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Warranty & RMA Procedure

Official 5-to-10 Year Limited Performance Warranty Coverage, Rapid Replacement Protocols, and International Technical Support.

Warranty Policy Ver: 2026.1 Tier-1 Grade-A Cell Guarantee

Dongguan Wangli Power Technology Co., Ltd. (“WLUG Energy”) designs and manufactures its lithium battery systems to the highest industrial quality and safety standards. Every system undergoes 100% End-of-Line (EOL) testing, BMS telemetry calibration, and rigorous cell capacity grading before dispatch.

Standard Warranty Scope: WLUG Energy guarantees that all supplied LiFePO4 battery packs will remain free from material defects and craftsmanship failures, maintaining at least 70% of initial rated capacity throughout the designated warranty duration under normal operating conditions.

1. Warranty Terms by Product Category

Product Category Standard Warranty Cycle Life Rating Core Cell Grade
Residential ESS 5 Years Warranty / 8,000 Cycles ≥8,000 cycles @ 90% DoD (0.5C, 1C) Grade-A Prismatic LiFePO4
Commercial Inverters & All-in-One 2 Years (Extendable to 5 Years) Continuous industrial duty Pure Sine Wave / High-Voltage MPPT
Power & Telecom Battery Modules 5 Years / 8,000 Cycles @ 90% DoD ≥8,000 cycles @ 90% DoD Grade-A LiFePO4 Prismatic
Replacement BMS & Control Boards 3 Years Industrial RS485/CAN interface Hardware-grade protection circuits

2. Warranty Claim & RMA Procedure (Step-by-Step)

To ensure zero operational disruption to overseas projects and minimize logistics costs, WLUG Energy employs a Remote Diagnostics & Direct Air Replacement protocol:

  1. Step 1: Notice of Issue & BMS Log Submission: Client emails the designated support desk with the product serial number (SN), photos/videos of the error code, and the BMS telemetry log file.
  2. Step 2: Engineering Assessment within 24 Hours: Our engineering specialists verify cell voltages, temperatures, and BMS fault registers via remote telemetry analysis.
  3. Step 3: Rapid Modular Dispatch: If a sub-component (such as an individual BMS board, cell interconnect, display unit, or modular pack) is identified as defective, WLUG Energy dispatches genuine replacement parts.
  4. Step 4: System Replacement: In the rare event of non-field-repairable internal structural failure, a replacement battery module is immediately allocated from the next production batch or nearest regional distributor buffer.

3. Warranty Exclusions

The warranty does not apply to damages resulting from the following external circumstances:

  • Improper installation, wiring, or reverse-polarity connection contrary to the official WLUG Engineering User Manual.
  • Operating the battery beyond specified temperature boundaries (-20°C to +55°C) or prolonged exposure to water submersion without adequate enclosure rating.
  • Unauthorized modification, firmware rewriting, or disassembly of sealed battery enclosures without written authorization from WLUG technical support.
  • Physical impacts, drop shocks during client-managed inland transportation, lightning strikes, or fire disasters not originating from the battery system itself.

4. Technical Support & RMA Contact

For urgent on-site technical guidance, RMA warranty verification, or firmware updates, reach out to our dedicated engineering desk:

WLUG Energy After-Sales Engineering Center
Email: wldlbattery@gmail.com
Website: www.wldlpower.com
Technical Hotline: +86 137 1333 1419
WhatsApp Support: +86 13726441419
Hours: Monday to Saturday, 08:30 – 18:30 (UTC+8) (Emergency on-call 24/7)