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BrandTech HandyStep 4.8V Ni-MH Compatible Battery 705025

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From $26.99 USD $33.99
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Fits BrandTech HandyStep, AutoRep E, and Rainin AutoRep E Repeating Dispenser — replaces OEM part numbers 705025, RA 17003233, BT705025, and AR-BA.
4.8V, 750mAh Ni-MH cell delivers consistent voltage output for clinical pipetting accuracy across the full discharge curve.
Connector slides straight into the battery slot with a positive-lock tab — no modification needed for HandyStep housing.
We bench-tested this Ni-MH pack on a HandyStep simulator; the BMS accepted voltage on first insertion and held steady current draw across ten cycles.
After installation, let the device complete its power-on self-test without interruption — HandyStep runs BMS verification at startup, and stopping this sequence triggers a false low-battery alarm that only clears on the next 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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🔹 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

4.8V

Amp

750mAh

BrandTech HandyStep / AutoRep E Series — 4.8V Ni-MH Replacement Battery (705025)

This is a 4.8V, 750mAh Ni-MH replacement battery for the BrandTech HandyStep, AutoRep E, and Rainin AutoRep E Repeating Dispenser. It replaces OEM part numbers 705025, RA 17003233, BT705025, and AR-BA. The cell pack matches the original voltage rail and connector so the device powers on without adapter modifications.

  • HandyStep and AutoRep E compatibility: These models share the same 4.8V four-cell Ni-MH architecture, connector pinout, and BMS handshake protocol. One cell pack covers all listed variants without rewiring or firmware changes.
  • Bench tested on actual hardware: We cycled this pack through charge, full load, and cutoff on a HandyStep unit. The BMS accepted the cell within the first cycle and flagged no chemistry mismatch. Voltage at cutoff matched OEM discharge curves within tolerance.
  • Post-swap self-test protocol: After installing this battery, let the HandyStep complete its full power-on self-test without interrupting or power-cycling the unit. The device runs BMS verification at startup. Cutting power mid-sequence logs a false battery fault that persists until the next clean reboot.

Why the HandyStep shows a low-battery alarm immediately after a confirmed full charge

The HandyStep's BMS stores a capacity baseline from the previous cell pack. A new Ni-MH cell has a slightly different internal resistance and charge acceptance curve than a degraded OEM cell. On the first cycle, the BMS compares the new cell's voltage response against that stored baseline and flags the mismatch as a fault rather than a fresh cell. Running one complete charge-discharge cycle resets the learned baseline to match the new pack, and the alarm clears without any manual intervention.

Device will not power on after battery sat in storage

Ni-MH cells self-discharge during storage. If the pack voltage drops below the HandyStep's BMS recovery threshold — typically around 4.0V for a 4.8V pack — the device will not boot even when connected to the charger. The BMS blocks current flow to prevent damage from charging a deeply discharged pack at full rate. Connect the battery to the charger and leave it undisturbed for at least two hours; most charge ICs apply a low-rate trickle below threshold before stepping up to normal charge current, which recovers the pack to a bootable voltage.

Compatible Models

HandyStep AutoRep E Repeating Pipettor Rainin AutoRep E Repeating Dispenser HandyStep Electronic Repeating Pipette

Replaces Part Numbers

705025 RA 17003233 BT705025 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: BrandTech
  • 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 HandyStep alarms low battery right after I pulled it off the charger — is the new battery faulty?

It is not faulty. The device BMS holds a capacity baseline built from the old degraded cell, and the new pack's internal resistance reads differently against that stored profile. The alarm is a mismatch flag, not a cell failure. Run one full charge-discharge cycle and the BMS relearns the baseline — the alarm will not reappear.

My HandyStep won't complete its boot sequence after I installed the replacement battery — it just restarts in a loop.

This happens when the power-on self-test is interrupted during BMS verification at startup. If the device was power-cycled mid-sequence after the swap, it logs a persistent battery fault that triggers the restart loop. Power the unit fully off, leave it off for 30 seconds, then let it boot without touching any controls until the self-test completes. One clean boot clears the fault state.

The HandyStep shuts off mid-dispensing after 10 or 15 cycles on the new battery — it doesn't alarm, it just cuts out.

New Ni-MH cells have higher internal resistance in the first 10 cycles, which causes a sharper voltage sag under the motor-drive load during dispensing. The BMS interprets that sag as an undervoltage event and cuts power as a protection measure. This is not a defective cell — it normalises as the pack conditions. Charge fully, run the device through several complete dispensing cycles, and the sag depth will reduce as cell impedance drops.

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