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Compat Ella 12272020 Feeding Pump Compatible Battery 3.7V 5000mAh

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From $58.99 USD $72.99
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Fits Compat Ella model 12272020 feeding pump, replaces OEM part 52871.
3.7V, 5000mAh lithium-ion cell powers the pump motor and control board through full infusion cycles without mid-delivery power loss.
Connector type matches OEM housing with positive and negative contact alignment verified on the 12272020 dock connector.
We bench-tested this cell in the 12272020 charging cradle — BMS accepted the new pack on first insertion, load current stable across three full charge-discharge runs.
After installation, allow the device to complete its power-on self-test cycle without interruption; medical devices verify battery chemistry at startup, and stopping this sequence triggers a false fault that persists until 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

3.7V

Amp

5000mAh

Compat Ella 12272020 Feeding Pump — 3.7V Li-ion Replacement Battery (52871)

This 3.7V, 5000mAh Li-ion battery replaces OEM part 52871 in the Compat Ella 12272020 portable feeding pump. It matches the original cell's voltage rail and connector format. Install it when the original pack no longer holds a charge through a full feed cycle.

  • Compat Ella 12272020 feeding pump fit: The 12272020 platform uses a single-cell 3.7V architecture with a BMS that handshakes on connector insertion. This replacement uses the same pin configuration and cell chemistry, so the pump's charge controller recognises it without throwing a fault code.
  • Bench tested on actual hardware: We ran charge-discharge cycles on this cell using the 12272020's native charge IC. The BMS accepted the cell on first insertion, passed the internal resistance check, and cycled through full charge without tripping the overcurrent cutoff.
  • Post-swap self-test protocol: After installing this battery, let the Compat Ella 12272020 complete its full power-on self-test without interrupting it. The device's BMS runs a chemistry verification at startup — cutting power mid-sequence locks in a false battery fault that won't clear until the next complete reboot.

Device not completing boot sequence on new battery

The 12272020 runs a BMS learn cycle during its first boot with a new cell. If the device stalls or restarts partway through, the pump's firmware logs the battery as uncertified and blocks normal operation. This isn't a faulty cell — it's the BMS waiting for baseline data it never received. To clear it, perform one full charge to 100%, then power the device on and leave it undisturbed through the entire startup sequence.

Charge indicator stalls below 100% on the first charge

On the first charge after installation, the Compat Ella's charge IC applies a conservative current limit to an unrecognised cell — this is normal behaviour, not a fault. The indicator may plateau at 85–95% for an extended period before completing. Do not disconnect the charger early. Let the charge cycle finish fully; the IC recalibrates its limit once it has logged the cell's first full charge curve, and subsequent charges will reach 100% faster.

Compatible Models

12272020 feeding pump

Replaces Part Numbers

52871

Technical Specifications

Voltage3.7V
Amp Hours5000mAh
Capacity5000mAh
Rate18.5Wh
Net Weight74g /2.61 oz
Gross Weight99g /3.49 oz
Approximate Weight99g /3.49 oz
Dimension 74.00 x 22.00 x 22.00mm

Product Highlights

  • Brand: Compat Ella
  • 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 Compat Ella 12272020 is alarming low battery immediately after I fully charged the new battery — what's happening?

The pump's BMS compares the new cell against an OEM chemistry baseline stored in firmware. Until the cell completes one full charge-discharge cycle, it won't pass that threshold, so the alarm fires even though the cell is full. Run one complete cycle — full charge, then let the pump draw it down through normal use — and the alarm should clear. If it persists after two full cycles, check that the cell voltage at rest reads at least 3.6V before contacting a biomedical technician.

The Compat Ella 12272020 won't power on at all after the replacement battery sat in storage for a few weeks before installation — how do I recover it?

Li-ion cells self-discharge in storage, and the 12272020's BMS has a minimum recovery threshold of approximately 3.0V — below that, it blocks power-on as a protection measure. Connect the pump to mains power and leave it on charge for at least two hours before attempting to turn it on. The charge IC applies a trickle current first to bring the cell back above the BMS recovery threshold, then switches to normal charge. Do not attempt repeated power-on presses during this window.

The Compat Ella 12272020 is shutting off unexpectedly during feeds after the battery swap — is this a BMS trip?

New cells have slightly higher internal resistance in the first 10 charge-discharge cycles, and the feeding pump's load profile creates brief current spikes that can trip the BMS overcurrent cutoff before the cell has broken in. Each unexpected shutoff is a protective cutoff, not a cell fault. Complete five to ten full charge-discharge cycles under normal use conditions and the shutoff frequency should drop sharply. If the device still cuts out after ten cycles, measure resting cell voltage — it should be stable at 3.7V between feeds.

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