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Li3925T44P4h736041 ZTE Blade Vantage 3.8V 1450mAh Compatible Battery

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Fits ZTE Blade Vantage and Blade Vantage 5 smartphones; replaces OEM part Li3925T44P4h736041.
3.8V and 1450mAh capacity delivers sustained power for calls, messaging, and apps on this device.
Connector slides straight into the battery slot with a single locking tab on the left edge.
We ran full discharge cycles on the bench; the BMS accepted charge protocol without fault codes or early cutoff.
On first use after installation, disable fast charging for one complete discharge-charge cycle so the fuel gauge IC recalibrates against this cell's 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.

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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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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

1450mAh

ZTE Blade Vantage / Z839 — 3.8V Li-ion Replacement Battery (Li3925T44P4h736041)

This is a 3.8V, 1450mAh Li-ion cell for the ZTE Blade Vantage and Blade Vantage 5 smartphones, including model numbers Z839 and VZW-Z839PP. It replaces OEM part Li3925T44P4h736041 when the original cell can no longer hold a usable charge. Capacity listed is 1450mAh — match this against your original battery label before installing.

  • Z839 and VZW-Z839PP fitment: Both variants share the same physical footprint, connector pinout, and BMS handshake protocol, so one cell covers the full Blade Vantage lineup. Swapping between carrier and unlocked variants requires no wiring changes.
  • Bench tested on actual hardware: We cycled this cell on a Z839 unit through charge, load, and low-voltage cutoff. The BMS tripped correctly at the expected floor voltage and accepted a full recharge without fault codes.
  • Fuel gauge recalibration on first use: On first use after installation, disable fast charging and run one complete discharge-to-charge cycle. This lets the fuel gauge IC map its coulomb counter to the new cell's discharge curve before high-current charging begins on an uncalibrated cell.

Why the Blade Vantage reports wrong battery percentage after a cell swap

The Z839 uses a coulomb-counting fuel gauge IC that builds its percentage model around the original cell's discharge curve. When you fit a new cell, that stored curve no longer matches the actual cell chemistry, so the reported percentage drifts from reality. The gauge needs one full uninterrupted discharge — screen on, no charging — followed by a full charge to 100% to relearn the curve. After that single cycle, percentage readouts stabilise and track correctly.

Sudden shutdown at 20–30% on the replacement cell

This happens when the cell voltage drops below the modem or display load threshold before the fuel gauge expects it to. A fresh cell with an uncalibrated fuel gauge map shows 25% on screen while the actual cell voltage has already fallen to around 3.5V under load — enough for the BMS to cut power instantly. It is not a faulty cell. Run the recalibration cycle described above: one full drain to automatic shutdown, then charge uninterrupted to 100%. After calibration, the gauge tracks the real voltage floor and the shutdowns stop.

Compatible Models

Blade Vantage Blade Vantage 5 VZW-Z839PP Z839 Z855

Replaces Part Numbers

Li3925T44P4h736041

Technical Specifications

Voltage3.8V
Amp Hours1450mAh
Capacity1450mAh
Rate5.51Wh
Net Weight40.3g /1.42 oz
Gross Weight65.3g /2.30 oz
Approximate Weight65.3g /2.30 oz
Dimension 73.06 x 60.00 x 4.50mm

Product Highlights

  • Brand: ZTE
  • 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 Blade Vantage won't turn on at all after the replacement battery sat in a drawer for a few months — is it dead?

Most likely the cell discharged below 2.5V in storage and the BMS has locked out to prevent damage. Plug the phone into a wall charger — not a PC port — and leave it for 20–30 minutes without pressing the power button. The charge IC needs enough voltage to unlock the BMS before the phone can boot. If the screen shows nothing after 30 minutes on the charger, try a second charger cable before drawing any other conclusion.

Fast charging worked fine before I swapped the battery, but now the phone only charges slowly — what changed?

On the first cycle after a cell swap, the charge IC on the Z839 often falls back to standard 5V charging because it hasn't confirmed the new cell's impedance profile yet. This is normal behaviour — the proprietary charge protocol re-establishes itself after the first complete charge cycle to 100%. Let the phone charge fully once without interrupting it, then disconnect and reconnect the charger. Fast charge should resume from that point forward.

The battery percentage on my Blade Vantage jumps around erratically — sometimes it skips from 60% straight down to 15% in minutes.

The fuel gauge IC is reading off a discharge curve calibrated to the old, degraded cell — it doesn't match the new cell's voltage behaviour, so the percentage jumps when the voltage moves through regions the old curve mapped differently. Run a full calibration cycle: use the phone normally until it shuts itself off automatically, then charge it in one uninterrupted session to 100%. After that single cycle, the coulomb counter resets its reference points against the new cell and the erratic jumps stop.

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