Apple Watch Series 9 Battery A2954 / A3009 | 3.86V 41mm 282mAh & 45mm 308mAh — Double Tap Compatible
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✅ Fits Apple Watch Series 9 (41mm & 45mm) — P/N A2954 (41mm, 282mAh) and A3009 (45mm, 308mAh); 3.86V nominal; covers A2978, A2982, A2983 (41mm) / A2980, A2984, A2985 (45mm)
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✅ ±0.1mm dimensional tolerance — OLED-safe installation; Double Tap gesture and SpO2 sensor functionality fully preserved post-replacement
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✅ 3.86V PCM spec — distinct from S6/S7/S8; not interchangeable with earlier Watch generation batteries
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✅ Factory direct — both size variants in stock; custom labeling from 200 pcs; 12-month warranty; DOA < 0.3%
Descripción del Producto
The Apple Watch Series 9 (released September 2023) introduced the S9 chip and, with it, the Double Tap gesture — a feature that lets users control the Watch by tapping index finger and thumb together, without touching the screen. This gesture relies on the accelerometer, gyroscope, and optical heart rate sensor working in continuous low-power polling mode. It draws from the battery at all times, alongside Always-On Display and the background SpO2 sensor. Series 9 is the most power-feature-dense Watch Apple has shipped, and a sub-capacity replacement cell shows up in runtime shortfall faster than on any earlier generation.
Battery P/N is A2954 for the 41mm case (282mAh / 3.86V) and A3009 for the 45mm case (308mAh / 3.86V). The 3.86V nominal voltage is distinct from Series 6 (3.85V) and Series 5/SE (3.82V) — these are not interchangeable PCM specs. Our cells are PCM-matched to the S9’s 3.86V charge profile, with overcharge cutoff calibrated accordingly.
Modelos compatibles verificados:
| Dispositivo | Tamaño | Apple Model IDs | Número de pieza de la batería | Capacidad |
|---|---|---|---|---|
| Apple Watch Series 9 | 41mm | A2978 (GPS), A2982 (Cellular Global), A2983 (Cellular China) | A2954 | 282mAh |
| Apple Watch Series 9 | 45mm | A2980 (GPS), A2984 (Cellular Global), A2985 (Cellular China) | A3009 | 308mAh |
⚠️ Not compatible with Apple Watch Series 8 (uses A2961/A3002 at different specs) or Series 10. Despite similar case dimensions across S7–S9, battery P/Ns and PCM voltage profiles differ by generation. Always verify the Watch model number on the back housing.
Parámetros técnicos
| Parámetro | 41mm (A2954) | 45mm (A3009) |
|---|---|---|
| Número de pieza de la batería | A2954 | A3009 |
| Modelos compatibles | A2978, A2982, A2983 | A2980, A2984, A2985 |
| Voltaje nominal | 3.86V | 3.86V |
| Capacidad | 282mAh / 1.091Wh | 308mAh |
| Tipo de célula | Li-ion Polymer soft-pack (Grade A) | |
| Dimensional Tolerance | ±0.1mm (OLED re-seating and water resistance critical) | |
| PCM Spec | 3.86V profile — NOT interchangeable with S6 (3.85V) or S5/SE (3.82V) | |
| Charge Voltage (Max) | 4.35V ± 0.05V | |
| Discharge Cut-off | 2,75 V | |
| Feature Compatibility | Double Tap, AOD, SpO2, ECG, heart rate — full function preserved | |
| Ciclo de vida | ≥ 600 cycles @ 80% DOD | |
| Temperatura de funcionamiento | 0°C ~ 45°C (charge) / -20°C ~ 60°C (discharge) | |
| Tipo de conector | OEM-compatible flex connector | |
| Protection (PCM) | Overcharge / over-discharge / short circuit | |
| Water Resistance (Device) | IP6X dust / 50m water resistance — maintained with correct cell spec | |
| Certificaciones | CE, FCC, RoHS, UN38.3; MSDS/SDS on request | |
| Fabricante de equipos originales (OEM)/fabricante de diseños originales (ODM) | Custom label / packaging from 200 pcs per variant | |
| Condición | Brand new, 0 cycle, 100% capacity-tested | |
| Garantía | 12 months from shipment date | |
| Lead Time (Stock) | 3–5 business days | |
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Características y ventajas
✅ 👆 Double Tap Gesture — Requires Stable Continuous Power Delivery
Double Tap is unique to S9 and Ultra 2. It works by having the S9 chip continuously monitor the accelerometer and optical sensor at low power for the specific micro-movement signature of the gesture. A cell with high internal resistance or sub-rated capacity causes voltage sag under this polling load, which produces inconsistent gesture recognition — a complaint that shows up as a “Double Tap not working” issue that is actually a battery problem. Grade-A cells with low internal resistance maintain stable delivery under continuous sensor polling.
✅ ⚡ 3.86V PCM — Generation-Specific, Not a Drop-in Substitute
The Series 9 runs at 3.86V nominal — 10mV higher than S6, 40mV higher than S5/SE. The difference is small but the PCM overcharge cutoff is calibrated to it. Installing an S6 or S8 battery in an S9 (or vice versa) results in incorrect charge termination behavior. Our cells carry the PCM spec matched to A2954/A3009, not a generic Watch PCM shared across generations.
✅ 📐 ±0.1mm Tolerance — OLED Enclosure Has No Flex Margin
Series 9 uses the same case geometry as S7/S8 — larger display, tighter internal layout than S5/S6. An out-of-tolerance cell (even 0.2mm over spec) prevents the OLED from re-seating and risks compromising the IP6X water resistance seal. Our dimensional tolerance is held at ±0.1mm across every production batch, verified on finished cells before shipment.
✅ 🏭 Both Variants in Stock — Custom OEM Options Available
A2954 (41mm) and A3009 (45mm) are stocked and shippable in a single order. For repair distributors building branded Watch S9 repair kits: custom labeling and retail packaging available from 200 pcs per variant. Series 9 is now entering peak replacement demand — units sold at launch in September 2023 have been through 900+ charge cycles in daily-use scenarios.
Embalaje y entrega
Plazo de entrega y envío
Artículos en stock: Envío en 3 días
Para modelos de reemplazo estándar con inventario disponible.Pedidos de producción en masa: Envío en 7 días.
Para modelos regulares bajo especificaciones confirmadas y requisitos de empaque.Pedidos personalizados: Envío en 15 días.
Para configuración de celda personalizada, tamaño, cable/conector, PCB/BMS, etiquetado o embalaje.
Nota: El tiempo de envío final depende de Cantidad total, complejidad del modelo, requisitos de embalaje y documentos de cumplimiento de envío. Le confirmaremos la fecha estimada de envío (ETD) después de la confirmación del pedido.
Transporte aéreo (urgente, menor volumen)
Transporte marítimo (rentable para graneles)
Ferrocarril / Camión (sujeto a destino)
Canales exprés
Documentos disponibles: UN38.3 / MSDS / Informe de prueba de transporte (si corresponde)
Se pueden organizar embalajes y etiquetado de cajas compatibles según el método de envío elegido.
EXW / FOB / CIF / DDP disponibles
Abastecimiento integral para todo el ecosistema de Apple
Optimice su cadena de suministro. Consolide sus pedidos de baterías para MacBook, iPad, iPhone y Watch en un solo envío para reducir costos logísticos y maximizar sus márgenes de venta al por mayor.
Preguntas frecuentes
Q1: Which Apple Watch Series 9 models do A2954 and A3009 fit?
A: A2954 (282mAh, 41mm) fits A2978 (GPS), A2982 (Cellular Global), and A2983 (Cellular China). A3009 (308mAh, 45mm) fits A2980 (GPS), A2984 (Cellular Global), and A2985 (Cellular China). Not compatible with Series 8 or Series 10 — different P/Ns and PCM specs. Verify the model number engraved on the Watch back housing before ordering.
Q2: Will Double Tap gesture work normally after replacing the Series 9 battery?
A: Yes — when the replacement cell meets spec. Double Tap relies on the S9 chip continuously polling the accelerometer and optical heart rate sensor at low power to detect the specific movement signature. A cell with elevated internal resistance causes voltage sag under this polling load, which produces inconsistent or failed gesture recognition. This gets reported as a software issue but is actually a battery quality issue. Grade-A cells with low internal resistance maintain stable delivery under continuous sensor load. No watchOS recalibration is required after a correct battery replacement.
Q3: Can I use a Series 8 battery in a Series 9, or vice versa?
A: No. Despite sharing the same 41mm/45mm case dimensions introduced in Series 7, battery P/Ns and PCM voltage profiles differ across generations. Series 8 uses A2961 (41mm) and A3002 (45mm). Series 9 uses A2954 and A3009. The voltage profiles and connector seating are generation-specific. Substituting across generations risks incorrect charge termination or physical fitment failure at the connector.
Q4: How long does the Series 9 battery last after replacement, with AOD and Double Tap active?
A: Apple’s published battery life for Series 9 with AOD enabled is 18 hours under typical use. With AOD disabled, Apple states up to 36 hours in Low Power Mode. A correctly installed A2954/A3009 replacement cell restores runtime to those figures. Double Tap’s continuous sensor polling adds a constant low baseline drain — this is factored into Apple’s published 18-hour spec, not an additional load on top of it.
Q5: Series 9 was discontinued in some markets due to the blood oxygen patent dispute. Does this affect the battery or repair demand?
A: The patent dispute affected the blood oxygen sensor’s availability in the US market on new sales, but it has no effect on repair demand for existing units already in use. Worldwide, Series 9 was Apple’s highest-volume Watch at launch. The global install base is large, and units are now entering their peak battery replacement window regardless of the US retail situation. SpO2 sensor function is unaffected by battery replacement.
Q6: What should a repair technician check before starting a Series 9 battery replacement?
A: Three things before opening: (1) Confirm the model number on the Watch back (A2978/A2982/A2983 for 41mm, A2980/A2984/A2985 for 45mm) and match to the correct battery variant. (2) Note the Watch’s water resistance rating — Series 9 is rated IP6X dust / 50m water resistance. Opening the Watch voids the seal; post-replacement, the seal requires professional re-application of adhesive gasket material to restore the rating. (3) Use a calibrated heat pad at 70–80°C for 60–90 seconds to soften the display adhesive before separation — higher temperatures risk OLED damage on the larger S7-generation display size used in S9.
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