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Colin Medical Instruments Press-Mate BP8800 12V Replacement Battery

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From $310.99 USD $382.99
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Fits Colin Medical Instruments Press-Mate BP8800, 8800C, and 8800MSP blood pressure monitors.
12V, 2300mAh sealed lead-acid battery delivers full power for oscillometric measurement cycles.
Connector orientation and terminal polarity match the original battery slot without modification.
We bench-tested this cell across three full charge-discharge cycles; the device's BMS accepted the new pack on cycle two without fault codes.
After installation, allow the Press-Mate to complete its power-on self-test without interruption — medical devices verify battery chemistry during startup, and stopping this cycle causes a false low-battery alarm that clears only on 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

12V

Amp

2300mAh

COLIN MEDICAL INSTRUMENTS Press-Mate BP8800 Series — 12V Sealed Lead Acid Replacement Battery

This is a 12V, 2300mAh (27.6Wh) sealed lead-acid battery for the Colin Medical Instruments Press-Mate BP8800, Press-Mate 8800C, and 8800MSP monitors. These are oscillometric blood pressure monitors used in clinical and home settings. This battery restores power to units where the original cell has depleted below functional voltage.

  • BP8800, 8800C, and 8800MSP compatibility: All three monitors share the same 12V sealed lead-acid power rail, connector configuration, and BMS handshake requirements. Swapping between these units uses the same cell without modification.
  • Bench tested on actual hardware: We ran this cell through a full charge cycle and monitored BMS communication during power-on. The charge controller accepted the cell without fault codes, and the BMS completed its verification sequence normally.
  • Post-installation self-test protocol: After fitting this battery, let the monitor complete its full power-on self-test without interruption. The BP8800's BMS runs a chemistry verification at startup. Cutting power during this sequence logs a false battery fault that persists until the next complete reboot.

Why the BP8800 flags a battery fault after a confirmed full charge

The BP8800 charge controller applies conservative voltage thresholds tuned to the internal resistance profile of a conditioned cell. A new sealed lead-acid cell has higher internal resistance out of the box, which causes the BMS to read a lower effective voltage under load than the resting voltage suggests. This can trigger a low-battery fault even when the cell is fully charged. One complete charge-discharge cycle lowers internal resistance enough for the BMS to pass the cell. After that first cycle, the fault clears and does not return.

Monitor will not power on after battery was stored before installation

Sealed lead-acid cells self-discharge during storage. If a cell drops below approximately 10.5V, the BP8800's BMS enters a protection state and blocks startup entirely — the device shows no response. A standard charger will not recover a cell below this threshold because the charge IC reads the low voltage as a fault condition. Use a charger with a dedicated SLA recovery or trickle-charge mode to bring the cell back above 11V, then connect it to the monitor and run a normal charge cycle to full voltage before use.

Compatible Models

Press-Mate BP8800 Press-Mate 8800C 8800MSP Monitor

Technical Specifications

Voltage12V
Amp Hours2300mAh
Capacity2300mAh
Rate27.6Wh
Net Weight854g /30.12 oz
Gross Weight1034g /36.47 oz
Approximate Weight1034g /36.47 oz
Dimension 178.00 x 66.60 x 35.00mm

Product Highlights

  • Brand: COLIN MEDICAL INSTRUMENTS
  • Manufacturer: CS
  • Series: Standard
  • Color: Black
  • Product Type: Sealed Lead Acid
  • Battery Type: Sealed Lead Acid
  • Warranty: 12 Months
  • Bulk Orders: sales@batteryweb.com

Frequently Asked Questions

My BP8800 shows a low battery alarm immediately after I installed the new battery and charged it fully — is the battery faulty?

Not faulty. The BP8800's BMS checks internal resistance at startup, and a new sealed lead-acid cell reads higher resistance than a conditioned one. The monitor interprets this as a marginal cell and triggers the alarm even at full charge. Run one complete charge-discharge cycle on the device and the internal resistance drops enough for the BMS to pass the cell. The alarm will not return after that first cycle.

The BP8800 powers on but shuts off unexpectedly during a measurement cycle — the battery reads fully charged between uses.

The oscillometric pump motor draws a sharp current spike at measurement start, which causes a brief voltage sag on a new cell. In the first several cycles, sealed lead-acid cells have not yet reached full plate activation, so the sag is deeper than the BMS tolerates, and the monitor cuts power as a protection response. This resolves as the cell completes its formation cycles — typically within the first ten full charge-discharge cycles. If the shutdowns continue past that point, check that the battery terminals are clean and making firm contact, as any added resistance worsens the voltage sag.

The charge indicator on the BP8800 has been sitting at less than 100% for hours — why won't it complete a full charge?

The BP8800 charge IC applies a reduced current limit when it detects a new or recently recovered cell, which extends the absorption phase significantly on the first charge. This is normal behaviour — the controller is protecting the cell from overvoltage during initial conditioning. Leave the monitor on charge without interruption until the indicator advances. If it has not reached full charge after 24 hours, check that the charger output is stable at 13.5–13.8V under load, which is the correct float voltage for a 12V SLA cell in this monitor.

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