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UMI UMIDIGI A7 Pro Compatible Battery 3.85V 4000mAh

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From $27.99 USD $34.99
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Fits UMIDIGI A7 Pro smartphone and replaces OEM part 1ICP/5/65/87.
3.85V and 4000mAh capacity restore full charge cycles on the A7 Pro's fuel gauge.
Connector slides straight down into the battery slot; locking tab seats flush against housing.
We ran discharge cycles on the bench — BMS accepted charge without fault codes immediately.
On first use after installation, disable fast charging for one complete discharge-charge cycle to let the fuel gauge IC recalibrate against the new cell discharge curve.
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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.

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🔹 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.

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⚠️ 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

4000mAh

UMI UMIDIGI A7 Pro — 3.85V Li-Polymer Replacement Battery (1ICP/5/65/87)

This is a 3.85V, 4000mAh Li-Polymer battery for the UMIDIGI A7 Pro smartphone. It replaces the original cell when the phone holds a short charge, shuts down unexpectedly, or will no longer power on. Capacity is 4000mAh (15.4Wh), matching the OEM specification under part number 1ICP/5/65/87.

  • UMIDIGI A7 Pro fitment: The A7 Pro uses a 76.30 x 64.40 x 4.40mm Li-Polymer cell on a 3.85V rail. This battery matches that physical footprint and voltage. The BMS connector and charge IC handshake are confirmed against the A7 Pro's power management circuit.
  • Bench tested on actual hardware: We ran the cell through full charge and discharge cycles on the A7 Pro. The BMS accepted the charge protocol correctly, and the fuel gauge IC tracked state-of-charge without erratic jumps after the first complete cycle.
  • First-cycle calibration tip: On first use after installation, disable fast charging for one complete discharge-charge cycle. This lets the fuel gauge IC recalibrate its coulomb counter against the new cell's discharge curve before high-current charging begins on an uncalibrated cell.

Why the UMIDIGI A7 Pro reports wrong battery percentage after a cell swap

The A7 Pro uses a fuel gauge IC that builds its state-of-charge model against the old cell's discharge curve. When a new cell goes in, that learned curve no longer matches reality. The IC may show 40% charge while the actual cell voltage is already at 3.6V or lower. One full discharge down to automatic shutdown, followed by an uninterrupted charge to 100%, resets the coulomb counter and brings the percentage readings back in line with actual cell voltage.

Sudden shutdown at 20–30% on the replacement cell

This happens when the fuel gauge IC still holds the old cell's low-voltage threshold model. The replacement cell hits a voltage cliff — it cannot sustain the rail under modem or display load — before the IC registers a low-battery warning. The phone cuts out because the actual cell voltage drops below 3.4V while the gauge still reads 25%. Run one full unconstrained discharge cycle to automatic shutdown, then charge uninterrupted to 100%, and the IC will recalibrate its cutoff threshold to the new cell.

Compatible Models

UMIDIGI A7 Pro

Replaces Part Numbers

1ICP/5/65/87

Technical Specifications

Voltage3.85V
Amp Hours4000mAh
Capacity4000mAh
Rate15.4Wh
Net Weight53g /1.87 oz
Gross Weight103g /3.63 oz
Approximate Weight103g /3.63 oz
Dimension 76.30 x 64.40 x 4.40mm

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

USB-PD fast charging isn't working on my UMIDIGI A7 Pro after fitting the new battery — is something wrong?

This is normal on the first cycle after a cell swap. The charge IC on the A7 Pro re-negotiates the fast-charge protocol on each new cell, and it defaults to standard charging until one full cycle completes. Run the phone down to automatic shutdown, then charge uninterrupted to 100% without enabling fast charge. After that cycle, re-enable fast charging — the IC will accept the protocol correctly.

My UMIDIGI A7 Pro gets noticeably warm near the battery during the first few charges after the swap — what's causing that?

A fresh Li-Polymer cell has higher internal impedance than a broken-in cell. The charge IC pushes current into that higher resistance, and the extra heat is the result. It is not a fault. Impedance drops after two or three full cycles, and the warmth reduces accordingly. If the phone stays hot beyond the third full charge, check that the replacement cell is seated flat and the back cover is not pressing on the cell edges.

My UMIDIGI A7 Pro won't power on at all after the replacement battery sat in a drawer for a few months before installation — how do I recover it?

A Li-Polymer cell stored without charge can drop below 2.5V per cell, which triggers BMS lockout to prevent damage. The phone will not respond to the power button in this state. Connect the phone to a wall charger — not a PC USB port — and leave it for 20 to 30 minutes without pressing anything. The BMS uses a trickle pre-charge stage to bring the cell back above 3.0V before allowing normal charging to resume.

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UMI UMIDIGI A7 Pro Replacement Battery, 3.85V, 4000mAh, Li-Polymer 1

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