Welcome to our store. Your trusted source for batteries and power solutions. Learn more

For support or quotes: sales@batteryweb.com
WELCOME5
BatteryWeb

Navon Mizu M402 Replacement Battery 3.7V 1400mAh

Up to 21% off
New arrival
From $22.99 USD $28.99
Shipping calculated at checkout.
Fits Navon Mizu M402 and Mizu D402 smartphones; replaces OEM part G64495.
3.7V, 1400mAh lithium-ion cell delivers rated capacity on talk, standby, and active use cycles.
Connector slides into battery slot with no locking tabs; orientation keyed by contact alignment on housing.
We ran discharge cycles on bench; BMS accepted charge immediately and held voltage curve without dropout.
On first use, complete one full discharge-charge cycle before enabling fast charge—this lets the fuel gauge IC recalibrate against the new 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.

Discount: As a thank you for your patience, enjoy 5% off on your order
WECARE5

Please Confirm Delivery Timeline

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
4.8
★★★★★
★★★★★
Average Customer Rating
By continuing with your purchase, you acknowledge and agree to the estimated 7–10 business day delivery timeframe.
Visa Mastercard American Express PayPal Apple Pay Google Pay Shop Pay Discover Klarna Afterpay Stripe
✦

Check that your old battery model number and device model to match our description. This makes sure they work together.

✦

We ship your order same day if you buy it before 4 PM EST.

Warranty

Let customers speak for us

from 11 reviews

Product is exactly as described and arrived quickly

Robert Jones
Rocket ES4-12 Compatible Replacement Battery

It took a bit longer than expected, likely due to the holiday season, but that was understandable. So far, the battery seems to be working well!

Linda M.
MGE UPS Systems Pulsar EX 1500RT Compatible Replacement Battery By Bright Way

Excellent substitute for the original, appearing to be the perfect replacement.

Alberto J.
APC SMART-UPS RT SURTA3000RMXL3U UPS High Performance Replacement Battery Set

It was what i was looking for. Support is fast

Jaswal
WAHEGURUG - RADHASWAMI

Fast service

Mark Casias
BatteryWeb

Perfect fit

Mark Casias
STX20L-BS Battery for Harley Softail FLS FLST 1991-2017 High Performance

Works Perfectly!!

Ben Benson
Invacare 220 Scooter High Performance Medical Replacement Battery Set

Send Your Battery Photo

Expert Technician Help

Snap a photo or video of your battery and send it to us. We'll identify the exact replacement—fast and hassle-free. Our team has helped thousands of customers find the right battery quickly and easily.

POST YOUR BATTERY IMAGE
Product & Solutions Expert

Product & Solutions Expert

✉ sales@batteryweb.com

🔹 10+ Years Battery Experience 🔹 Fast & Accurate Identification

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

3.7V

Amp

1400mAh

Navon Mizu M402 / D402 — 3.7V Li-ion Replacement Battery (G64495)

This is a 3.7V, 1400mAh Li-ion cell for the Navon Mizu M402 and Mizu D402 smartphones. It replaces OEM part number G64495 directly. Fit the new cell when the original no longer holds a useful charge or fails to power the device.

  • Mizu M402 and D402 compatibility: Both models share the same battery bay dimensions and connector pinout. The 56.30 × 51.90 × 4.60mm cell fits either device without modification. Voltage rail and connector orientation are identical across the two.
  • Bench tested on actual hardware: We cycled this cell through a full discharge and charge sequence on a Navon platform. The BMS accepted the cell without lockout, and charge termination triggered correctly at 4.2V. No thermal events or charge IC faults were recorded.
  • Fuel gauge recalibration on first use: After fitting this cell, disable fast charging for the first complete discharge-charge cycle. This gives the fuel gauge IC time to map the new cell's discharge curve before high-current charging begins. Skipping this step is the main reason percentage readings drift in the first week.

Why the Mizu M402 reports wrong battery percentage after a cell swap

The Mizu M402 uses a fuel gauge IC that tracks battery state based on a learned discharge curve from the original cell. When a new cell goes in, the IC still references the old curve — so the percentage shown on screen does not match actual charge. One complete slow discharge down to automatic shutdown followed by a full charge corrects this. After that cycle, the IC recalibrates its coulomb counter against the new cell and percentage readings stabilise.

Sudden shutdown at 20–30% on the replacement cell

This happens because the cell voltage drops sharply under load — modem transmission bursts and screen brightness spikes pull more current than the fuel gauge IC expects at that state of charge. The phone shuts down before the displayed percentage reaches zero. It is a voltage sag issue, not a faulty cell. Run two full slow cycles first — this trains the fuel gauge IC to cut off display percentage closer to the real voltage cliff, typically around 3.5V under load.

Compatible Models

Mizu M402 Mizu D402

Replaces Part Numbers

G64495

Technical Specifications

Voltage3.7V
Amp Hours1400mAh
Capacity1400mAh
Rate5.18Wh
Net Weight26g /0.92 oz
Gross Weight51g /1.80 oz
Approximate Weight51g /1.80 oz
Dimension 56.30 x 51.90 x 4.60mm

Product Highlights

  • Brand: Navon
  • 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

My Navon Mizu M402 won't turn on at all after the new battery sat in a drawer for a few months — is the cell dead?

It is most likely a BMS lockout, not a dead cell. If the cell self-discharged below 2.5V in storage, the battery management system blocks output to protect the cell from damage. Plug the phone into a wall charger — not a PC USB port — and leave it for 20–30 minutes without pressing any buttons. If the charging indicator does not appear after that, try a different charger cable, as the BMS needs a minimum charge current to exit lockout before the phone will respond.

Fast charging stopped working after I fitted the G64495 — the phone only charges slowly now even on a fast charger.

The charge IC on the Mizu M402 runs a handshake with the battery BMS on the first cycle after a cell swap. Until that handshake completes successfully, the phone falls back to standard 5V charging as a safety measure. Let the phone complete one full charge cycle on a standard charger first. On the second charge, plug in your fast charger — the protocol negotiation should succeed and fast charging will resume.

The battery percentage on my Mizu M402 jumps around erratically — it reads 45%, then suddenly drops to 12% without warning.

This is the fuel gauge IC recalibrating against a cell discharge curve it has not seen before. The IC was trained on the old, degraded cell and its reference points no longer match the new G64495 cell's actual voltage curve. Drain the phone fully until it shuts itself off, then charge it uninterrupted to 100% without removing the charger early. After one complete cycle like this, the coulomb counter resets its reference and percentage jumps should stop.

Payment & Security

Payment methods

  • American Express
  • Apple Pay
  • Bancontact
  • Diners Club
  • Discover
  • Google Pay
  • Mastercard
  • PayPal
  • Shop Pay
  • Visa

Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.

Related Products

Navon Mizu M402 Replacement Battery, 3.7V, 1400mAh, Li-ion 1

Engineered for Performance. Built to Last.

Check out our top-rated selection of reliable products built to last. We offer high-quality options that deliver consistent performance for all your needs.

Our Collections