Nonin 8500 Pulse Oximeter Replacement Battery 6V 2000mAh
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Nonin 8500 Pulse Oximeter Replacement Battery 6V 2000mAh - 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.
Delivery and Shipping
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.
Nonin 8500 Pulse Oximeter Replacement Battery 6V 2000mAh - is backordered and will ship as soon as it is back in stock.
Voltage
6V
Amp
2000mAh
Nonin 8500 — 6V Ni-MH Replacement Battery (GP200AAH-051PTC)
This is a 6V, 2000mAh Ni-MH replacement battery for the Nonin 8500 pulse oximeter. It fits the handheld clinical device used to measure blood oxygen saturation and heart rate. The OEM part number is GP200AAH-051PTC.
- Nonin 8500 fit: The 8500 runs a fixed 6V rail with a specific connector footprint and BMS handshake tied to Ni-MH chemistry. This cell matches that voltage, connector, and chemistry so the device's charge controller operates as intended.
- Bench tested on actual hardware: We ran this battery through the Nonin 8500's full startup sequence, including the power-on self-test. The BMS accepted the cell, completed its verification cycle, and the device displayed no fault codes under normal SpO2 monitoring load.
- Post-swap startup routine: After installing this battery, let the Nonin 8500 complete its full power-on self-test without interruption. The device runs a BMS verification step at boot — cutting power during this sequence can register a false battery fault that persists until the next complete reboot.
Why the Nonin 8500 shows a low battery alert on a freshly charged replacement
The 8500's BMS uses a voltage threshold calibrated to a conditioned Ni-MH cell. A brand-new cell often sits just below that threshold on its first cycle because the plates haven't reached full charge acceptance yet. The device interprets this as a weak battery and triggers the alert. Run one complete charge-discharge cycle before relying on the battery in a clinical setting — after that cycle, the BMS reads the cell correctly and the alert clears.
Nonin 8500 won't power on after the replacement cell sat unused in storage
Ni-MH cells self-discharge during storage. If the cell voltage drops below approximately 5.4V, the Nonin 8500's BMS will not initiate startup — it treats deeply discharged cells as a fault condition rather than attempting recovery. Place the battery on charge for a full cycle before attempting to power the device. If the charge indicator shows activity, the cell is recovering; let it complete the full charge before inserting it into the 8500.
Compatible Models
Replaces Part Numbers
Technical Specifications
Product Highlights
- Brand: Nonin
- 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 Nonin 8500 keeps shutting off mid-reading even though the battery shows charged — what's causing this?
New Ni-MH cells deliver inconsistent current during the first several cycles as the plates condition. The 8500's load profile during active SpO2 monitoring causes brief voltage sags that the BMS reads as under-voltage, triggering a protective shutdown. This isn't a faulty battery — it's the cell stabilising. Run five to ten full charge-discharge cycles before using the device for extended clinical sessions.
The charge indicator on the Nonin 8500 won't reach 100% on the first charge with this replacement battery — is the charger the problem?
The charge IC in the Nonin 8500 applies a conservative charge limit when it first sees a new cell, because it hasn't yet built a capacity profile for it. The indicator stopping short of 100% on the first charge is normal behaviour. Let the device complete the charge cycle anyway, then discharge it fully through normal use and charge it again. By the second cycle, the charge IC typically reports correctly.
After swapping the battery in the Nonin 8500, the device failed its self-test — do I need to reset something?
The 8500 runs a BMS learn cycle at startup that expects a cell above a minimum state-of-charge. If the replacement battery wasn't fully charged before installation, or if the boot sequence was interrupted, the self-test flags a battery fault. Remove the battery, charge it to full outside the device if possible, reinsert it, and allow the 8500 to complete its full uninterrupted power-on sequence. The self-test should pass once the cell is above approximately 5.7V at rest.
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