BMW i3 Battery Replacement Parts List (OEM): The Hidden $1,200 in “Extras” Dealers Charge—And What You Actually Need for a Safe DIY Swap
“I ordered a ‘complete OEM battery pack’ for my 2016 i3 from a dealer.
The invoice said $11,800.
When it arrived, I realized:
- It didn’t include the service disconnect
- No HV cables or coolant lines
- Missing mounting brackets and gaskets
- And absolutely no BMS calibration tool
To finish the install, I had to buy 14 separate parts—totaling another $1,247.
Total cost: $13,047.
Then I saw CNS BATTERY’s listing:
‘Full 50kWh Pack – Plug & Play – Includes All Harnesses, Brackets, and Coolant Manifold.’
Price: $7,400.
Same CATL cells. Same fit. But everything included—down to the torque-spec bolts.
I could’ve saved over $5,600… if I’d known the real OEM parts list.”
If you’re planning a BMW i3 battery replacement—whether DIY or through a shop—you need to know:
The “battery pack” is just one piece of a 20-part system.
Skip even one component, and you risk HV faults, coolant leaks, or failed inspections.
In this transparent 2026 breakdown, we reveal:
- 📋 The complete OEM-equivalent parts list for i3 battery replacement (by model year)
- 💰 Which items are critical vs. optional—and where dealers markup prices 300%+
- ✅ How CNS BATTERY bundles every essential part into one plug-and-play kit
- 🛠️ A downloadable checklist to verify your supplier isn’t cutting corners
All data is cross-referenced with BMW ETK (Electronic Parts Catalog), ISTA+ installation guides, and real-world swap logs from 127 i3 owners.
🔧 Why “Just the Pack” Isn’t Enough
The i3’s high-voltage system is an integrated ecosystem. Replace only the cells, and you’ll face:
- Coolant leaks from mismatched fittings
- BMS communication errors from incorrect harnesses
- Mount failure from reused or missing brackets
- Failed safety inspections due to non-OEM service disconnects
BMW sells these components separately—which inflates cost and complicates sourcing.
📋 Complete BMW i3 Battery Replacement Parts List (OEM Equivalent)
✅ Core Components (Included in CNS Kits)
| Part | OEM BMW Number | Purpose | Dealer Price |
|---|---|---|---|
| Traction Battery Pack | 61 11 9 458 001 (42.2kWh) | Main energy storage | $9,200–$11,800 |
| Service Disconnect (Orange Handle) | 61 11 9 458 015 | HV isolation for safety | $220 |
| HV Cable Assembly (Pair) | 61 11 9 458 022 | Connects pack to power electronics | $380 |
| Coolant Inlet/Outlet Manifold | 64 51 9 458 033 | Circulates coolant through pack | $290 |
| Mounting Bracket Set (Front + Rear) | 51 12 9 458 044 | Secures pack to chassis | $185 |
| Sealing Gaskets & Washers | 07 11 9 458 055 | Prevents moisture ingress | $42 |
⚠️ Often-Missing “Small” Parts (But Critical!)
| Part | Why It Matters |
|---|---|
| Torque-to-Yield Mounting Bolts | Reuse causes stripped threads—must be new |
| HV Connector Locking Clips | Prevent accidental disconnection while driving |
| Battery Shield Fasteners | OEM uses special anti-rattle clips—generic screws vibrate loose |
| BMS Calibration Dongle (or Software Access) | Required to reset SOH and clear transport mode |
📌 Total “hidden” cost if sourced separately: $1,100–$1,400
💸 Real Cost Comparison: Dealer vs. CNS
| Item | BMW Dealer (Total) | CNS BATTERY (Complete Kit) |
|---|---|---|
| 50kWh Battery Pack | $10,500 | $7,400 |
| Service Disconnect | $220 | Included |
| HV Cables | $380 | Included |
| Coolant Manifold | $290 | Integrated design—no hoses |
| Mounting Hardware | $185 + $95 (bolts) | Reinforced brackets + bolts included |
| Gaskets & Seals | $42 | Pre-installed |
| TOTAL | $11,617+ | $7,400 |
✅ CNS kits use brand-new CATL NMC cells, IP67-rated connectors, and tool-less coolant coupling—exceeding OEM reliability in key areas.
🚫 The 3 Most Common “Parts Shortcuts” That Cause Failures
- Reusing Old Mounting Bolts
→ Leads to over-torquing, cracked brackets, and pack shift - Skipping the Service Disconnect
→ Violates NFPA 1970 EV safety standards—illegal in commercial repairs - Using Generic Coolant Hoses
→ Swell or crack under ethylene glycol exposure → HV short circuit risk
🔍 Pro tip: Always demand a parts manifest before paying. If they can’t list every component, walk away.
✅ Why CNS Ships a True “Plug-and-Play” System
We engineer our kits so you never hunt for missing pieces:
- Pre-assembled coolant loop—no external hoses to leak
- Color-coded HV connectors—match OEM pinout exactly
- Torque-spec bolts pre-packed in labeled bags
- Installation manual with torque sequences and BMS reset steps
- Lifetime technical support—including remote BMS activation
“I installed my CNS 45kWh pack in 3 hours. Every part was there—even the little foam grommets for the shield. Zero trips to the dealer.”
— Lena K., Portland
Frequently Asked Questions: i3 Battery Replacement Parts
Q: Do I need to replace the battery shield?
A: Only if cracked or rusted. CNS includes new fasteners—but you can reuse the OEM shield.
Q: Are CNS connectors compatible with OEM wiring?
A: Yes. We use identical TE Connectivity / Harting-style HV plugs—fully pin-compatible.
Q: Does the kit include coolant?
A: No—but our integrated manifold requires no filling. Just connect to existing lines.
Q: Can I buy individual parts from CNS?
A: Yes—for repair shops or partial replacements. Contact us with your VIN.
Q: Is BMS coding required?
A: No. Our packs ship in “transport mode” and auto-sync with i3 systems—no ISTA+ needed.
A Successful Swap Isn’t About the Biggest Battery—It’s About the Smallest Details
Because one missing washer can mean a leak… and one missing bolt can mean a recall.
Planning an i3 Battery Replacement—and Want to Avoid $1,200 in Surprise Add-Ons?
Tell Us:
- Your i3 model year (e.g., 60 Ah, 94 Ah, 120 Ah)
- Whether you need a full pack or module set
- Your country (for shipping/hardware compatibility)
We’ll Send You:
- A customized parts checklist for your exact vehicle
- A line-item quote showing what’s included (no hidden fees)
- Or a free consultation with our i3 installation specialist
Get everything you need—in one box. No guesswork. No markups.
Download Your Free i3 Battery Replacement Parts Checklist Now:
👉 https://cnsbattery.com/ev-battery-home/ev-battery-contact/
