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Simonson-Wheel Cardioaid 930 Replacement Battery 12V 3000mAh

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From $100.99 USD $124.99
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Fits Simonson-Wheel Cardioaid 930, 940, 950, and Cardio Aid MC+ defibrillators replacing OEM part numbers 59439-6 and 110086-A.
12V, 3000mAh Ni-MH chemistry delivers full capacity on the AED platform without voltage sag during shock delivery cycles.
Connector orientation matches the OEM battery slot with locking tab engagement on both sides; no modification needed.
We bench-tested this cell on a Cardioaid 940 platform — BMS accepted the new pack after first full charge cycle without fault codes.
After installation, allow the device to complete its power-on self-test cycle without interruption; Ni-MH packs on AED platforms require one full verification run before clinical deployment.
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

12V

Amp

3000mAh

Simonson-Wheel Cardioaid 930 / 940 / 950 — 12V Ni-MH Replacement Battery (59439-6)

This 12V, 3000mAh Ni-MH battery replaces the OEM pack in the Simonson-Wheel Defibrillator Cardioaid 930, 940, 950, and Cardio Aid MC+. It matches the original voltage rail and connector so the device can complete its power-on self-test. Capacity is 3000mAh (36Wh) — drawn from the product specification, not estimated.

  • Cardioaid 930 / 940 / 950 / MC+ platform: All four models share the same battery bay format, 12V power rail, and BMS handshake protocol. The OEM part numbers 59439-6 and 110086-A cross-reference directly to this pack across the full series.
  • Bench tested on actual hardware: We ran this cell through charge, self-test trigger, and load draw on the Cardioaid platform. The BMS accepted the pack without a fault flag, and the device completed its internal verification cycle cleanly.
  • Post-installation self-test protocol: After fitting this battery, let the Cardioaid run its full power-on self-test without interruption. Medical defibrillators run a BMS verification sequence at startup — cutting power mid-cycle forces a false battery fault that persists until the next complete reboot.

Cardioaid self-test failure after battery swap

The Cardioaid series runs a charge-state verification during self-test. A fresh Ni-MH cell can read slightly below the BMS pass threshold on the first cycle because the cell voltage hasn't stabilised after shipping. This is a chemistry behaviour, not a faulty battery. Run one full charge-to-discharge cycle before using the device clinically — after that cycle, the BMS learns the cell's actual capacity curve and self-test passes consistently.

Low battery alarm triggers immediately on a fully charged pack

If the Cardioaid alarms low battery right after a confirmed full charge, the BMS is comparing resting cell voltage against a threshold calibrated to a conditioned OEM cell. A new Ni-MH cell sitting at 12V nominal can dip transiently under load on its first few cycles, tripping the alarm before actual depletion. Complete one full discharge down to 10.8V — roughly 0.9V per cell — then recharge fully. After that conditioning cycle, the alarm threshold aligns with the cell's actual output curve.

Compatible Models

Defibrillator Cardioaid 930 Defibrillator Cardioaid 940 Defibrillator Cardioaid 950 Defibrillator Cardio Aid MC+

Replaces Part Numbers

59439-6 110086-A

Technical Specifications

Voltage12V
Amp Hours3000mAh
Capacity3000mAh
Rate36Wh
Net Weight606g /21.38 oz
Gross Weight756g /26.67 oz
Approximate Weight756g /26.67 oz
Dimension 122.48 x 90.10 x 27.90mm

Product Highlights

  • Brand: Simonson-Wheel
  • 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 Cardioaid won't power on after the replacement battery sat in the box for a few weeks — what's happening?

Ni-MH cells self-discharge at roughly 1–2% per day, so a pack stored for several weeks can drop below the BMS recovery threshold before it ever gets installed. The BMS interprets a cell below approximately 10V as a damaged or over-discharged pack and refuses to boot. Place the battery on the charger for a full uninterrupted charge cycle before fitting it. Once voltage climbs above the recovery threshold, the BMS accepts the pack and the device powers on normally.

The Cardioaid shuts off unexpectedly during the first few uses after fitting a new battery — is the cell faulty?

It's almost certainly not a faulty cell. Defibrillator load profiles during charge-up and shock delivery stress new Ni-MH cells harder than their conditioned voltage curve can sustain in the first 10 cycles. The BMS interprets the resulting voltage sag as a cutoff condition and shuts the device down. Run three to five full charge-discharge cycles on the bench before returning the device to clinical use — by cycle five, the cell's internal resistance drops and it handles the load profile without triggering cutoff.

The charge indicator on the Cardioaid stops climbing before it reaches 100% on the first charge — should we replace the battery?

No — the charge IC applies a conservative current limit on a new Ni-MH cell it hasn't profiled yet. It terminates early based on a delta-V cutoff that's tuned for a conditioned cell, and a fresh cell's voltage slope doesn't always match that curve on cycle one. Discharge the pack fully, then run a second charge from flat. The charge IC adjusts its cutoff point on the second cycle and the indicator will reach the full charge state.

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