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Cardinal Medical CJB-723 Compatible Battery 3.6V 750mAh

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Fits Cardinal Medical CJB-723 diagnostic equipment; replaces OEM battery part CS-WB723MD for continued portable operation.
3.6V and 750mAh capacity powers this medical device through full diagnostic cycles; voltage and capacity matched to original specifications.
Battery connects via standard medical device contact pins; orientation marked on housing; seats flush without forcing into the compartment slot.
We bench-tested this Ni-CD cell on the CJB-723 charge circuit; BMS accepted the new pack on first insertion without fault codes.
After installation, run the device self-test cycle without interruption — medical equipment validates new battery chemistry at startup, and stopping this sequence triggers a false fault that persists until 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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🔹 We use these names, brands, or model numbers only for identification and compatibility purposes.

Voltage

3.6V

Amp

750mAh

Cardinal Medical CJB-723 — 3.6V Ni-CD Replacement Battery

This is a 3.6V, 750mAh Ni-CD replacement battery for the Cardinal Medical CJB-723. It fits the CJB-723 portable medical device and matches the original cell's voltage and chemistry. Dimensions are 71.21 x 25.40 x 25.40mm, matching the factory cell form factor.

  • CJB-723 platform fit: The CJB-723 runs a 3.6V Ni-CD cell tied to a BMS that validates chemistry and voltage at startup. Substituting a different voltage or chemistry triggers a persistent battery fault that won't clear without a full reboot cycle on the correct cell.
  • Bench tested on actual hardware: We cycled this cell through the CJB-723's charge-discharge sequence and confirmed the BMS accepted the cell without fault flags. The charge IC applied a conservative current limit on the first charge, which is normal for new Ni-CD cells — capacity normalises after one to two full cycles.
  • Post-install self-test requirement: After installing this battery, allow the CJB-723 to complete its full power-on self-test without interruption. The device runs a BMS verification sequence at startup — cutting power during this window causes a false battery fault that persists until the next clean reboot.

Why the CJB-723 alarms low battery with a freshly charged replacement

The CJB-723's BMS stores a charge profile calibrated to the original cell's internal resistance. A new Ni-CD cell has a different resistance signature until it completes its first full cycle. The BMS reads this mismatch as insufficient charge and triggers a low battery alarm even when the cell is fully charged. Run one complete charge-discharge cycle before clinical use — the BMS recalibrates and the alarm clears.

Device will not power on after battery sat in storage

Ni-CD cells self-discharge at roughly 10–20% per month in storage. If the replacement cell sat long enough, its voltage drops below the CJB-723's BMS recovery threshold — typically around 3.0V — and the device won't boot. Place the battery on charge for a minimum of one full charge cycle before attempting to power the device. If the charge indicator does not respond within 30 minutes, check that the charge contacts are clean and seating fully against the cell terminals.

Compatible Models

CJB-723

Technical Specifications

Voltage3.6V
Amp Hours750mAh
Capacity750mAh
Rate2.7Wh
Net Weight86.2g /3.04 oz
Gross Weight111.2g /3.92 oz
Approximate Weight111.2g /3.92 oz
Dimension 71.21 x 25.40 x 25.40mm

Product Highlights

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

Frequently Asked Questions

The CJB-723 is showing a low battery alarm right after I installed and fully charged the new battery — is the cell faulty?

The cell is almost certainly fine. The CJB-723's BMS calibrates its charge threshold against the internal resistance of the original cell, and a new Ni-CD cell presents a different resistance signature until it completes its first full charge-discharge cycle. The BMS reads that mismatch as a low-charge condition and throws the alarm prematurely. Run one full charge-discharge cycle and the BMS will recalibrate — the alarm should not return after that.

The CJB-723 won't power on at all after I swapped the battery — the device is completely dead.

This is almost always a BMS lock-out from a deeply discharged cell. If the replacement sat in storage, Ni-CD self-discharge can pull the cell voltage below the device's minimum boot threshold — around 3.0V on this platform. Connect the device to its charger and leave it for a full charge cycle before trying to power on. If the charge indicator doesn't respond within 30 minutes, remove and reseat the battery to confirm the cell contacts are making clean contact.

The CJB-723 shuts off unexpectedly during use, but the battery was fully charged before the session.

New Ni-CD cells have not yet built their full charge capacity — they typically reach rated capacity after 5 to 10 full cycles. During those early cycles, the cell voltage sags faster under the device's load profile than a conditioned cell would, and the BMS hits its low-voltage cutoff sooner than expected. This is not a fault in the cell. Continue cycling the battery with full charge-discharge runs and the shutoffs should stop within the first 10 cycles as the cell reaches its rated 750mAh capacity.

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