BMW i3 Battery Warranty Claim: Required Documents – Skip the Runaround and Get Your Replacement Approved in 48 Hours
“I submitted a warranty claim for my failing i3 battery. The supplier asked for ‘proof of degradation’—but wouldn’t say what format they accepted. I sent photos, then a video, then a dealer report. They rejected all three. Frustrated, I called CNS. Their engineer said, ‘Just send a BimmerLink screenshot showing usable kWh and your VIN.’ Two days later, my replacement module shipped. No games. Just clarity.”
You’ve invested in a quality i3 battery.
It’s under warranty.
Now it’s failing—and you’re ready to file a claim.
But you hit a wall:
“What exactly do they need? And why does every supplier ask for something different?”
The difference between a 3-day resolution and a 3-month headache often comes down to one thing:
Submitting the right documents—in the right format—from the start.
In this guide, you’ll get:
- The exact list of required documents for a CNS BATTERY warranty claim
- Why dashboard bar counts aren’t enough (and what to use instead)
- How to capture valid proof of degradation with free tools
- What voids your warranty (even if the battery is faulty)
- And a step-by-step submission checklist that guarantees review
Because your time matters—and so does your peace of mind.
Why Most i3 Warranty Claims Get Delayed (or Denied)
Dealers and third-party suppliers often reject claims due to insufficient or incorrect evidence, not because the battery is fine. Common mistakes:
❌ Using only dashboard bar count (too subjective)
❌ Sending blurry photos of error codes (no context)
❌ Omitting proof of proper installation
❌ Failing to show State of Health (SoH) quantitatively
At CNS BATTERY, we streamline the process with transparent, objective criteria—so you know exactly what’s needed upfront.
✅ Required Documents for a CNS i3 Battery Warranty Claim
To qualify under our 2-year / 80,000 km warranty, submit these three items:
1. Proof of Purchase
- Original invoice or order confirmation from CNS
- Must include product model, date, and your name
2. Valid Degradation Evidence
- Screenshot from BimmerLink, ISTA, or Carly showing:
- Usable Capacity (kWh)
- Vehicle Identification Number (VIN)
- Timestamp (within last 7 days)
- Example: A 50kWh pack showing <37.5 kWh usable = <75% SoH = valid claim
3. Installation Verification
- Photo of the installed battery label (showing CNS serial number)
- OR a signed note from your installer confirming correct procedure was followed
📌 Note: We do not require dealer diagnostics or paid third-party reports.
What Voids Your CNS Warranty (And How to Avoid It)
Even with valid degradation, claims are denied if:
🚫 Battery was opened or modified without CNS authorization
🚫 Installed by unqualified personnel (e.g., no HV certification)
🚫 Used with non-compatible chargers or inverters
🚫 Physical damage from impact, water ingress, or improper handling
💡 Pro tip: Always follow our installation manual and use the included harnesses. If in doubt, contact our engineers before installing.
How to Capture Valid Degradation Proof (Free & Easy)
You don’t need a dealer. Just:
- Download BimmerLink (iOS/Android, ~$15 one-time)
- Connect an OBDLink MX+ adapter (supports PT-CAN)
- Go to: High Voltage → Battery Status
- Take a screenshot showing:
- Usable Capacity (kWh)
- VIN (auto-displayed)
- Date/time
📸 Example of a valid claim screenshot:
![BimmerLink showing 36.2 kWh usable on a 50kWh pack, VIN visible]
This single image proves SoH objectively—no interpretation needed.
The CNS Warranty Advantage: Clarity Over Complexity
Unlike vague “defect-only” warranties, CNS guarantees:
✅ Minimum 75% State of Health within 2 years or 80,000 km
✅ No hidden clauses about “normal wear”
✅ Direct engineer support during claim review
✅ Replacement parts shipped within 48 hours of approval
“When my pack hit 36.8 kWh at 19 months, I emailed the BimmerLink screenshot. Got a reply in 3 hours: ‘Approved. Module shipping tomorrow.’ No forms. No calls.”
— David L., London
We built the process for humans—not bureaucracy.
Frequently Asked Questions: i3 Battery Warranty Claims
Q: Do I need to return the faulty battery?
A: Only if requested—but most module-level claims don’t require it. Full pack returns are coordinated with prepaid shipping.
Q: Can I file a claim if I installed it myself?
A: Yes—as long as you followed our instructions and didn’t open the pack.
Q: What if my car shows “Reduced Power” but kWh looks okay?
A: That may indicate a BMS or sensor issue, not cell degradation. Contact us first—we’ll help diagnose before you submit.
Q: Is the warranty transferable if I sell my i3?
A: No—it’s valid only for the original purchaser.
Q: How long does review take?
A: Within 24–48 business hours if all documents are complete.
Don’t Let Paperwork Stand Between You and Peace of Mind
A strong warranty is only as good as its claims process.
Ours is designed to protect you—not test your patience.
File with Confidence—Backed by a Warranty That Works
If your CNS i3 battery isn’t performing as promised, we make it right—fast, fairly, and without red tape.
Need help preparing your claim? Our engineers are ready to assist:
👉 https://cnsbattery.com/ev-battery-home/ev-battery-contact/