BMW i3 Battery Warranty Claim Process: Step-by-Step (No Runaround, No Hidden Clauses)
“My Dealer Said My Battery Was ‘Out of Warranty’—But CNS Replaced It in 5 Days. Here’s Exactly How.”
You bought a new BMW i3 battery expecting peace of mind. Then, six months later, the range plummets. The BMS throws errors. You’re stranded on the highway.
You check your paperwork: “2-year/80,000km warranty.” You’re well within both limits.
But when you contact support, you’re told: “You didn’t install it at an authorized shop,” or “The error code isn’t covered,” or worst of all—“We need 4 weeks to review your claim.”
Sound familiar?
Many i3 owners face frustrating delays or denials with vague aftermarket warranties. But CNS BATTERY’s warranty process is different by design: transparent, fast, and built for real-world ownership—not fine print loopholes.
If you own (or are considering) a CNS BMW i3 battery, here’s exactly what to expect if you ever need to make a claim—step by step, with no surprises.
First: Know What’s Actually Covered
Before filing a claim, confirm your issue qualifies under CNS BATTERY’s standard 2-year or 80,000km warranty (whichever comes first):
✅ Covered:
- Capacity drop below 9 bars (from original 12) after full charge
- BMS communication failure
- Internal cell short or open circuit
- Manufacturing defects in modules, wiring, or connectors
- Coolant system leaks from factory-installed components
❌ Not Covered:
- Damage from improper installation (e.g., overtightened HV bolts)
- Physical impact (curb strikes, collisions)
- Water submersion or corrosion from external exposure
- Modifications or tampering with the pack enclosure
💡 Key advantage: Unlike many competitors, CNS does not require dealer-level installation. DIY or independent shop installs are fully valid—as long as our instructions are followed.
📋 Step-by-Step: How to File a CNS BATTERY Warranty Claim
Step 1: Document the Issue
- Take clear photos of error messages on your dashboard
- Record a short video showing state-of-charge vs. estimated range
- If possible, use OBDX Pro + BimmerLink to capture module voltages and BMS logs
Step 2: Contact CNS Support Immediately
Email support@cnsbattery.com or use the contact form with:
- Your order number
- Vehicle VIN
- Date of delivery/installation
- Description + media of the issue
⏱️ Response time: Most claims receive an initial reply within 24 business hours.
Step 3: Remote Diagnostics (If Needed)
Our engineers may ask you to:
- Perform a controlled charge/discharge test
- Share live data via remote video call
- Verify coolant levels or connector tightness
This step often resolves “false alarm” issues without replacement.
Step 4: Approval & Resolution
If the fault is confirmed as warrantable:
- Option A: We ship free replacement parts (e.g., faulty module, sensor harness)
- Option B: For major failures, we arrange a full pack exchange
- Shipping costs covered both ways (in most regions)
🌍 Real example: A customer in Berlin reported sudden power loss at 40% SOC. Within 3 days, CNS diagnosed a BMS relay fault, shipped a replacement control board, and guided installation via video—zero downtime.
Why CNS Claims Get Approved Faster Than Others
Three reasons:
- No middlemen: You deal directly with the manufacturer—not a reseller or distributor
- Lifelong technical support: Our team knows every batch, every firmware version
- Pre-shipment testing: Every pack is logged in our system, so we can trace performance history instantly
Compare that to generic brands that outsource support or vanish after 6 months—and you’ll see why CNS has a 98% first-time claim approval rate.
What If You Didn’t Buy From CNS? (A Reality Check)
If you’re using an OEM BMW battery:
- Factory warranty expired after 8 years or 100,000 miles (for most i3s)
- Replacement cost: $12,000–$16,000 with no recourse
If you bought a “refurbished” pack from an unknown seller:
- Warranty often limited to 90 days
- No technical backup when errors arise
- Cells may already be degraded at purchase
With CNS, you get manufacturer-backed assurance—not hope.
Frequently Asked Questions: Warranty Claims
Q: Do I need proof of professional installation?
A: No. As long as you followed our installation guide (provided with every order), DIY installs are fully covered.
Q: What if I’m outside the U.S. or EU?
A: We support warranty claims globally. Shipping logistics vary by region—but we coordinate local solutions whenever possible.
Q: Can I get a refund instead of replacement?
A: Only in rare cases (e.g., discontinued model). We prioritize fast functional restoration over refunds.
Q: Does opening the pack void the warranty?
A: Yes—unless done by CNS-authorized personnel. Never disassemble the enclosure yourself.
Q: How do you verify mileage if I don’t have service records?
A: We accept odometer photos, OBD-reported km, or even GPS-based trip logs as reasonable evidence.
Peace of Mind Isn’t Just a Promise—It’s Built Into the Process
A warranty is only as good as the company behind it. At CNS BATTERY, we’ve engineered not just reliable packs—but a customer-first claim experience that respects your time, your investment, and your trust.
Ready to Own a BMW i3 Battery Backed by Real Warranty Confidence?
Get a 50kWh or 62kWh replacement pack with clear terms, direct support, and a 2-year/80,000km guarantee—so you drive worry-free, knowing help is just one email away.
Click below to request your quote and experience warranty coverage that actually works:
👉 https://cnsbattery.com/ev-battery-home/ev-battery-contact/