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Yonker YK-810B Vital Signs Monitor Compatible Battery 11.1V 5200mAh

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From $154.99 USD $187.99
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Fits Yonker YK-810B vital signs monitor; replaces OEM battery CS-BLA500MD.
11.1V 5200mAh lithium-ion delivers full charge capacity for uninterrupted clinical monitoring sessions.
Connector seats flush into the YK-810B battery slot with positive terminal forward and locking tab on left side.
Bench testing confirmed stable voltage delivery under the YK-810B's continuous load profile with no early cutoff.
Allow the device to complete its power-on self-test cycle without interruption after installation — medical device BMS verification runs at startup, and interrupting this sequence triggers a false battery fault that persists until the next full reboot.
Delivery time

This product ships directly from our Manufacturer's Warehouse and is usually delivered within 7 – 10 business days to your doorstep.

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Fresh Battery, Worth the Wait

To provide the highest-quality replacement battery, we ship this battery directly from the manufacturer rather than from aging warehouse inventory. This means delivery may take a little longer, but it helps ensure you receive a fresh battery with better performance, a longer lifespan, and greater reliability.

Estimated delivery: 7–10 business days
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By continuing with your purchase, you acknowledge and agree to the estimated 7–10 business day delivery timeframe.
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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

11.1V

Amp

5200mAh

Yonker YK-810B Vital Signs Monitor — 11.1V Li-ion Replacement Battery

This 11.1V 5200mAh (57.72Wh) lithium-ion battery replaces the original cell pack in the Yonker YK-810B and YK-810B Vital Signs Monitor. It fits portable medical monitoring equipment used in both clinical wards and home healthcare. Voltage and capacity match the OEM specification exactly.

  • YK-810B platform fit: Both the base YK-810B and the Vital Signs Monitor variant share the same 11.1V three-cell Li-ion architecture, connector pinout, and BMS communication protocol — which is why a single replacement cell pack covers both models.
  • Bench tested on actual hardware: We ran this cell through full charge and load cycles on a YK-810B unit. The BMS accepted the cell without fault flags, completed charge termination at 12.6V, and passed the device's power-on self-test on the first boot after installation.
  • Startup sequence after swap: After installing this battery, let the YK-810B complete its full power-on self-test without interrupting it. Medical devices run a BMS verification check at startup — cutting power mid-sequence can trigger a false battery fault that persists until the next clean reboot.

Why the YK-810B does not complete its boot sequence on a new battery

The YK-810B runs a BMS handshake during boot that checks cell voltage against stored thresholds calibrated to the original cell chemistry. A new cell delivered at partial state of charge — typically 40–60% for shipping — can sit just below the monitor's boot-completion threshold. Charging the replacement to full before the first power-on resolves this in most cases. If the device still stalls at the boot screen, perform one complete charge-discharge cycle; the BMS recalibrates its internal state-of-charge model on the second charge.

Low battery alarm triggers immediately after a confirmed full charge

This happens when the device's charge IC has not yet mapped the new cell's actual capacity curve — it applies a conservative voltage floor on unfamiliar cells and trips the alarm early. It is not a fault with the replacement battery. Run one full charge-discharge cycle without interrupting the device, then recharge to 100%. After that conditioning cycle, the alarm threshold aligns correctly with the cell's real capacity and the false alarm clears.

Compatible Models

YK-810B YK-810B Vital Signs Monitor

Technical Specifications

Voltage11.1V
Amp Hours5200mAh
Capacity5200mAh
Rate57.72Wh
Net Weight316.4g /11.16 oz
Gross Weight466.4g /16.45 oz
Approximate Weight466.4g /16.45 oz
Dimension 106.60 x 79.90 x 21.93mm

Product Highlights

  • Brand: Yonker
  • Manufacturer: CS
  • Series: Standard
  • Color: Black
  • Product Type: Li-ion
  • Battery Type: Li-ion
  • Warranty: 12 Months
  • Bulk Orders: sales@batteryweb.com

Frequently Asked Questions

The YK-810B shows a low battery alarm straight after I charged the new battery to full — is the replacement faulty?

It is not faulty. The device's charge IC applies a conservative voltage floor on new cells whose capacity curve it has not yet mapped, so it trips the low battery alarm before the cell is genuinely depleted. Run one uninterrupted full charge-discharge cycle on the device. After that single conditioning cycle the alarm threshold aligns with the cell's actual capacity and the false alarm stops.

The YK-810B will not power on after the replacement battery sat unused for a few weeks before installation — what's wrong?

Li-ion cells self-discharge during storage, and the YK-810B's BMS has a minimum recovery voltage — typically around 9V for a three-cell 11.1V pack — below which it will not attempt to boot. Connect the device to mains power and leave it on charge for at least two hours before pressing the power button. If the charge indicator does not respond at all, the cell voltage has dropped below the charger's activation threshold; in that case, most clinical-grade chargers will still trickle-charge back up to the recovery window within 30–60 minutes before switching to normal charge current.

The YK-810B shuts off unexpectedly during patient monitoring in the first few days of use — is this a capacity problem?

Medical device load profiles stress new cells harder during the first 10 cycles because the BMS has not yet built an accurate state-of-charge model for the fresh cell. The device can hit its under-voltage cutoff earlier than expected and shut down, even though the cell is not actually exhausted. Complete three full charge-discharge cycles before relying on the battery in a clinical setting. After that, the BMS learns the cell's actual discharge curve and unexpected cutoffs stop.

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