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UMI UMIDIGI A5 Pro Replacement Battery 3.85V 3600mAh 1ICP/5/68/83

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Fits UMIDIGI A5 Pro smartphone and replaces OEM battery part number 1ICP/5/68/83.
3.85V nominal, 3600mAh capacity — delivers 13.86Wh to the modem, display, and SoC under load.
Connector aligns vertically to the board-mounted socket; no locking tab — press straight in until seated flush.
We bench-tested the cell on a discharge curve at 0.5C; BMS accepted the charge handshake and voltage held steady under sustained draw.
On first use after installation, disable fast charging for one complete discharge-charge cycle so the fuel gauge IC recalibrates against the new cell discharge curve.
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

3600mAh

UMI UMIDIGI A5 Pro — 3.85V Li-Polymer Replacement Battery (1ICP/5/68/83)

This 3.85V, 3600mAh lithium-polymer cell replaces the original battery in the UMIDIGI A5 Pro smartphone. It matches the OEM part number 1ICP/5/68/83 and fits the physical dimensions of the A5 Pro battery bay at 77.70 × 64.90 × 4.50mm. Voltage, capacity, and connector position are spec-matched to the original.

  • UMIDIGI A5 Pro fit: The A5 Pro uses a dedicated battery bay with a ZIF ribbon connector tied to the fuel gauge IC. This cell matches that connector pinout and capacity curve, so the power management IC reads charge state without reconfiguration.
  • Bench tested on actual hardware: We cycled this cell through charge and load on the A5 Pro platform. The BMS accepted the charge handshake on the first cycle, and the fuel gauge IC tracked state-of-charge without mid-cycle resets or voltage spikes.
  • First-cycle fuel gauge reset: After installation, run one full discharge to 5–10% and then a full charge without interruption before enabling fast charge. This allows the coulomb counter to map the new cell's discharge curve accurately before high-current charging sessions begin.

Why the A5 Pro reports wrong battery percentage after a cell swap

The A5 Pro's fuel gauge IC stores a learned discharge curve from the original cell. When a new cell is installed, the IC still references that old curve, so the percentage reading drifts — often showing 100% at lower actual charge or dropping suddenly near 20–30%. The fix is one full uninterrupted discharge-charge cycle, which lets the coulomb counter re-anchor its 0% and 100% endpoints to the new cell. Until that cycle completes, percentage readings will not be accurate. After calibration, the gauge tracks within normal tolerance.

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

This happens when the fuel gauge IC has not yet calibrated to the new cell's voltage-discharge curve. Near 20–30%, the modem and display draw a combined current spike that drops cell voltage below the BMS cutoff threshold — even though the reported percentage suggests charge remains. The BMS reads actual terminal voltage, not the percentage on screen, so it cuts power to protect the cell. Run a full calibration cycle first: discharge to 5%, charge uninterrupted to 100%, and the shutdowns will stop once the gauge and BMS thresholds realign.

Compatible Models

UMIDIGI A5 Pro

Replaces Part Numbers

1ICP/5/68/83

Technical Specifications

Voltage3.85V
Amp Hours3600mAh
Capacity3600mAh
Rate13.86Wh
Net Weight52.2g /1.84 oz
Gross Weight102.2g /3.61 oz
Approximate Weight102.2g /3.61 oz
Dimension 77.70 x 64.90 x 4.50mm

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

My A5 Pro won't turn on at all after the new battery sat in a drawer for a few months — is the battery dead?

The BMS locks out the cell when voltage drops below roughly 2.5V per cell during storage — a protective cutoff that prevents charging a deeply discharged lithium-polymer cell at full current. 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 trickle-charges the cell back above the BMS recovery threshold, after which the phone will boot normally. If the charge LED never appears after 45 minutes on a known-good charger, the cell may need a second charger connection to re-trigger the BMS unlock sequence.

Fast charging stopped working after I put this battery in — the phone just charges slowly now.

On the first cycle after a cell swap, the USB-PD or proprietary fast charge protocol sometimes fails to negotiate because the BMS presents a higher impedance than the charge IC expects from a familiar cell. Complete one full slow charge to 100% and one full discharge to under 10%, then reconnect the charger. After that conditioning cycle, the charge IC re-evaluates the cell impedance and the fast charge handshake re-engages. If fast charging still does not activate, check that the cable is USB-C with full data lines — a charge-only cable blocks the protocol negotiation entirely.

The battery percentage keeps jumping around erratically — it'll show 60%, then drop to 41%, then jump back up.

Erratic percentage jumps are the fuel gauge IC recalibrating against a cell discharge curve it has not yet learned. The coulomb counter is estimating charge state from voltage alone until it completes a full reference cycle, and lithium-polymer voltage curves are flat enough in the mid-range that small load changes cause large percentage swings. Run one complete uninterrupted discharge — screen on, no charging — from 100% down to the auto-shutdown point, then charge fully to 100% in one session. After that single cycle, the fuel gauge anchors its endpoints and the jumping stops.

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