The United States hosts one of the world’s largest consumer electronics markets. All wireless products powered by lithium batteries, including Bluetooth earphones, smartwatches and portable power stations, must obtain FCC certification for legal sales within the US. For lithium battery manufacturers, FCC certification is an indispensable requirement for finished products equipped with their batteries to enter the American market.

1. What is FCC Certification?

Administered by the Federal Communications Commission (FCC) under the Federal Communications Act (FCA), FCC enforces mandatory radio frequency interference (RFI) control for most electronic devices. There are two primary certification routes for lithium battery-powered products:

• FCC ID (Third-party Certification): Mandatory for devices with intentional radiators exceeding specified power thresholds, such as products equipped with Wi-Fi, Bluetooth and Zigbee. Tests shall be conducted by FCC-recognized laboratories. A unique FCC ID number will be issued and marked on products upon approval.
• SDoC (Supplier’s Declaration of Conformity): Applicable to non-intentional radiators or low-power transmitters, e.g., internal charging circuits with basic radio frequency functions. Suppliers may issue the declaration independently without direct filing with the FCC.

For lithium battery related products, the core compliance requirements refer to FCC Part 15 for wireless device radio frequency emissions. FCC Part 68 applies to limited product categories and is less commonly used.

2. Key Test Items for Lithium Battery Products under FCC Rules

Lithium batteries operate on direct current and do not generate radio frequency interference themselves. FCC testing mainly targets the supporting charging circuits, BMS systems, built-in inverters and switching power supplies that may cause external radio disturbance.

• Conducted Emissions: Measure carrier voltage on power lines per FCC Part 15B. Ensure interference from built-in charging circuits stays within regulatory limits.
• Radiated Emissions: Test radio frequency interference ranging from 30MHz to 1GHz (extended above 1GHz for certain products) in semi-anechoic chambers or GTEM cells, complying with FCC Part 15B limits.
• Frequency Stability Test: For devices with wireless functions, verify frequency deviation meets FCC allocated spectrum requirements.
• SAR (Specific Absorption Rate) Test: Mandatory for wireless devices used close to the human body to guarantee user safety.
• Battery Safety Assessment: FCC does not directly audit battery safety. However, a valid UN 38.3 transportation test report is a prerequisite for global lithium battery shipment. Most purchasers require both FCC and UN 38.3 documents, so it is recommended to prepare both in advance.

3. FCC Certification Application Process

Step 1: Product Classification Determine whether to apply for FCC ID or SDoC. Products with Wi-Fi, Bluetooth or other wireless modules require FCC ID. Devices with only ordinary chargers and no wireless functions may adopt the SDoC procedure.

Step 2: Select Certification Body Cooperate with FCC-recognized Test Certification Bodies (TCB) or qualified FCC laboratories. Submit application documents including user manuals, block diagrams and circuit schematics.

Step 3: Sample Testing Deliver complete product samples for full tests covering radio frequency performance, conducted emissions, radiated emissions and SAR.

Step 4: Filing & Approval For FCC ID: TCB reviews test reports and completes official filing with the FCC. For SDoC: No official filing is required; retain all internal compliance documents for inspection.

Step 5: Obtain FCC ID Number After approval, a unique FCC ID is assigned. The ID shall be marked on the product, packaging or user manual, and is publicly searchable on the official FCC website (www.fcc.gov).

Step 6: Certificate Maintenance FCC ID has no fixed expiry date. Re-evaluation and re-filing are required if substantial modifications are made to product design, especially radio frequency related modules.

Certification Cycle

The FCC ID process generally takes 4–10 weeks, while SDoC can be completed in a shorter time. Manufacturers with existing CE EMC test data may reference relevant results to streamline RF testing and shorten the cycle.

4. General Notes for FCC Compliance

• FCC ID Marking: The FCC ID must be clearly printed on the product body. Marking only on outer packaging is not allowed unless special approval is obtained from the FCC.
• Non-interchangeable Test Data: FCC adopts ANSI C63.4 standards, which differ from CISPR 22 for CE. CE EMC reports can only be used for reference and cannot replace FCC test results. Separate testing and application are required.
• Authorized TCB Selection: FCC ID approval is exclusively processed by US-authorized TCBs instead of the FCC directly. Always verify the accredited scope before selecting a TCB partner.
• Latin American Market Expansion: FCC certification satisfies US requirements, while additional local approvals such as Anatel and IFETEL are needed for markets like Mexico and Brazil.
• FCC vs UL: FCC regulates radio frequency interference, while UL covers electrical safety. The two systems are independent. To fully meet North American market rules, apply for both FCC and UL certifications.

5. Frequently Asked Questions (FAQ)

Q1: Do standalone lithium batteries need FCC certification? A1: Pure lithium batteries are DC power sources without RF emission, so separate FCC certification is not required. If batteries are integrated into finished products with wireless functions (e.g., portable power stations with Wi-Fi), the complete product must pass FCC certification.

Q2: How to choose between FCC ID and SDoC? A2: The key criterion is whether the device contains an intentional radiator. Products with Wi-Fi, Bluetooth, Zigbee and other wireless modules must apply for FCC ID. Devices with only basic chargers or low-power RF functions may use the SDoC route.

Q3: What is the validity period of FCC certification? A3: FCC ID is permanently valid as long as no substantial product changes occur. Re-evaluation and re-filing are mandatory once core components such as RF modules and antennas are modified.

Q4: Can CE certification replace FCC certification? A4: No. CE is for the European Union and FCC is exclusive to the United States. They adopt different test methods and limit values and are not mutually recognizable. Enterprises targeting both markets need to apply for certifications separately.

Q5: Are Chinese manufacturers responsible for holding FCC certificates? A5: The responsible party under FCC rules is the US-based importer or local manufacturer. Chinese manufacturers can also hold FCC certificates, provided that a designated US contact person is appointed and all test records are retained for at least 5 years.

6. Professional FCC Certification Support

Guangdong Energy Storage Testing Technology Co., Ltd. keeps track of the latest FCC regulations. We provide one-stop services including product classification, pre-scan evaluation, TCB recommendation and full-process technical guidance for lithium battery-powered communication devices, helping clients reduce revision risks and accelerate US market access.

Disclaimer This article is for reference only and does not constitute certification commitment or legal advice. All operations shall comply with the latest official FCC regulations and standards.