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UMI UMIDIGI A1 Pro Compatible Battery 3.85V 3000mAh

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Fits UMIDIGI A1 Pro smartphone; replaces OEM battery part number 1ICP/5/64/85.
3.85V nominal, 3000mAh capacity delivers full power restore to processor, modem, and display load.
Connector seats vertically into phone slot with single locking tab on left side of pack.
We bench-tested this cell against the fuel gauge IC; BMS accepted charge protocol on first cycle without fault codes.
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 discharge curve before high-current charging pushes current into an uncalibrated cell.
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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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

3.85V

Amp

3000mAh

UMI UMIDIGI A1 Pro — 3.85V Li-Polymer Replacement Battery (1ICP/5/64/85)

This is a 3.85V, 3000mAh (11.55Wh) Li-Polymer cell replacing part number 1ICP/5/64/85 in the UMIDIGI A1 Pro smartphone. It fits the original battery bay and connects via the stock flex connector. Use the capacity figure above — not third-party listings, which vary.

  • UMIDIGI A1 Pro fit: The A1 Pro uses a 3.85V nominal rail with a single-cell Li-Polymer pack at 70.62 × 56.30 × 4.30mm. This cell matches that physical envelope and voltage rail exactly, so the charge IC and BMS handshake proceed without mismatches.
  • Bench tested on actual hardware: We cycled this cell through charge and load draws that mirror the A1 Pro's modem, display, and idle states. The BMS held cutoff at the correct low-voltage threshold and accepted charge termination without error flags.
  • Fuel gauge recalibration after install: On first use after fitting this cell, disable fast charging and run one full discharge down to automatic shutdown, then charge to 100% uninterrupted. This lets the A1 Pro's fuel gauge IC map its coulomb counter against the new cell's actual discharge curve before high-current charging begins.

Why the UMIDIGI A1 Pro reports wrong battery percentage after a cell swap

The A1 Pro's fuel gauge IC stores a learned discharge curve from the original cell. When you install a new cell, that stored curve no longer matches actual cell behaviour. The gauge reads voltage and applies the old curve, so the percentage shown can be off by 10–20% in either direction. One complete discharge-charge cycle with no interruptions forces the IC to relearn the new cell's voltage-to-capacity relationship and restores accurate readings.

Sudden shutdown at 20–30% on the replacement cell

This happens when the modem or display pulls a brief high-current spike and the cell voltage drops below the BMS cutoff threshold faster than the fuel gauge expects. A new cell has higher internal impedance than a settled one, which makes voltage sag under load more pronounced in the first few cycles. The phone interprets the voltage cliff as a dead cell and shuts down even though the gauge shows charge remaining. After three to five full discharge-charge cycles, internal impedance drops and the shutdowns stop — no replacement needed.

Compatible Models

UMIDIGI A1 Pro

Replaces Part Numbers

1ICP/5/64/85

Technical Specifications

Voltage3.85V
Amp Hours3000mAh
Capacity3000mAh
Rate11.55Wh
Net Weight40.6g /1.43 oz
Gross Weight65.6g /2.31 oz
Approximate Weight65.6g /2.31 oz
Dimension 70.62 x 56.30 x 4.30mm

Product Highlights

  • Brand: UMI
  • 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 UMIDIGI A1 Pro won't turn on at all after sitting in a drawer for months — is the new battery dead too?

The original cell likely discharged below 2.5V during storage, and if the new cell arrived partially discharged, the BMS may have entered lockout to protect the cell. Connect the phone to a wall charger — not a PC USB port — and leave it for 20–30 minutes without pressing the power button. The charge IC will trickle current into the cell until voltage recovers above the BMS re-enable threshold, typically around 3.0V, after which the phone will boot normally.

Fast charging stopped working the first time I charged the replacement battery — the phone just charges slowly now.

The A1 Pro's USB charging protocol negotiation runs against the BMS on the first cycle, and a new cell's charge state can cause the charge IC to default to standard 5V/1A input rather than accepting the higher voltage profile. This is not a fault — it self-corrects. Complete one full charge to 100% at the slow rate, then unplug and reconnect with the original fast charger. The protocol handshake re-runs against a fully initialised BMS and fast charging resumes at the correct rate.

The phone feels noticeably warm near the back panel while charging the new battery — is that normal?

A new Li-Polymer cell has higher internal impedance than a cell that has completed several cycles, so the charge IC dissipates more energy as heat during the first few charges. The warmth is concentrated near the battery bay and is expected to reduce after three to five cycles as impedance settles. If the phone becomes hot enough to be uncomfortable to hold, that is above normal — check that the charger output matches the A1 Pro's rated input and that the USB cable is not a low-gauge charging-only cable. Surface temperature during normal charging should be below 40°C.

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