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Diversified Medical NAL8100RB 12V Replacement Battery 4400mAh

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From $118.99 USD $146.99
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Fits Diversified Medical NAL8100RB medical device, replaces OEM battery NAL8100RB.
12V, 4400mAh Ni-MH chemistry delivers sustained output for extended clinical shifts without mid-procedure drops.
Connector type and orientation match OEM housing — no modification needed, seats flush with locking tab engagement.
We bench-tested this cell through five full charge-discharge cycles on Diversified Medical chargers; BMS accepted the new pack after cycle two with stable voltage hold.
After installation, allow the device to complete its power-on self-test cycle without interruption — medical equipment runs BMS verification at startup, and interrupting this sequence causes 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

12V

Amp

4400mAh

Diversified Medical NAL8100RB — 12V Ni-MH Replacement Battery

This is a 12V, 4400mAh Ni-MH replacement battery for the Diversified Medical NAL8100RB. It fits clinical and medical equipment that depends on the original NAL8100RB battery pack. Capacity is 52.8Wh — sourced to match the original cell format and connector.

  • NAL8100RB platform fit: The NAL8100RB uses a 12V Ni-MH chemistry with a specific BMS handshake that validates cell voltage and charge state at startup. This replacement matches that voltage rail and connector footprint so the device recognises the pack without a fault flag.
  • Bench tested on actual hardware: We cycled this pack through full charge and discharge on the NAL8100RB platform. The BMS completed its verification sequence without triggering a low-battery alarm or self-test fault. Cell voltage held steady across the draw profile.
  • Post-swap startup protocol: After installing this battery, let the device complete its full power-on self-test without interruption. Medical device BMS firmware runs a voltage and chemistry verification at boot — interrupting this sequence logs a false battery fault that persists until the next clean reboot cycle.

Device not completing boot sequence after battery swap

The NAL8100RB device runs a BMS learn cycle during its first few boots with a new cell. If the pack has been in storage, cell voltage may have dropped below the BMS recovery threshold — typically around 10.5V for a 12V Ni-MH pack. The device interprets this as a faulty or depleted battery and halts the boot sequence before the self-test completes. Charge the pack fully before the first installation, then power on the device and allow the boot sequence to run to completion without interruption.

Low-battery alarm triggers immediately after confirmed full charge

This happens when the device's BMS is calibrated to OEM cell parameters and the new Ni-MH cell hasn't yet passed its internal capacity threshold. The charge IC on first charge applies a conservative current limit, so the pack may not reach the voltage ceiling the BMS expects. Run one complete charge-discharge cycle on the device before clinical use — this allows the BMS to recalibrate its capacity estimate against the new cell. After that first full cycle, the low-battery alarm threshold resets correctly.

Compatible Models

NAL8100RB

Technical Specifications

Voltage12V
Amp Hours4400mAh
Capacity4400mAh
Rate52.8Wh
Net Weight740g /26.10 oz
Gross Weight890g /31.39 oz
Approximate Weight890g /31.39 oz
Dimension 144.50 x 124.90 x 25.40mm

Product Highlights

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

Frequently Asked Questions

The NAL8100RB device shuts off unexpectedly during use even though the battery showed full — what causes this?

New Ni-MH cells deliver lower peak current in the first several cycles before internal resistance drops. The NAL8100RB's load profile during active use can pull enough current to trigger a voltage-sag cutoff on a new cell, even one that reads fully charged at rest. This typically resolves after 8–10 full charge-discharge cycles as the cells condition. Run the device through those cycles before relying on it in a clinical setting.

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

It's not faulty. The charge IC applies a reduced current ceiling when it first sees a new Ni-MH cell, which means the pack reaches a lower terminal voltage than the device expects for a full-charge indication. Complete one full charge cycle, then discharge the device under normal use, then charge again. By the second charge cycle the indicator should read 100% — if it still doesn't, check that the charging contacts are clean and fully seated.

The device passed its self-test once but now shows a battery fault on every boot after sitting unused for two weeks — what happened?

Ni-MH cells self-discharge at roughly 1–2% per day at room temperature. Two weeks of storage can drop the pack voltage enough that the NAL8100RB's BMS flags it below its minimum recovery threshold on the next boot. Place the device on charge for a full cycle before powering it on again. If the fault persists after a complete charge, power the device off, leave it on the charger for a full cycle, then power on and allow the boot self-test to complete without interruption — the BMS will re-initialise its battery state register at that point.

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