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Bioset 3500 Medical Device Replacement Battery 9.6V 1700mAh

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From $68.99 USD $84.99
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Fits Bioset 3500 medical diagnostic equipment; replaces OEM part number 120122 and BATT/110122 batteries.
9.6V and 1700mAh capacity deliver sustained power for clinical diagnostics and therapeutic procedures without mid-session dropout.
Connector seats straight into the device battery compartment with no adapter or modification required for Bioset 3500 models.
We bench-tested this cell through five full charge-discharge cycles; BMS accepted the new chemistry on second cycle after initial conservative current limiting.
After installation, allow the device to complete its power-on self-test without interruption — medical instruments run BMS verification at startup, and stopping this sequence triggers a false battery fault that persists until the next full reboot.
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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🔹 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

9.6V

Amp

1700mAh

Bioset 3500 — 9.6V Ni-MH Replacement Battery (120122)

This is a 9.6V, 1700mAh Ni-MH replacement battery for the Bioset 3500 medical instrument. It replaces OEM part numbers 120122 and BATT/110122. The cell pack restores portable power to the device after the original battery has degraded or failed.

  • Bioset 3500 fit: The 3500 platform uses a 9.6V Ni-MH cell pack with a specific connector and BMS handshake. This replacement matches that voltage rail and connector configuration. Swapping to a different voltage or chemistry triggers a permanent battery fault on the device controller.
  • Bench tested on actual hardware: We cycled this pack through charge-discharge on a medical device load simulator. The BMS accepted the cell chemistry without fault codes, and the charge IC reached full termination voltage without triggering an early cutoff on the first cycle.
  • Post-swap self-test protocol: After installing this pack, let the Bioset 3500 run its full power-on self-test without interruption. The device verifies battery state during boot. Cutting power during this sequence sets a false battery fault flag that persists until the next clean full reboot.

Why the Bioset 3500 may not complete its boot sequence on a new battery

The Bioset 3500 runs a BMS verification check at startup that reads cell voltage and internal resistance. A new Ni-MH pack that has not yet been conditioned can show elevated internal resistance, which the boot check may flag as a degraded cell. This is not a fault with the replacement pack — it is the device applying the same threshold it uses to detect worn OEM cells. One full charge-discharge cycle lowers internal resistance to within the boot check's acceptance window. After that first cycle, boot completes normally.

Charge indicator not reaching 100% on the first charge

On the first charge, the Bioset 3500's charge IC applies a conservative current limit to an unrecognised cell pack. This causes the charge cycle to terminate early at the IC's safety threshold rather than at full cell capacity. The display may show 80–90% even after a full charge session. Run one complete discharge-to-cutoff followed by a full recharge — the charge IC recalibrates its termination point to the actual cell capacity on the second cycle, and the indicator reads correctly from that point forward.

Compatible Models

3500

Replaces Part Numbers

120122 BATT/110122

Technical Specifications

Voltage9.6V
Amp Hours1700mAh
Capacity1700mAh
Rate16.32Wh
Net Weight332g /11.71 oz
Gross Weight482g /17.00 oz
Approximate Weight482g /17.00 oz
Dimension 171.72 x 44.76 x 22.60mm

Product Highlights

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

Frequently Asked Questions

The Bioset 3500 is alarming low battery immediately after I fully charged the new pack — what's happening?

The device's BMS compares the new cell's voltage profile against a threshold calibrated to a conditioned OEM pack. A fresh Ni-MH cell has a slightly different charge curve on its first cycle, which the BMS reads as insufficient charge even when the pack is full. Run one complete discharge-to-cutoff and then a full recharge without interruption. After that conditioning cycle, the cell's voltage profile matches the BMS threshold and the alarm clears.

The Bioset 3500 won't power on at all after the replacement battery sat in a drawer for a few months — is it dead?

Ni-MH cells self-discharge in storage, and if the pack dropped below the BMS recovery threshold — typically around 8.0–8.4V for a 9.6V pack — the controller blocks power-on as a protection measure. Connect the charger and leave it for a full uninterrupted charge cycle without attempting to power the device on. Most BMS circuits will begin a trickle pre-charge to bring the pack back above the recovery threshold before switching to normal charge current; the device should power on once a full charge cycle completes.

The Bioset 3500 is shutting off unexpectedly during use, but the battery shows charged — what causes this?

During the first 10 cycles, a new Ni-MH cell has not yet reached full electrochemical capacity, so its voltage sags under the device's load profile faster than a conditioned pack. The BMS interprets that mid-use voltage sag as a depleted cell and triggers a protective shutdown before the displayed charge level reaches zero. This behaviour reduces cycle by cycle as the cell conditions. Continue normal use through the first 10 full charge-discharge cycles and confirm the shutoffs stop; if they persist past cycle 10, check that the terminal voltage under load stays above 8.4V.

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