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Amazfit GTR 4 47mm Compatible Battery 3.87V 470mAh PL412631

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Fits Amazfit GTR 4 47mm smartwatch and replaces OEM battery part number PL412631.
3.87V, 470mAh lithium-polymer cell restores multi-day runtime to this GPS fitness watch.
Connector clips onto the watch mainboard; alignment tab on cell edges prevents reverse insertion.
We bench-tested this cell on a GTR 4 mainboard — BMS accepted charge without fault codes.
After fitting, place the watch on its charger immediately and run to 100% — the fuel gauge IC cannot calibrate without a full charge cycle from near-zero after cell swap.
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This product ships directly from our Manufacturer’s Warehouse and is usually delivered within 5 – 8 business days to your doorstep.

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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.

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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

3.87V

Amp

470mAh

Amazfit GTR 4 47mm — 3.87V Li-Polymer Replacement Battery (PL412631)

This is a 3.87V, 470mAh lithium-polymer cell for the Amazfit GTR 4 47mm smartwatch. It replaces part number PL412631 and fits the 47mm case only — not the GTR 4 Mini or any other GTR variant. Swap it when the original cell no longer holds charge through a full day of GPS and heart rate tracking.

  • GTR 4 47mm fit: The GTR 4 47mm uses a dedicated cell footprint — 31.40 x 25.90 x 4.00mm — with a specific flex connector keyed to the watch's power management IC. Only cells matching PL412631's dimensions and connector pinout will seat correctly without stressing the ribbon cable.
  • Bench tested on actual hardware: We ran the cell through charge and discharge cycles on the GTR 4 platform and confirmed the BMS accepted the new cell without throwing a low-voltage lockout or refusing the charge handshake at the PMIC.
  • Post-swap charge calibration: After fitting this cell, place the watch on its magnetic charger immediately and charge it to 100% before using it. The GTR 4's fuel gauge IC loses its reference point when the old cell is disconnected — without a full charge cycle from near-zero, the percentage readout will be inaccurate for days.

Why the GTR 4 fuel gauge reads wildly wrong after a cell swap

The GTR 4 uses a coulomb-counting fuel gauge IC that tracks charge state by measuring current flow in and out of the cell over time. When you disconnect the old battery, the IC loses that accumulated reference entirely. It then estimates state-of-charge from open-circuit voltage on the new cell, which gives a rough and often wrong starting number. A single full charge cycle — from near-zero to 100% without interruption — lets the IC reset its baseline and restore accurate readings.

Magnetic charge contacts not connecting after reassembly

If the watch sits on the charger but shows no charging indicator, the rear contact pads have likely shifted during back-cover reassembly. Even a fraction of a millimetre of misalignment breaks the magnetic contact circuit. Remove the back cover, reseat the battery connector fully, and refit the cover so all four corner clips engage flush. Then place the watch on the charger and confirm the charging icon appears within five seconds.

Compatible Models

GTR 4 47mm

Replaces Part Numbers

PL412631

Technical Specifications

Voltage3.87V
Amp Hours470mAh
Capacity470mAh
Rate1.82Wh
Net Weight8g /0.28 oz
Gross Weight33g /1.16 oz
Approximate Weight33g /1.16 oz
Dimension 31.40 x 25.90 x 4.00mm

Product Highlights

  • Brand: Amazfit
  • 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 GTR 4 shows 0% and won't turn on right after I fitted the new battery — did I get a dead cell?

The cell is almost certainly fine. The GTR 4's fuel gauge IC loses its charge reference the moment the old battery is disconnected, and it often reads 0% on a new cell until a calibration cycle runs. Place the watch on its magnetic charger straight away and leave it charging uninterrupted to 100% — the display should light up within a minute of connecting, and the percentage will stabilise over that first full charge.

The replacement battery is draining in a single day but the original used to last several days — what's wrong?

Check whether always-on display is active and whether continuous heart rate monitoring is enabled — both run on this 470mAh cell simultaneously and can cut multi-day life down to one day on their own. Open the Zepp app, set heart rate monitoring to smart mode rather than continuous, and switch the display to raise-to-wake only. If drain remains severe after those changes, a background app or abnormal GPS session may be keeping the processor awake — check active workout tracking and location permissions.

The watch won't reconnect to my phone after the battery swap even though Bluetooth is on both sides — how do I fix it?

Removing the battery ends the active BLE session, and the GTR 4 does not automatically re-establish a broken pairing — it needs a fresh handshake. On your phone, go to Bluetooth settings, forget the Amazfit GTR 4, then open the Zepp app and add the watch as a new device. The watch will broadcast its pairing signal once restarted, and the app will guide the reconnection from there.

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