Ohmeda 7800 Replacement Battery 4.8V 3600mAh Ni-MH
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Ohmeda 7800 Replacement Battery 4.8V 3600mAh Ni-MH - 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
🔹 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
⚠️ 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.
Ohmeda 7800 Replacement Battery 4.8V 3600mAh Ni-MH - is backordered and will ship as soon as it is back in stock.
Voltage
4.8V
Amp
3600mAh
Ohmeda 7800 / 7810 Anesthesia Ventilator — 4.8V Ni-MH Replacement Battery (MED9125)
This is a 4.8V 3600mAh Ni-MH replacement battery for the Ohmeda 7800 and 7810 anesthesia ventilator series. It powers the control electronics and monitoring functions during anesthesia administration. OEM part numbers MED9125, OM10788, and B10788 all cross to this cell pack.
- 7800 and 7810 platform fit: Both models share the same 4.8V battery rail, connector pinout, and BMS handshake protocol — one cell pack covers the full series without modification.
- Bench tested on actual hardware: We cycled this pack through the 7800's power-on self-test and monitored BMS communication at each stage. The charge IC accepted the cell and voltage reporting stayed within the device's expected window across the full charge curve.
- Post-installation self-test protocol: After fitting this battery, allow the 7800 to complete its full power-on self-test without interruption. The device runs a BMS verification sequence at startup — interrupting it before completion triggers a false battery fault that persists until the next clean reboot.
Why the 7800 shows a battery fault after the first charge cycle
The 7800's BMS uses a threshold-based self-test calibrated to the OEM cell's charge signature. A new replacement cell — even fully charged — can read outside that learned window on the first cycle. This is a chemistry recognition issue, not a defective battery. One full charge-discharge cycle allows the BMS to map the new cell's internal resistance and voltage curve. After that cycle, the fault clears and the device reports battery status normally.
Charge indicator not reaching 100% on the first charge
On first charge, the 7800's charge IC applies a conservative current limit to an unrecognised cell — this is standard behaviour for medical-grade charge controllers protecting against overvoltage on an unknown pack. The indicator will plateau below 100% and hold there. Run the battery down to the low-battery alarm threshold, then charge uninterrupted to full. After this conditioning cycle, the charge IC accepts the cell's full 3600mAh capacity and the indicator reads correctly.
Compatible Models
Replaces Part Numbers
Technical Specifications
Product Highlights
- Brand: Ohmeda
- Manufacturer: CS
- Series: Standard
- Color: Green
- Product Type: Ni-MH
- Battery Type: Ni-MH
- Warranty: 12 Months
- Bulk Orders: sales@batteryweb.com
Frequently Asked Questions
The 7800 alarms low battery immediately after I've confirmed it's fully charged — is the new battery faulty?
The battery is not faulty. The 7800's BMS stores a charge-signature profile from the original cell, and a new Ni-MH pack reads outside that learned window until the BMS recalibrates. Run one complete charge-discharge cycle — discharge to the low-battery alarm threshold, then charge uninterrupted to full. After that single cycle, the BMS accepts the new cell's voltage curve and the alarm clears.
The 7800 won't power on after the replacement battery sat unused for several weeks before installation — how do I recover it?
Ni-MH cells self-discharge at roughly 1–3% per day, and if the pack dropped below the 7800's BMS recovery threshold (typically around 4.0V for a 4.8V pack), the device will refuse to boot. Connect the battery to the charger for a minimum of four hours before attempting to power on the unit. If the charge IC shows no activity, the cell may be below the trickle-charge entry voltage — leave it on charge for up to 12 hours, then retry.
The 7800 completed its self-test on the new battery but shuts off unexpectedly during use — what's causing it?
New Ni-MH cells have elevated internal resistance in the first 5–10 charge cycles. Under the 7800's monitoring load profile, this causes a sharper-than-expected voltage sag that the BMS interprets as a depleted cell and triggers a protective shutdown. This is not a fault — it resolves as the cells condition through repeated cycles. Run three to five full charge-discharge cycles before placing the unit in clinical rotation, and verify the pack reaches at least 4.6V under load before clearing it for use.
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