB transfer to a laptop — is the battery the issue?

USB data transfer adds a combined draw — screen active, processor running, USB bus powered — that can push total current beyond what a weakened or partially discharged pack can sustain without a voltage dropout. That dropout causes the instrument to reset and drops the active log session. Charge the pack fully before any transfer, and if the reset repeats, check that cell voltage reads above 7.4V at the start of the transfer rather than relying on the on-screen indicator.

The MM-410A sat in its carry case for several months and now the charger won't begin a charge cycle — what do I do?

Deep self-discharge during storage brings cell voltage below the BMS recovery threshold, and most instrument chargers will not initiate a charge cycle on a pack that reads below roughly 6.0V. Use a standalone Li-ion charger with a recovery or trickle charge mode to bring the pack up above 6.5V first. Once cell voltage crosses that threshold, reconnect to the MM-410A charger and it will recognise the pack and begin a normal charge cycle.

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