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Fossil APP00222 Q Explorist Gen3 Compatible Battery 3.8V 370mAh

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Fits Fossil Q Explorist Gen3 and Armani ART5004 smartwatches, replacing OEM part APP00222.
3.8V, 370mAh lithium-polymer cell delivers the capacity these touchscreen watches need for daily fitness tracking and notifications.
Connector is a two-pin pogo dock; align the cell flat against the housing contact plate before seating.
We bench-tested this cell on a Gen3 unit; the fuel gauge IC initialized correctly and voltage held steady under HR sensor load.
After installing, place the watch on its magnetic charger immediately and charge to 100% — the fuel gauge cannot calibrate without a full charge cycle from near-zero after a cell swap.
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.

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🔹 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

3.8V

Amp

370mAh

Fossil Q Explorist Gen3 / Armani ART5004 — 3.8V Li-Polymer Replacement Battery (APP00222)

This 3.8V, 370mAh lithium-polymer cell replaces the APP00222 battery in the Fossil Q Explorist Gen3 and Armani ART5004 smartwatches. It fits the 31.00 × 26.00 × 4.00mm battery bay and connects to the same flex ribbon used by the original cell. Swap it when the watch no longer holds charge through a full day of normal use.

  • Q Explorist Gen3 and ART5004 platform: Both watches run the same Snapdragon Wear 2100 platform with identical voltage rails, connector pinout, and BMS handshake — one cell covers both.
  • Bench tested on actual hardware: We cycled this cell through charge and discharge on the Q Explorist Gen3 board. The fuel gauge IC registered correct capacity and the BMS held cutoff at the expected low-voltage threshold without triggering false low-battery flags.
  • Fuel gauge reset after fitting: After seating the new cell, place the watch on its magnetic charger immediately and charge to 100% before use. The fuel gauge IC on this platform cannot calibrate without a full charge cycle from near-zero after a cell swap — skipping this causes the percentage readout to behave erratically for days.

Why always-on display and continuous heart rate monitoring drain this cell hard

The Q Explorist Gen3 runs an AMOLED panel and an optical HR sensor that polls continuously when activity tracking is active. Together, those two subsystems draw significantly more current than notifications and step counting alone. This 370mAh cell matches the original capacity spec — the drain pattern you see reflects how the watch is configured, not a fault with the cell. Turn off always-on display or set HR monitoring to periodic rather than continuous to reduce the draw on this platform.

Watch not pairing to phone after battery replacement

Removing the battery cuts power to the BLE stack entirely, which discards the active session key stored in volatile memory. The phone still shows the watch as paired, but the watch boots with no record of the previous bond. Open the Fossil app or Wear OS companion app, forget the watch from Bluetooth settings on the phone, then re-initiate pairing from the watch's Bluetooth menu. The bond re-establishes within one pairing cycle — no factory reset needed.

Compatible Models

Q Explorist Gen3 Armani ART5004

Replaces Part Numbers

APP00222

Technical Specifications

Voltage3.8V
Amp Hours370mAh
Capacity370mAh
Rate1.41Wh
Net Weight8g /0.28 oz
Gross Weight33g /1.16 oz
Approximate Weight33g /1.16 oz
Dimension 31.00 x 26.00 x 4.00mm

Product Highlights

  • Brand: Fossil
  • 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 Q Explorist Gen3 shows 0% and won't turn on right after I put the new battery in — did I get a dead cell?

The fuel gauge IC lost its voltage reference when the old cell was removed, so it has no baseline to read from. Place the watch straight onto its magnetic charger without trying to power it on first. Let it charge uninterrupted to 100% — this single full cycle re-establishes the IC's reference points. After that, the percentage readout will track normally.

The new battery is draining to empty in a single day — the old one lasted longer even when it was degraded. What's happening?

Always-on display combined with continuous heart rate monitoring is almost always the cause on this platform. The optical HR sensor alone adds a measurable constant draw that compounds with the AMOLED panel. Go into watch settings and switch HR monitoring from continuous to every 10 minutes, and disable always-on display — those two changes bring the draw back into range for this 370mAh cell. If drain persists after the first full calibration charge cycle, check that no background app is holding a wake lock.

The magnetic charger is connected but the watch shows no charging indicator after the swap — is the contact alignment off?

Reassembly can shift the internal charge contact pad by a fraction of a millimetre, enough to break the magnetic charger circuit. Remove the charger, power the watch off, and re-seat the back cover with firm even pressure around the full perimeter. Reattach the charger and check the contact is centred on the charging pins — a correctly seated connection shows the charging animation within five seconds of contact.

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