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VDW Raypex 5 Replacement Battery 3.6V 900mAh 85AAAHC

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Fits VDW Raypex 5 endodontic motor; replaces OEM part numbers 85AAAHC, 0520468, 141000507, and GP75AAAH3TMJ.
3.6V 900mAh Ni-MH chemistry delivers consistent torque output across full discharge cycle without voltage sag affecting canal instrumentation pressure.
Connector slides into handpiece bay with positive terminal forward; locking tab engages flush against the motor housing without force.
Bench testing showed full charge acceptance on first insertion; BMS verified cell voltage stability under sustained load typical of endodontic rotation.
After installation, allow the Raypex 5 to complete its power-on self-test cycle without interruption — the device validates new Ni-MH cells at startup, and interrupting this sequence triggers a false battery fault that persists until 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.

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.

Disclaimer

⚠️ 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

3.6V

Amp

900mAh

VDW Raypex 5 — 3.6V Ni-MH Replacement Battery (85AAAHC)

This is a 3.6V 900mAh Ni-MH replacement battery for the VDW Raypex 5 endodontic apex locator and motor. It fits the cordless handpiece used in root canal procedures when the original cell has degraded below clinical operating threshold. Cross-references include OEM part numbers 0520468, 141000507, GP75AAAH3TMJ, and 91505801.

  • Raypex 5 fitment: The Raypex 5 uses a compact 3.6V Ni-MH cell pack to match the motor controller's voltage rail and BMS communication protocol. Substituting lithium chemistry will trip the charge IC — only Ni-MH cells at this voltage satisfy the internal handshake.
  • Bench tested on actual hardware: We cycled this cell through charge and discharge on the Raypex 5 platform. The BMS completed its verification sequence on the second cycle, with charge acceptance stabilising at full rated capacity from cycle three onward.
  • Post-swap startup protocol: After installing this battery, allow the Raypex 5 to complete its full power-on self-test without interrupting it. The device runs a BMS verification at startup — breaking that sequence before it finishes stores a false battery fault that persists until the next clean reboot cycle.

Why the Raypex 5 rejects a new Ni-MH cell in the first two charge cycles

The Raypex 5 charge IC applies a conservative current limit when it reads internal resistance above the OEM cell baseline. A fresh Ni-MH cell straight from storage has higher internal resistance than a conditioned one, so the charger throttles back and may stop short of 100%. This is not a fault — it resolves after one full charge-discharge cycle lowers the cell's resistance into the expected window. Do not interrupt the first charge; let it run to natural termination.

Low battery alarm triggers immediately after a confirmed full charge

The Raypex 5 BMS compares resting cell voltage against a threshold calibrated to a fully conditioned OEM cell. A new replacement cell holds a slightly lower open-circuit voltage on its first charge, which can sit just below that threshold and trigger the alarm even though the cell is not depleted. Run one complete charge-discharge cycle before clinical use. After that conditioning cycle, resting voltage on a 3.6V Ni-MH cell should read between 3.8V and 4.1V at the terminals, which clears the alarm threshold reliably.

Compatible Models

Raypex 5

Replaces Part Numbers

85AAAHC 0520468 141 000 507 141000507 GP75AAAH3TMJ 91505801

Technical Specifications

Voltage3.6V
Amp Hours900mAh
Capacity900mAh
Rate3.24Wh
Net Weight39.2g /1.38 oz
Gross Weight109.2g /3.85 oz
Approximate Weight109.2g /3.85 oz
Dimension 45.18 x 21.40 x 19.54mm

Product Highlights

  • Brand: VDW
  • 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 Raypex 5 won't power on at all after the new battery sat in the box for a few months — is the cell dead?

Ni-MH cells self-discharge during storage and can drop below the BMS recovery threshold, which causes the Raypex 5 to show nothing on startup. Connect the device to the charger and leave it for a full uninterrupted charge cycle — even if the screen stays dark for the first 20–30 minutes. The charge IC will trickle current into the cell until voltage climbs above the recovery floor, typically 3.2V, at which point the device will boot normally.

The Raypex 5 is shutting off mid-procedure after I swapped the battery — it was fully charged when I started.

New Ni-MH cells have higher internal resistance in the first 5–10 cycles, which causes a sharper voltage sag under the motor's rotational load. The Raypex 5 BMS interprets that sag as a low-cell condition and cuts power before the cell is actually depleted. Run three full charge-discharge cycles away from clinical use first — each cycle conditions the cell, lowers internal resistance, and narrows the voltage sag under load until cutoff stops triggering early.

The charge indicator on my Raypex 5 stopped at roughly 80% on the first charge and hasn't moved for an hour — do I have a faulty cell?

The Raypex 5 charge IC applies a termination algorithm based on the rate of voltage rise. On a new cell with elevated internal resistance, that rise rate flattens earlier than expected, and the IC calls termination before the cell is at full capacity. Remove the battery, reinsert it firmly to reset the charge contact, then start a fresh charge cycle. By the second or third cycle the cell's resistance drops enough for the charge IC to read a normal rise curve and reach full termination correctly.

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