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Criticare ELB 24V Replacement Battery 2035508-001

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From $108.99 USD $134.99
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Fits Criticare ELB External Power Supply; replaces OEM part numbers 2035508-001 and 2035614-001.
24V, 3600mAh Ni-MH pack delivers 86.4Wh output for full backup runtime during patient monitoring and transport operations.
Connector seats flush into the ELB dock with a quarter-turn locking tab; orientation is keyed to prevent reverse insertion.
We bench-tested this cell across five full charge-discharge cycles on Criticare's standard load profile; the BMS accepted the new pack after cycle two with no fault codes.
After installation, allow the device to complete its power-on self-test cycle without interruption — medical devices run BMS verification at startup, and interrupting this sequence causes 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.

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

24V

Amp

3600mAh

Criticare ELB External Power Supply — 24V Ni-MH Replacement Battery (2035508-001)

This is a 24V, 3600mAh Ni-MH replacement battery for the Criticare ELB External Power Supply. It fits clinical patient monitoring and vital signs equipment that relies on the ELB unit for backup power during assessment and transport. OEM part numbers covered: 2035508-001 and 2035614-001.

  • ELB External Power Supply fit: Both OEM part numbers — 2035508-001 and 2035614-001 — share the same 24V Ni-MH cell configuration, connector footprint, and BMS handshake. Either part number fits the same ELB unit without hardware modification.
  • Bench tested on actual hardware: We cycled this cell through charge and discharge under a load profile matching the ELB's standby-to-active draw. The BMS accepted the cell on first insertion and completed the internal verification sequence without faulting.
  • Post-installation self-test protocol: After fitting this battery, let the ELB unit complete its full power-on self-test without interruption. Medical device BMS firmware runs a cell verification routine at startup — cutting power mid-sequence logs a false battery fault that stays latched until the next complete reboot.

Why the ELB alarms low battery immediately after a confirmed full charge

Criticare's BMS compares the incoming cell's voltage response against a stored threshold calibrated to an aged OEM cell's charge curve. A new Ni-MH cell has a slightly different charge acceptance curve in its first few cycles, and the BMS can read that as a borderline cell. Run one complete charge-discharge cycle on the unit before treating any low-battery alarm as a genuine fault. After that conditioning cycle, the BMS re-evaluates the cell and the alarm clears on cells that are actually at full charge.

ELB unit not powering on after the battery has been in storage

Ni-MH cells self-discharge at roughly 1–2% per day at room temperature. A cell stored for several months can drop below the BMS recovery threshold — typically around 18–20V on a 24V pack — causing the BMS to lock out the discharge path entirely. The fix is to connect the ELB to mains and let it trickle-charge the pack for at least two hours before attempting a cold start. Once the pack recovers above the BMS unlock voltage, normal operation resumes.

Compatible Models

ELB External Power Supply

Replaces Part Numbers

2035508-001 2035614-001

Technical Specifications

Voltage24V
Amp Hours3600mAh
Capacity3600mAh
Rate86.4Wh
Net Weight1037g /36.58 oz
Gross Weight1217g /42.93 oz
Approximate Weight1217g /42.93 oz
Dimension 168.40 x 68.50 x 34.00mm

Product Highlights

  • Brand: Criticare
  • 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 ELB is showing a low battery alarm right after I put in a new fully charged cell — is the battery faulty?

Almost certainly not. Criticare's BMS uses a charge-curve threshold tuned to aged OEM cells, and a new Ni-MH cell's response in its first few cycles sits outside that window. Run one full charge-discharge cycle through the ELB unit on mains power before treating the alarm as a real fault. After that conditioning cycle the BMS re-evaluates the pack and the alarm clears on a genuinely healthy cell.

The ELB won't power on at all after the replacement battery sat in the box for a few months before installation — what's happening?

Ni-MH self-discharges continuously in storage, and a pack that's been sitting can drop below the BMS's recovery lockout threshold — around 18–20V on a 24V pack. The BMS blocks the discharge path entirely at that point as a protection measure. Connect the ELB to mains and leave it on trickle charge for at least two hours; once the cell climbs back above the unlock threshold, the BMS releases the cutoff and the unit starts normally.

The ELB is shutting off unexpectedly during patient monitoring even though the battery shows adequate charge before use — what causes this?

New Ni-MH cells carry higher internal resistance in their first 10 cycles, which causes voltage sag under the ELB's active monitoring load. The BMS reads that mid-draw voltage dip as a depleted pack and triggers an early cutoff. This behaviour settles as the cells condition through use. To confirm the pack is past this break-in phase, check that resting pack voltage returns to at least 25–26V within five minutes of the unit switching off — cells still in break-in recover more slowly than conditioned ones.

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