LiFePO4 Battery Warranty Terms for Importers & Distributors: Years, Cycles, End-of-Life % and RMA
Two LiFePO4 batteries can both say “10-year warranty” and give a buyer very different protection. For importers, distributors and installers who will carry the first-line service burden, the warranty is part of the unit cost. This guide shows how to read a warranty, how to compare quotations, and which clauses to settle before the first order.
LJY Energy is a China-based LiFePO4 battery supplier and OEM/ODM solutions provider offering customization, project-confirmed specifications and export supply coordination. Warranty length, cycle and end-of-life terms, the RMA process and the issuing party are stated in the quotation and the order agreement. This page does not publish a fixed warranty period.
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Four ways a warranty is written
| Structure | How it is stated | What to check | Comment |
|---|---|---|---|
| Time only | Years from the ship or install date | Check which date starts the clock, and whether it is the same date for stock that sits in a distributor warehouse. | Years alone say nothing about wear. Ask what else limits the claim. |
| Time plus cycle cap | Years or cycles, whichever comes first | Check at which depth of discharge a cycle is counted and at what rate and temperature. | A cap quoted at one depth of discharge is not comparable with a cap quoted at another. |
| Throughput cap | Total energy delivered (kWh or MWh) | Check the figure against nominal energy × expected cycles. | Often the clearest limit for storage projects. Compare in kWh, not in cycles. |
| Capacity guarantee | Remaining capacity at end of life (EOL %) | Check the EOL percentage (for example 70% or 80%) and the test method for measuring it. | A higher EOL percentage is a tighter promise. The measuring method decides whether a claim can succeed. |
Worked arithmetic: reading the same warranty three ways
The numbers below are an example for a 51.2V 100Ah battery. They illustrate the arithmetic and are not an LJY warranty offer.
| Group | Reading | Result | Status |
|---|---|---|---|
| Energy | Nominal energy | 51.2V × 100Ah = 5,120Wh (5.12kWh) | [Industry reference] — arithmetic |
| Throughput | Example cap: 6,000 cycles at 80% depth of discharge | 6,000 × 5.12kWh × 0.8 = 24,576kWh of delivered energy | [Industry reference] — arithmetic |
| Time | Cycles per year at one cycle per day | 6,000 cycles ÷ 365 = about 16.4 years, so a 10-year term at one cycle per day reaches about 3,650 cycles | [Industry reference] — arithmetic |
| Capacity | Example end-of-life level of 70% | 0.70 × 5.12kWh = 3.58kWh usable at end of life | [Industry reference] — arithmetic |
The same battery can therefore be described as “6,000 cycles”, “about 24.6MWh” or “70% after the term”. Ask each supplier to restate its warranty in all three, then compare.
Conditions that decide whether a claim is accepted
- Depth of discharge, charge and discharge rate, and the operating temperature range used when cycles are counted
- Installation and settings: the inverter or charger profile must match the battery limits. For communication set-up see the closed-loop inverter communication guide
- Evidence a claim needs: serial number, date code, photos, inverter settings and BMS data if available
- Excluded events: physical damage, water ingress beyond the stated IP class, wrong charger, modification
- Storage rules for stock held by a distributor, such as storage state of charge and re-charge interval
RMA and after-sales clauses to agree before the first order
| Group | Parameter | Value | Status |
|---|---|---|---|
| Responsibility | Who issues the warranty and who receives the claim | The quotation names the issuing party. Production responsibility and certificate ownership are stated accurately where a buyer asks to verify them (see the OEM/ODM page). | [Confirmed per project] |
| Responsibility | First-line service by the distributor | Distributors often handle first-line checks locally. Agree which tests they run and what evidence they send. | [Confirmed per project] |
| Process | Claim evidence and response time | List the evidence required and the target response time in writing. | [Confirmed per project] |
| Process | Remedy: repair, replacement or credit | Settle the order of preference and whether replacement ships before the failed unit returns. | [Confirmed per project] |
| Process | Defective-on-arrival window | Agree the window and the incoming inspection method. See the incoming inspection guide | [Confirmed per project] |
| Logistics | Return freight and customs | Lithium batteries are dangerous goods. Return shipping needs compliant packing and documents, so agree who arranges and pays before it is needed. | [Confirmed per project] |
| Stock | Warranty reserve for a distributor | Some buyers agree a spare share with the order to cover local replacements. The share, if any, is project terms. | [Optional configuration] · [Confirmed per project] |
| Traceability | Serial number and date-code labelling, QR code if required | Label content is part of the OEM/ODM configuration. | [Optional configuration] |
| Data | BMS data export for claim analysis | Available only if the BMS and communication option support it. | [Optional configuration] · [Confirmed per project] |
| Term | Warranty length, cycle or throughput cap, EOL % | Stated in the quotation. Not published on this page. | [Confirmed per project] |
| Term | Extended warranty option | Offered only if agreed in the order. | [Optional configuration] · [Confirmed per project] |
Who handles a failed unit in my country?
If you resell or install batteries, your customer calls you first. Settle the claim chain before you pay for the first order. Every point below depends on the product, the supplier and the order, and none of it is a fixed LJY Energy term: the answers for your model are written into the quotation and the order agreement.
- Warranty scope. Ask what the warranty covers and what it excludes for this model, which party issues it, and what starts the clock.
- First line. Agree what you check locally before raising a claim (voltage at rest, BMS state, wiring, charger or inverter settings) and which records the supplier wants.
- Claim process. Ask how a claim is raised, who diagnoses the unit, how the reply is given, and which outcomes are possible (repair, replacement, credit). Ask for the process in writing.
- Responsibility. Ask who is responsible at each step: the party that issues the warranty, the producing manufacturer, you as the local seller, and the freight forwarder.
- Possible costs. Ask whether return freight, replacement freight, customs or local labour could arise, and who would bear each one. Do not assume any of these are covered; ask for the answer for your order before you pay.
- Local handling. Ask whether you may repair or replace a unit locally and be credited, or whether the unit must be sent back.
Evidence a claim usually needs: serial number and date code, photos of the unit and its label, the installation details and settings, a test log or voltage readings, and BMS data if the model can export it. Keep your own records and messages for every claim.
Dangerous-goods rules apply to returning lithium batteries; see the incoming inspection guide for checking goods on arrival and the MOQ, samples and trial runs guide for putting these questions to a supplier before a first order.
How to compare two supplier quotations
- Restate both warranties as years, cycles, delivered kWh and EOL percentage
- Check the conditions behind each number: depth of discharge, rate, temperature
- Check who answers a claim in your country and in which language and time zone
- Check the cost and route of a return, including customs for batteries
- Ask what the supplier requires from your side: installation rules, inspection and records
- Put the agreed clauses into the order agreement, not only into a brochure
To see how the written terms change the cost of a lower quote, read a worked example of how much failure a lower quote can absorb.
WhatsApp: +1 404 784 1946 (backup: +86 159 8945 0735)
Related guides and products
- Incoming inspection guide for importers
- How to verify cycle-life claims
- Cycle life vs depth of discharge
- MOQ, samples and trial runs
- Battery certification verification guide
- Wholesale and distributor program
- Distributor cooperation routes and the sample-to-repeat-order steps: distributors page; wholesale RFQ checklist and what a quote depends on: wholesalers page
- Closed-loop inverter communication guide
- Import guides where claim routes and documents differ by market: Pakistan, Saudi Arabia and UAE, Nigeria, Kenya, South Africa and Ghana
- Product catalog · Battery solutions
Frequently asked questions
What warranty period does LJY Energy offer?
The period and terms are set per product, order and market and are written into the quotation and order agreement. This page gives no fixed period.
Is a cycle count meaningful without depth of discharge?
No. The same battery delivers far more total energy in 6,000 cycles at 80% depth of discharge than in 6,000 cycles at 30%. Always ask for the depth of discharge, rate and temperature behind the cycle figure.
Who answers a warranty claim?
The quotation names the issuing party and the claim route. Distributors can agree to handle first-line checks locally.
Can a distributor hold spare units for local replacement?
This can be agreed as part of the order terms. Any spare share is project-confirmed and is not a standard offer on this page.
What happens if the inverter settings caused the fault?
Settings that do not match the battery limits can be an excluded cause. Confirm the profile and communication set-up before shipment; see the inverter communication guide.
General engineering guidance and worked arithmetic as of October 2026. Nothing on this page is an LJY test result, certificate, warranty term or inverter compatibility statement; those are confirmed per project in writing.