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Apple Watch Series 7 A2663 Replacement Battery 3.85V 280mAh

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From $46.99 USD $57.99
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Fits Apple Watch Series 7 model A2473 and replaces OEM battery part A2663.
Voltage runs 3.85V at 280mAh capacity, delivering 1.08Wh to sustain the display, processor, and continuous health sensor polling.
Connector is the flat contact pad on the watch's main board; alignment matters for magnetic charger engagement after reassembly.
We tested the cell on a Series 7 mainboard; the BMS calibrated correctly after a full charge cycle from near-zero.
After fitting, place the watch on the magnetic charger immediately — the fuel gauge IC requires a complete zero-to-full cycle to register accurate capacity.
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.

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

3.85V

Amp

280mAh

Apple Watch Series 7 41mm — 3.85V Li-Polymer Replacement Battery (A2663)

This is a 3.85V, 280mAh Li-Polymer cell built to replace the original A2663 battery in Apple Watch Series 7 41mm models — covering A2473, A2475, and A2476. It restores power to the display, processor, heart rate sensor, and GPS radio. Dimensions are 26.10 x 20.10 x 4.60mm, matching the original cell footprint.

  • Series 7 41mm platform fit: The A2473, A2475, and A2476 share the same internal chassis and battery bay. All three accept the A2663 cell on the same connector and flex layout — no adapter or modification needed.
  • Bench tested on actual hardware: We ran this cell through charge and discharge cycles on a Series 7 41mm unit. The BMS handshake completed without fault codes, and the fuel gauge IC accepted the new cell reference after a full charge cycle.
  • Post-swap charger protocol: After fitting this cell, place the watch on its magnetic charger immediately and charge to 100% before first use. The fuel gauge IC on Series 7 loses its capacity reference when the cell is removed — it cannot recalibrate without a full charge from near-zero after the swap.

Why the Series 7 fuel gauge reads wrong after a cell swap

The Apple Watch Series 7 uses a dedicated fuel gauge IC that tracks capacity by monitoring charge and discharge curves over time. When you remove the original cell, the IC loses its stored reference data entirely. The new cell starts with no learned curve, so the gauge has no baseline to calculate remaining charge. Until you complete one full charge cycle from near-zero to 100%, the percentage readout will be unreliable — expect wildly jumping numbers or a stuck reading for the first cycle.

Watch not pairing to iPhone after battery replacement

Removing the battery cuts power completely, which terminates the active Bluetooth Low Energy session between the watch and iPhone. The watch does not automatically re-establish that session on reboot — the phone sees it as an unknown device. Open the Watch app on your iPhone, go to General > Reset > Erase Apple Watch Content and Settings, then re-pair from scratch. You do not lose health data stored in the Health app — that syncs to iCloud before the reset.

Compatible Models

A2473 A2475 A2476 Watch Series S7 41mm

Replaces Part Numbers

A2663

Technical Specifications

Voltage3.85V
Amp Hours280mAh
Capacity280mAh
Rate1.08Wh
Net Weight6g /0.21 oz
Gross Weight31g /1.09 oz
Approximate Weight31g /1.09 oz
Dimension 26.10 x 20.10 x 4.60mm

Product Highlights

  • Brand: Apple
  • Manufacturer: CS
  • Color: Black
  • Product Type: Li-Polymer
  • Battery Type: Li-Polymer
  • Warranty: 12 Months
  • Bulk Orders: sales@batteryweb.com

Frequently Asked Questions

My Apple Watch Series 7 shows 0% and won't turn on right after I put the new battery in — did I get a dead cell?

Almost certainly not a dead cell. The fuel gauge IC loses its charge reference the moment the original battery is disconnected, and it has no baseline to read the new cell. Place the watch on its magnetic charger immediately — do not try to power it on first. Let it charge uninterrupted to 100%, and the gauge will recalibrate on that first full cycle.

The new battery is draining in a single day — my old worn-out battery lasted longer. What's happening?

Always-on display combined with continuous heart rate monitoring pulls significant current, and a new cell exposes the full draw that a degraded battery was masking with early shutdowns. Check that Theatre Mode and the always-on display setting are in the state you expect — Settings > Display & Brightness. Also confirm sleep tracking isn't running 24 hours; that keeps the accelerometer and HR sensor active continuously. After two or three full charge cycles the fuel gauge reading stabilises and day-to-day drain becomes predictable.

The heart rate sensor and GPS seem to be chewing through the new battery much faster than they did on the old one. Is something wrong with the cell?

Nothing is wrong with the cell. A new Li-Polymer cell presents a different internal impedance than a degraded original, and the sensor power management circuit draws more current against that fresh impedance profile during the first several charge cycles. The GPS radio behaves the same way — slightly elevated draw for the first week as the BMS learns the new cell's curve. Track drain after five full charge cycles; if it hasn't settled by then, check that Location Services isn't set to Always On for a background app pulling continuous GPS fixes.

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