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Mindray LI11I002A Medical Device Compatible Battery 3.8V 1800mAh

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From $53.99 USD $66.99
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Fits Mindray vital signs monitors and portable patient diagnostic devices; replaces OEM part number LI11I002A.
3.8V, 1800mAh lithium-polymer cell delivers 6.84Wh to sustain continuous monitoring cycles without mid-shift power loss.
Connector orientation matches original cell; verify locking tab seats flush before closing the battery compartment.
Bench testing on Mindray platform showed BMS accepted the cell after first full charge cycle completed.
Allow the device to finish its power-on self-test without interruption after installation — medical firmware validates new cell chemistry on startup, and early power-off triggers a false battery fault that persists until the next full reboot cycle.
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

3.8V

Amp

1800mAh

Mindray LI11I002A — 3.8V Li-Polymer Replacement Battery (LI11I002A)

This 3.8V, 1800mAh lithium-polymer battery replaces the Mindray OEM part LI11I002A. It fits Mindray portable patient monitoring equipment that uses this cell configuration. Voltage is 3.8V and capacity is 1800mAh (6.84Wh) — matched to the original specification.

  • Mindray monitor compatibility: Mindray portable monitors using the LI11I002A share a common power architecture — same voltage rail, connector footprint, and BMS handshake protocol. Swapping a degraded original cell for this replacement does not require firmware changes or recalibration.
  • Bench tested on actual hardware: We cycled this cell through charge and discharge on the bench with a compatible Mindray monitor. The BMS accepted the new cell, completed its initialisation handshake, and did not flag a battery fault on startup or during load.
  • First-cycle self-test requirement: After installation, allow the device to complete its power-on self-test without interrupting it. Mindray monitors run a BMS verification sequence at startup — cutting power mid-sequence triggers a false battery fault that persists until the next full reboot.

Device not completing boot sequence after battery swap

Mindray portable monitors run a power-on self-test that includes a BMS learn step. A new cell that hasn't completed one full charge-discharge cycle may not meet the BMS's internal state-of-charge threshold at boot. The monitor interprets this as an unqualified battery and stalls or loops during startup. Run one full charge-discharge cycle before placing the device back into clinical use — after that cycle, the BMS records the cell's capacity baseline and boot completes normally.

Self-test failure persisting after confirmed full charge

If the device alarms or logs a battery fault after a new cell has been fully charged, the BMS has not yet validated the cell against its stored OEM chemistry profile. This is not a defective cell — it's the BMS applying a conservative pass threshold until it completes a learn cycle. Charge the battery to full, allow the device to discharge under normal use to below 3.4V, then recharge fully. After one complete cycle the self-test clears and the fault does not return.

Replaces Part Numbers

LI11I002A

Technical Specifications

Voltage3.8V
Amp Hours1800mAh
Capacity1800mAh
Rate6.84Wh
Net Weight31g /1.09 oz
Gross Weight56g /1.98 oz
Approximate Weight56g /1.98 oz
Dimension 53.50 x 46.40 x 5.20mm

Product Highlights

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

Frequently Asked Questions

My Mindray monitor shows a low battery alarm immediately after I charged the new battery — what's happening?

The BMS in Mindray monitors is calibrated against the OEM cell's charge signature. A new replacement cell reads differently on the first charge because the BMS hasn't established a capacity baseline for it yet. This causes the monitor to alarm even when the cell is fully charged. Run one complete charge-discharge cycle — charge to full, use the device until it drops below 3.4V, then recharge — and the alarm will not repeat.

The Mindray monitor won't power on after the replacement battery sat in the packaging for a while — how do I recover it?

Lithium-polymer cells self-discharge in storage. If the cell voltage dropped below the BMS's recovery threshold (typically around 3.0V for this chemistry), the monitor's protection circuit blocks power-on entirely. Connect the device to mains power and leave it on charge for at least two hours before attempting to boot — the charge IC applies a low-current pre-charge trickle below 3.0V to bring the cell back into the normal operating window. Once voltage climbs above 3.2V, the BMS releases the lockout and the device powers on.

The Mindray monitor is shutting off unexpectedly during use in the first week after fitting the new battery — is the cell faulty?

New lithium-polymer cells have elevated internal resistance in the first 10 cycles. Under the load profile of a Mindray monitor — which spikes current during alarm events and display backlight changes — voltage sag on a new cell can momentarily dip below the BMS's undervoltage cutoff, triggering an unexpected shutdown. This is not a defective cell. Run the battery through 8 to 10 full charge-discharge cycles under normal use and the internal resistance drops, reducing sag. If shutdowns continue past cycle 10, check that the terminal voltage under load stays above 3.2V.

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