A2058 A2059 Battery for Apple Watch Series 4 (40mm/44mm) Replacement
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Models: A2058 (for 40mm) / A2059 (for 44mm).
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Specifications: 224.9mAh (A2058) / 291.8mAh (A2059) at nominal 3.81V.
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Component: 0-cycle Tier-1 Li-ion polymer cells with original-grade flex cables.
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Compatibility: Drop-in fit for Apple Watch Series 4 models.
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B2B Procurement: Direct factory pricing, rigid QC testing, and flexible minimum orders for repair depots.
Product Description
The S4 SIP requires specific voltage parameters to function correctly. The A2058 and A2059 are the exact replacement batteries engineered for the 40mm and 44mm Apple Watch Series 4. We utilize Tier-1 lithium-ion polymer chemistry to match the original 224.9mAh and 291.8mAh capacities. Every unit is manufactured strictly to OEM dimensional tolerances, ensuring technicians can install them without chassis force. The built-in flex cable matches original routing paths to prevent micro-tears during assembly. These batteries are directly compatible with Series 4 model numbers A1977, A1978, A2007, and A2008.
Technical Parameters
| Technical Parameter | 40mm Specifications | 44mm Specifications |
|---|---|---|
| Part Number | A2058 | A2059 |
| Target Device | Apple Watch Series 4 (40mm) | Apple Watch Series 4 (44mm) |
| Rated Capacity | 224.9mAh (0.85Wh) | 291.8mAh (1.11Wh) |
| Nominal Voltage | 3.81V | 3.81V |
| Cell Type | Li-ion Polymer | Li-ion Polymer |
| BMS Chip | Dual IC Protection | Dual IC Protection |
| Cycle Life | 500+ Cycles (>80% retention) | 500+ Cycles (>80% retention) |
Need a stable supply plan? Send your model list + quantities + destination. We’ll confirm lead time, shipping method, and compliance documents before you place the order.
Features & Advantages
✅ 🔋 Precise Output Matching
The A2058 delivers 224.9mAh and the A2059 provides 291.8mAh at a stable 3.81V. This ensures the watch CPU receives consistent power, preventing random reboots or rapid voltage drops during high-load tasks like GPS tracking.
✅ ⚙️ Pre-Soldered Flex Connectors
Our batteries feature pre-attached flex cables with reinforced contact pins. This eliminates the need for any micro-soldering during the repair, reducing labor time and standardizing the repair process for your franchise locations.
✅ 🛡️ Integrated TI Protection IC
Battery management is critical in sealed wearables. We integrate Texas Instruments (TI) level protection chips on the BMS board to actively monitor for over-voltage, thermal spikes, and short circuits.
✅ 🏭 Factory-Direct Scalability
We bypass trading companies to supply repair chains directly. You can order small initial test batches to verify cell impedance and capacity on your own testing rigs before transitioning to large-volume, wholesale pallet orders.
Packing & Delivery
Lead Time & Shipping
In-stock items: Ship within 3 days
For standard replacement models with available inventory.Mass production orders: Ship within 7 days
For regular models under confirmed specifications and packaging requirements.Customized orders: Ship within 15 days
For custom cell configuration, size, wire/connector, PCB/BMS, labeling, or packaging.
Note: Final dispatch time depends on total quantity, model complexity, packaging requirements, and shipping compliance documents. We will confirm the estimated shipping date (ETD) after order confirmation.
Air freight (urgent, smaller volume)
Sea freight (cost-effective for bulk)
Rail / Truck (subject to destination)
Express channels
Documents available: UN38.3 / MSDS / Transport Test Report (if applicable)
Compliant packaging and carton labeling can be arranged based on the chosen shipping method.
EXW / FOB / CIF / DDP available
One-Stop Sourcing for the Complete Apple Ecosystem
-Streamline your supply chain. Consolidate your MacBook, iPad, iPhone, and Watch battery orders into a single shipment to reduce logistics costs and maximize your wholesale margins.
FAQ
Q1: Can I use the A2058 battery in a 44mm Apple Watch Series 4? No. The A2058 physically fits only the 40mm chassis. You must order the A2059 model for the 44mm version to ensure proper fitment and battery capacity.
Q2: How many charge cycles are these batteries rated for? Our Li-ion polymer cells are engineered to maintain at least 80% of their original capacity after 500 complete charge and discharge cycles at standard operating temperatures.
Q3: Are these batteries fully charged before shipping? No. To comply with UN38.3 international air freight regulations, all our batteries are discharged to approximately 30% state of charge (SOC) before leaving the factory.
Q4: Do I need micro-soldering skills to install these? No. Both the A2058 and A2059 come with the factory-style flex cable and connector pre-installed. It is a direct plug-and-play installation for hardware technicians.
Q5: Can we order a small sample batch before buying wholesale? Yes. We encourage repair networks to order initial sample batches. This allows your engineers to verify impedance, capacity, and dimensions before finalizing bulk procurement contracts.
Q6: What is the defect warranty for B2B orders? We offer a 12-month replacement warranty covering manufacturer defects, such as premature voltage drops or BMS failure, ensuring your inventory is protected.
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