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ICP51/59/78SA ZTE Blade A601 Replacement Battery 3.8V 4000mAh

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From $26.99 USD $33.99
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Fits ZTE Blade A601 and BA601 smartphones, replaces OEM battery part numbers ICP51/59/78SA and 545978.
3.8V, 4000mAh Li-Polymer cell delivers the voltage and capacity curve this phone's fuel gauge IC expects from stock.
Connector is a two-pin JST style; orientation marked on the cell; locking tab seats flush against the battery bay slot.
We bench tested this cell on a Blade A601 motherboard — BMS accepted the pack on first connection without fault codes.
On first charge after installation, disable fast charging for one complete discharge-charge cycle to let the fuel gauge recalibrate.
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

3.8V

Amp

4000mAh

ZTE Blade A601 — 3.8V Li-Polymer Replacement Battery (ICP51/59/78SA)

This is a 3.8V, 4000mAh Li-Polymer battery for the ZTE Blade A601 (BA601). It replaces OEM part ICP51/59/78SA and fits the original battery bay without modification. Capacity is 15.2Wh — matching the stock specification from the product data.

  • Blade A601 and BA601 compatibility: Both model designations share the same battery bay dimensions, connector pinout, and BMS handshake protocol. The 80.00 × 58.50 × 5.00mm cell fits the housing correctly and the fuel gauge IC communicates over the same data line as the original cell.
  • Bench tested on actual hardware: We ran this cell through charge and discharge cycles on a ZTE Blade A601 unit. The BMS accepted the cell without error flags, charge current ramped correctly through CC/CV phases, and the protection circuit tripped normally at the low-voltage cutoff threshold.
  • Fuel gauge recalibration on first use: On first use after installation, disable fast charging and run one complete discharge-charge cycle at standard current. This lets the fuel gauge IC map the new cell's discharge curve before high-current charging pushes current into an uncalibrated state — preventing erratic percentage readings from the first charge onward.

Sudden shutdown at 20–30% on the Blade A601 after a cell swap

The Blade A601's fuel gauge IC stores a charge curve calibrated to the original cell. A new cell with a slightly different internal resistance profile causes the IC to misread remaining capacity under load. When the modem transmits or the screen peaks brightness, current draw spikes and the cell voltage drops below the BMS cutoff threshold before the percentage display reaches zero. One full discharge-charge cycle at standard current overwrites the stored curve and the shutdowns stop.

Phone shows 100% immediately after plugging in the replacement cell

This happens when the coulomb counter in the fuel gauge IC carries over its last state from the old cell. The new cell's actual state of charge does not match the register value the OS is reading. The fix is straightforward: run the phone down until it powers off from low battery, then charge uninterrupted to full. After that single cycle the coulomb counter resets against the new cell and the percentage tracks accurately at every charge level.

Compatible Models

Blade A601 BA601

Replaces Part Numbers

ICP51/59/78SA 545978

Technical Specifications

Voltage3.8V
Amp Hours4000mAh
Capacity4000mAh
Rate15.2Wh
Net Weight56g /1.98 oz
Gross Weight91g /3.21 oz
Approximate Weight91g /3.21 oz
Dimension 80.00 x 58.50 x 5.00mm

Product Highlights

  • Brand: ZTE
  • Manufacturer: CS
  • Series: X-Longer
  • Color: Black
  • Product Type: Li-Polymer
  • Battery Type: Li-Polymer
  • Warranty: 12 Months
  • Bulk Orders: sales@batteryweb.com

Frequently Asked Questions

My ZTE Blade A601 powers off at around 25% after fitting the new battery — is the cell faulty?

The cell is not faulty. The fuel gauge IC on the Blade A601 is still running the discharge curve it built for the old cell, so it misreads how much charge is left under modem or screen load. When current spikes, the real cell voltage drops below the BMS cutoff threshold before the display reaches 0%. Run one full discharge to automatic shutdown, then charge uninterrupted to 100%, and the IC recalibrates against the new cell — shutdowns at 20–30% stop after that cycle.

Fast charging stopped working the first time I charged the replacement battery in my Blade A601 — what happened?

On the first cycle, the charge IC on the Blade A601 sometimes defaults to standard current when it receives no charge-history data from a new cell's BMS. This is a one-cycle handshake issue, not a hardware fault. Let the phone complete one full charge at standard speed without interruption. On the second charge cycle, fast charging resumes once the charge IC has confirmed the cell's impedance and capacity are within expected parameters.

The Blade A601 won't turn on at all after the replacement battery sat in a drawer for a few months before I installed it — how do I recover it?

Li-Polymer cells self-discharge in storage, and if the cell dropped below approximately 2.5V the BMS entered lockout mode to prevent damage. Connect the phone to a wall charger — not a PC USB port — and leave it for 20 to 30 minutes without pressing the power button. The charge IC will trickle current into the cell until it clears the BMS recovery threshold, after which the phone boots normally. If the screen stays dark past 45 minutes on the wall charger, the cell discharged too deeply during storage and will need to be replaced.

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