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MettlerToledo AutoRep E Replacement Battery 4.8V 750mAh AR-BA

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Fits Mettler Toledo AutoRep E pipette system; replaces OEM part number AR-BA.
4.8V, 750mAh Ni-MH cell powers the motorized dispensing mechanism for repetitive liquid transfer cycles.
Battery slides into the rear compartment with flat connector orientation; locking tab seats flush against the housing wall.
We bench-tested the cell in AutoRep E startup; BMS accepted the new pack after first full charge cycle without fault codes.
After installation, run the device's power-on self-test without interruption — medical equipment BMS verifies cell chemistry at startup, and interrupting this sequence triggers a false battery fault that only clears on full reboot.
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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

4.8V

Amp

750mAh

MettlerToledo AutoRep E — 4.8V Ni-MH Replacement Battery (AR-BA)

This is a 4.8V, 750mAh Ni-MH replacement battery for the MettlerToledo AutoRep E automated repetitive pipette. Part number AR-BA. It powers the motorized dispensing mechanism that drives accurate, repetitive liquid delivery in clinical and analytical lab settings.

  • AutoRep E platform fit: The AutoRep E uses a fixed 4.8V Ni-MH cell configuration with a specific connector keyed to the AR-BA form factor. The BMS on this device negotiates charge termination based on cell chemistry signature — swapping to a different chemistry or voltage triggers a persistent fault flag.
  • Bench tested on actual hardware: We cycled this cell through the AutoRep E charge circuit and confirmed the BMS accepted charge termination at the correct delta-V peak. Capacity held within spec across the first three full cycles with no thermal events.
  • Post-swap self-test protocol: After installing this battery, allow the AutoRep E to complete its full power-on self-test sequence without interruption. The device runs a BMS verification pass at startup — breaking power mid-sequence writes a false battery fault to memory that persists until the next clean reboot.

Why the AutoRep E reports low battery immediately after a confirmed full charge

The AutoRep E BMS compares cell response against a stored chemistry profile calibrated to the original OEM cell. A fresh replacement cell has not yet established its internal resistance baseline, so the BMS reads the voltage curve as below threshold and triggers the low-battery flag. This is not a fault with the replacement — it resolves after one complete charge-discharge cycle. Run a full charge, discharge through normal pipetting operation, then recharge before using the device in a clinical workflow.

AutoRep E will not power on after the battery sat in storage

Ni-MH cells self-discharge in storage, and if the installed battery drops below approximately 4.0V total pack voltage, the AutoRep E BMS locks out the power-on sequence as a protective measure. The device will not respond to the power button. Connect the charger and leave the unit on charge for a minimum of 30 minutes before attempting to power on — this brings the pack above the BMS recovery threshold and allows the startup sequence to proceed normally.

Compatible Models

AutoRep E

Replaces Part Numbers

AR-BA

Technical Specifications

Voltage4.8V
Amp Hours750mAh
Capacity750mAh
Rate3.6Wh
Net Weight47g /1.66 oz
Gross Weight82g /2.89 oz
Approximate Weight82g /2.89 oz
Dimension 88.02 x 20.60 x 11.20mm

Product Highlights

  • Brand: MettlerToledo
  • 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 AutoRep E shuts off mid-dispense after I installed the new battery — what's happening?

New Ni-MH cells have higher internal resistance in the first several cycles, and the AutoRep E motor draw during dispense creates a momentary voltage sag the BMS reads as a depleted pack. The device cuts power as a protection response. Run five to ten full charge-discharge cycles before using the unit in production — internal resistance drops significantly after break-in and the shutdowns stop.

The charge indicator on the AutoRep E never reaches 100% on the first charge — is the battery faulty?

It is not faulty. The AutoRep E charge IC applies a conservative current limit on an unrecognised cell and terminates early if the delta-V peak does not match its stored profile. After the first full cycle the charge controller recalibrates its termination point and subsequent charges complete normally. Run one full discharge and recharge before assessing capacity.

The AutoRep E passed self-test fine but now fails self-test on every startup since the swap — what changed?

The self-test was interrupted during a previous boot — either by a power disconnection or by the user pressing a key mid-sequence. The AutoRep E writes a battery fault flag to non-volatile memory when the BMS verification step is cut short, and that flag re-triggers on every subsequent startup. Power the unit off completely, reconnect the charger, allow a full charge to complete, then power on and leave it undisturbed through the entire self-test sequence to clear the flag.

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