The Apple Watch SE 40mm (2020) Replacement Battery (Model A2277) is an high-grade 245mAh Lithium-ion battery designed to replace aging, degraded, or swollen original batteries in your Apple Watch.
Over time, lithium-ion watch batteries naturally lose charge capacity, leading to short battery life, sudden power-offs during workouts, or sluggish watchOS performance. Installing this fresh, factory-tested replacement battery restores all-day power efficiency and reliable daily operation.
Key Features
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Optimal 245mAh Capacity: Matches original factory specifications (, ) for consistent, long-lasting daily power.
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Over-Charge & Safety Protection: Equipped with built-in protection IC circuitry to prevent over-charging, short-circuiting, over-heating, and power surges.
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Solves Battery Health Issues: Fixes degraded maximum capacity warnings, rapid power loss, or failure to charge on the magnetic puck.
Compatibility
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Apple Watch SE (1st Generation, 2020) – 40mm
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Model Numbers: A2351 / A2353 / A2355
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Battery Model Number: A2277 (Also cross-compatible with Apple Watch Series 5 40mm).
(Note: Not compatible with Apple Watch SE 44mm, Apple Watch SE 2nd Gen, or other Series models).
Technical Specifications
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Battery Model: A2277
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Chemistry: Lithium-ion (Li-ion) / Polymer
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Capacity: 245 mAh
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Voltage: 3.85 V
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Condition: Brand New
Note for Technicians: Replacing an Apple Watch battery requires softening the screen adhesive with controlled heat, using micro-spudgers to avoid damaging delicate flex cables, and applying a replacement display seal adhesive upon reassembly to help protect against dust and liquid ingress. Always fully discharge and cycle the new battery 2–3 times for optimal calibration.
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