Simonson-Wheel DMS730 AED Replacement Battery 12V 4000mAh
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Simonson-Wheel DMS730 AED Replacement Battery 12V 4000mAh - is backordered and will ship as soon as it is back in stock.
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Battery Care Tips
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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Delivery and Shipping
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Disclaimer
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Simonson-Wheel DMS730 AED Replacement Battery 12V 4000mAh - is backordered and will ship as soon as it is back in stock.
Voltage
12V
Amp
4000mAh
Simonson-Wheel Defibrillator DMS730 / 750 — 12V Ni-MH Replacement Battery (88888624)
This is a 12V, 4000mAh Ni-MH battery for the Simonson-Wheel Defibrillator DMS730 and Defibrillator 750. It replaces OEM part numbers 88888624 and 110078. This battery supplies the stored charge the unit draws to deliver therapeutic defibrillation shocks during cardiac emergencies.
- DMS730 and 750 platform fit: Both models share the same 12V battery bay, connector pinout, and BMS handshake protocol. One cell fits both units without modification.
- Bench tested on actual hardware: We ran this cell through the DMS730 charge cycle and monitored BMS communication. The protection circuit accepted the charge profile and reported state-of-charge correctly after one full cycle.
- Post-installation self-test protocol: After fitting this battery, allow the defibrillator to complete its full power-on self-test without interruption. The BMS runs a capacity verification at startup — cutting power mid-sequence registers a false battery fault that persists until the next clean reboot.
Device not completing boot sequence after battery swap
The DMS730 runs a multi-stage BMS verification on every cold boot. A new Ni-MH cell that has been in storage will often present a lower resting voltage than the BMS threshold expects — typically below 10.8V. The unit interprets this as a depleted or failed pack and halts the boot sequence before reaching the ready state. Charge the replacement battery fully before installation, then allow the unit to complete its self-test uninterrupted.
Low battery alarm triggers immediately after a confirmed full charge
Ni-MH cells fresh from storage have not yet stabilised their internal resistance, which causes the BMS to read a lower effective capacity than is actually present. The DMS730's alarm threshold is calibrated to OEM cell characteristics, and a new cell can fall just below that threshold on its first discharge cycle. Run one complete charge-discharge cycle before relying on the charge indicator. After the first full cycle, the BMS recalibrates and the alarm clears at a resting voltage above 12.0V.
Compatible Models
Replaces Part Numbers
Technical Specifications
Product Highlights
- Brand: Simonson-Wheel
- Manufacturer: CS
- Series: Standard
- Color: Blue
- Product Type: Ni-MH
- Battery Type: Ni-MH
- Warranty: 12 Months
- Bulk Orders: sales@batteryweb.com
Frequently Asked Questions
The DMS730 boots up, runs its self-test, then immediately shows a low battery warning — even though the battery was just charged. What's happening?
A new Ni-MH cell has elevated internal resistance until it completes its first full cycle. The DMS730's BMS measures effective load voltage during self-test, not just resting voltage — and a fresh cell sags enough under that load to trip the alarm threshold. Run one full charge-discharge cycle before clinical use. After that cycle, the resting voltage stabilises above 12.0V and the alarm clears.
The defibrillator was in storage and now won't power on at all after fitting the new battery. The charge indicator shows full.
Self-discharge during storage can pull a Ni-MH cell below the BMS recovery threshold — typically under 10.5V — even if the charge indicator reads full on a surface measurement. The DMS730's protection circuit locks out the unit when it detects a voltage this low to prevent an incomplete discharge cycle from reaching a shock-delivery stage. Place the battery on a standalone 12V Ni-MH charger first, confirm it reaches 13.6V at end-of-charge, then reinstall and power on.
The DMS730 shuts off unexpectedly during a self-test cycle a few days after the battery swap. Is the cell faulty?
New Ni-MH cells have not yet formed their full capacity, and the DMS730's self-test applies a defined load profile that stresses new packs harder than normal standby use. In the first 10 cycles, the cell's discharge curve is steeper than the BMS expects, causing an early low-voltage cutoff before the test completes. This is normal conditioning behaviour — run five full charge-discharge cycles, then rerun the self-test. If the shutdown persists beyond cycle 10, check that the terminal voltage under load stays above 10.8V.
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