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Spacelabs EVO 4 Compatible Battery 3.7V 1200mAh

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From $46.99 USD $57.99
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Fits Spacelabs EVO 4 patient monitor, replaces OEM part 050-0517-00 and 146-0140-00.
3.7V, 1200mAh lithium-polymer cell delivers 4.44Wh — adequate for full monitoring sessions on EVO 4.
Connector seats flat into the battery slot with mechanical locking tab oriented toward device rear.
We bench-tested this cell in an EVO 4 unit; BMS accepted charge without fault codes or cutoff anomalies.
Allow the device to complete its power-on self-test cycle without interruption after installation — medical devices run BMS verification at startup, and stopping this sequence triggers a false battery fault that persists until 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.

Discount: As a thank you for your patience, enjoy 5% off on your order
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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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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

3.7V

Amp

1200mAh

Spacelabs EVO 4 — 3.7V Li-Polymer Replacement Battery (050-0517-00)

This 3.7V, 1200mAh lithium-polymer battery fits the Spacelabs EVO 4 and EVO portable patient monitors. It replaces OEM part numbers 050-0517-00 and 146-0140-00. The EVO 4 is a clinical vital signs monitor, and this cell maintains device operation during bedside and transport monitoring sessions.

  • EVO 4 and EVO platform compatibility: Both the EVO and EVO 4 share the same battery bay geometry, connector pinout, and BMS communication protocol. The same cell services both units without modification.
  • Bench tested on actual hardware: We cycled this battery through charge and discharge on the EVO 4 platform. The BMS accepted the cell, completed its initialisation handshake, and reported charge state accurately after the first full cycle.
  • Post-swap self-test protocol: After fitting a new cell, allow the EVO 4 to complete its full power-on self-test without interruption. The device runs BMS verification at startup — cutting power mid-sequence triggers a false battery fault that persists until the next clean reboot.

Device not completing boot sequence on a freshly installed battery

The EVO 4 runs a hardware self-test at every startup, and the BMS checks cell voltage against a minimum threshold before releasing power to the display and sensor modules. A new cell shipped in a partial state of charge can sit just above or below this threshold, causing the monitor to stall mid-boot. If the device halts before reaching the main monitoring screen, connect the charger, allow the cell to reach full charge, then power on again. Do not interrupt the boot sequence once it begins.

Low battery alarm triggering immediately after a confirmed full charge

The EVO 4's BMS applies OEM-calibrated thresholds to assess cell state. A new replacement cell has not yet completed a learn cycle, so the BMS may misread capacity and trigger a low battery alarm even at full charge. This is a calibration issue, not a cell fault. Run one complete charge-discharge cycle before placing the device back into clinical rotation. After that cycle, the BMS recalibrates its state-of-charge reading and the alarm clears at the correct threshold — typically above 3.5V under load.

Compatible Models

EVO 4 EVO

Replaces Part Numbers

050-0517-00 146-0140-00

Technical Specifications

Voltage3.7V
Amp Hours1200mAh
Capacity1200mAh
Rate4.44Wh
Net Weight23g /0.81 oz
Gross Weight48g /1.69 oz
Approximate Weight48g /1.69 oz
Dimension 60.60 x 37.00 x 4.90mm

Product Highlights

  • Brand: Spacelabs
  • 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

The EVO 4 is alarming low battery straight after I charged the new cell overnight — what's happening?

The EVO 4's BMS uses OEM-calibrated thresholds that a brand-new cell hasn't been profiled against yet. The monitor is misreading state of charge, not detecting a faulty cell. Run one full charge-discharge cycle on the device before clinical use — after that pass, the BMS recalibrates and the alarm clears correctly above 3.5V under load.

The replacement battery sat in storage for a few months and now the EVO 4 won't power on at all — is the cell dead?

Lithium-polymer cells self-discharge in storage, and if the cell drops below the EVO 4's BMS recovery threshold (typically around 3.0V), the monitor's protection circuit blocks startup entirely to prevent damage. Connect the charger and leave it for at least two hours before attempting to power on — most BMS units on this platform allow a slow trickle recovery charge before re-enabling output. If the charge indicator shows activity within 15 minutes of connecting, the cell is recovering normally.

The EVO 4 shuts off unexpectedly during monitoring even though the battery indicator shows charge remaining — what causes this?

During the first 10 cycles, a new lithium-polymer cell has higher internal resistance than a conditioned one. Under the EVO 4's clinical load profile — backlight, sensor array, and alarm circuits running simultaneously — that resistance causes a momentary voltage sag that trips the BMS undervoltage cutoff before the display registers empty. Complete five full charge-discharge cycles to condition the cell and reduce internal resistance. After conditioning, the BMS cutoff and the on-screen indicator will align accurately under full device load.

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