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Amazfit A1918 Replacement Battery 3.8V 380mAh

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From $33.99 USD $41.99
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Fits Amazfit A1918, A1808, A1818, A1807 smartwatch; replaces OEM part PL502524G, PL512524G, PL502524V.
3.8V, 380mAh lithium-polymer cell delivers 1.44Wh to sustain fitness tracking, heart rate monitoring, and notifications across multi-day operation cycles.
Connector mates to magnetic charging pads on watch back; no locking tab—cell seats flat against contact pins during reassembly.
Bench testing showed BMS initializing fuel gauge at full capacity; discharge curve stable under mixed GPS and HR sensor loads.
Place watch on charger immediately after cell swap and charge to 100% before wearing—the fuel gauge IC cannot calibrate without a complete charge cycle from near-zero after replacement.
Delivery time

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.

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

380mAh

Amazfit A1918 / A1808 / A1818 Series — 3.8V Li-Polymer Replacement Battery (PL502524G)

This 3.8V, 380mAh Li-Polymer cell replaces the original battery in the Amazfit A1918, A1808, A1818, A1807 Nexus, and six additional Amazfit smartwatch variants. The cell measures 24.00 × 24.20 × 5.10mm and matches OEM part numbers PL502524G, PL512524G, and PL502524V. It restores full operation across fitness tracking, heart rate monitoring, and notifications without replacing the watch.

  • A1918 / A1808 / A1818 platform compatibility: These models share the same 3.8V cell format, connector pitch, and BMS handshake protocol. Swapping between them uses the same physical cell and the same fuel gauge IC — that is why one part number covers the entire line.
  • Bench tested on actual hardware: We cycled this cell through charge and discharge on the A1918 platform. The BMS accepted the new cell without error flags, and the fuel gauge updated state-of-charge correctly after a full charge cycle from near-zero.
  • Post-swap charger step for Amazfit fuel gauge IC: Place the watch on its magnetic charger immediately after fitting this cell and charge to 100% before first use. The fuel gauge IC on this platform loses its reference point when the cell is removed and cannot recalibrate without one complete charge cycle from near-zero.

Why the A1918 reports inaccurate battery percentage after a cell swap

The Amazfit A1918 uses a coulomb-counting fuel gauge IC that tracks charge by measuring current in and out of the cell over time. When you remove the old battery, the IC loses its accumulated reference data entirely. A new cell with a full charge will confuse it — the IC sees no history and defaults to a percentage it cannot verify. The fix is straightforward: fit the new cell, charge to 100%, then allow one normal discharge cycle. After that single cycle, the percentage readout stabilises.

Charge contacts not making on magnetic charger after reassembly

If the watch does not begin charging after a battery swap, the magnetic charger contacts have likely shifted during reassembly. The back cover alignment on the A1918 series is tight — even a fraction of a millimetre off-centre breaks the contact circuit. Remove the back cover, re-seat the battery connector, and refit the cover with even pressure around the full perimeter. Confirm charging has started by checking for the charging indicator within 30 seconds of placing it on the charger.

Compatible Models

A1918 A1808 A1818 A1807 Nexus GTR47 T-rex Verge Lite A1811 A1801 Verge Lite V010

Replaces Part Numbers

PL502524G PL512524G PL502524V

Technical Specifications

Voltage3.8V
Amp Hours380mAh
Capacity380mAh
Rate1.44Wh
Net Weight7g /0.25 oz
Gross Weight32g /1.13 oz
Approximate Weight32g /1.13 oz
Dimension 24.00 x 24.20 x 5.10mm

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 Amazfit shows 0% and won't turn on right after I put in the new battery — did I get a dead cell?

The cell is almost certainly fine. The fuel gauge IC on the A1918 platform loses its charge reference the moment the old battery is disconnected, so it reads 0% or refuses to boot when it sees an uncalibrated cell. Place the watch on its magnetic charger immediately and leave it until it reaches 100% — do not try to power it on mid-charge. After one full charge cycle from near-zero, the IC recalibrates and the watch boots normally.

Battery is draining in one day on my Amazfit after the swap — it used to last several days.

Continuous heart rate monitoring and an active notification feed together draw significantly more current than periodic HR sampling alone. Check your settings — if always-on heart rate is enabled alongside raise-to-wake and frequent app syncing, that combination can pull the 380mAh cell down inside 24 hours. Switch heart rate monitoring to auto or interval mode and disable always-on display, then observe drain over two full charge cycles before assuming a cell fault.

Watch won't pair with my phone after replacing the Amazfit battery — Bluetooth just keeps searching.

Removing the battery kills the active BLE session and the watch loses its bonded device record. Your phone still holds the old pairing entry, but the watch no longer recognises it. Open your phone's Bluetooth settings, forget the Amazfit device entirely, then open the Zepp app and run a fresh pair from the device setup screen. The watch will appear as a new device and pair cleanly.

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