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SCP-41LBPS BoostMobile Milano Replacement Battery 3.7V 1400mAh

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From $23.99 USD $29.99
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Fits BoostMobile Milano and C5120 models, replacing OEM battery SCP-41LBPS or SCP-42LBPS.
3.7V lithium-ion cell at 1400mAh delivers 5.18Wh — sufficient for a full day of calls, messaging, and standard app use on the Milano platform.
Connector seats flush into the Milano battery slot with positive contact on the right; locking tab clips down without force to secure the cell.
We bench-tested this pack on a Milano C5120 charging circuit — BMS settled after one full discharge-charge cycle, voltage held steady under GSM load.
On first use after installation, run one complete discharge-charge cycle with fast charging disabled to let the fuel gauge IC recalibrate against this cell's discharge curve.
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

1400mAh

BoostMobile Milano C5120 — 3.7V Li-ion Replacement Battery (SCP-41LBPS)

This 3.7V Li-ion cell replaces the original battery in the BoostMobile Milano and C5120 smartphones. Capacity is 1400mAh (5.18Wh), matching OEM part numbers SCP-41LBPS and SCP-42LBPS. It restores power to calls, messaging, and apps on a degraded or failed original cell.

  • Milano and C5120 compatibility: Both model designations share the same battery bay dimensions, connector pinout, and BMS handshake protocol — this cell fits either variant without modification.
  • Bench tested on actual hardware: We ran this cell through full charge and discharge cycles on the Milano platform. The BMS accepted the cell without error flags, and charge termination triggered correctly at 4.2V.
  • Fuel gauge recalibration on first use: On first use after installation, disable fast charging for one complete discharge-charge cycle. This lets the fuel gauge IC recalibrate against the new cell's discharge curve before high-current charging pushes current into an uncalibrated cell.

Why the Milano reports wrong battery percentage after a cell swap

The Milano uses a fuel gauge IC that builds its charge model against the original cell's impedance and discharge curve. When you install a new cell, that model no longer matches reality, so the percentage readout drifts. The IC needs one full discharge-to-charge cycle to re-map the coulomb counter against the new cell. Until that cycle completes, percentage jumps and inaccurate readings are expected — not a fault with the replacement cell.

Sudden shutdown at 20–30% remaining on the replacement cell

This happens when the modem or display draws a high current spike and the cell voltage drops below the BMS cutoff threshold — even though the fuel gauge still shows charge remaining. The fuel gauge IC is reading an uncalibrated curve and overestimates remaining capacity. Complete one full uninterrupted discharge cycle down to automatic shutoff, then charge to 100% without interruption. After that cycle, the coulomb counter resets and the shutdown-under-load behaviour typically resolves.

Compatible Models

Milano C5120 Milano C5120

Replaces Part Numbers

SCP-41LBPS SCP-42LBPS

Technical Specifications

Voltage3.7V
Amp Hours1400mAh
Capacity1400mAh
Rate5.18Wh
Net Weight28g /0.99 oz
Gross Weight53g /1.87 oz
Approximate Weight53g /1.87 oz
Dimension 65.20 x 44.00 x 5.10mm

Product Highlights

  • Brand: BoostMobile
  • 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 Milano powers on but shuts off the moment I open the camera or make a call — battery shows 25% still. What's happening?

This is a voltage cliff — under the sudden current draw of the modem or camera module, the new cell's voltage dips below the BMS cutoff threshold faster than the fuel gauge predicts. The fuel gauge IC is still calibrated to your old cell's discharge curve, so it overestimates remaining capacity. Run one full discharge cycle down to automatic shutoff, then charge uninterrupted to 100%. That recalibrates the coulomb counter and eliminates the premature cutoff.

My Milano won't power on at all after the replacement battery sat in a drawer for a few months. Is the cell dead?

Most likely the cell discharged below 2.5V during storage, which triggered BMS lockout — a protective state that blocks normal charge acceptance to prevent charging a deeply discharged lithium cell unsafely. Connect the phone to a wall charger and leave it for 20–30 minutes without pressing the power button; the charge IC will trickle current into the cell until it rises above the BMS re-enable threshold. Once voltage recovers above roughly 3.0V, normal charging resumes and the phone should power on.

Fast charging stopped working after I installed this battery — the phone charges, just very slowly. Why?

On the first cycle after a cell swap, the USB charge controller on the Milano may not negotiate the faster charge profile until the BMS has completed one baseline charge cycle on the new cell. This is normal behaviour — the controller defaults to standard current until it has a valid BMS handshake. Complete one full charge at the slow rate, disconnect, then reconnect to your fast charger. The protocol negotiation typically succeeds from the second cycle onward.

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