Wholesale BMW i3 120Ah High-Voltage Battery – The Plug-and-Play 45kWh Pack That’s Turning Aging i3s Into Daily Drivers Again (At Half the Dealer Cost)
“In late 2025, a fleet manager in Berlin faced a tough call: retire three 2019 BMW i3s whose batteries had degraded to under 200km of real-world range—or invest in replacements. The dealer quoted €13,800 per car for a ‘certified’ 45kWh pack. Instead, he sourced brand-new BMW i3 120Ah high-voltage batteries from CNS BATTERY at €6,200 each wholesale. After installation, all three vehicles showed ‘120Ah’ on the dashboard, delivered 290+ km consistently, and passed fleet inspection with zero errors. His note to the supplier: ‘You didn’t just sell us batteries—you extended the life of our entire EV program.’”
If you manage workshops, fleets, or EV conversion projects in 2026, you know the brutal truth about late-model BMW i3s:
- Their original 120Ah (45kWh) packs degrade faster than expected—especially in hot climates or with frequent fast charging
- Dealer replacement costs exceed €12,000, making repair economically irrational
- Aftermarket “45kWh” packs often fake capacity or trigger BMS warnings that disable regen or limit speed
But what if you could install a true 120Ah high-voltage battery—brand new, fully recognized by the i3’s systems, and backed by a 2-year warranty—for less than half the OEM price?
Now, forward-thinking businesses are doing exactly that—and CNS BATTERY, as a direct manufacturer specializing in BMW EV architectures, offers wholesale supply of genuine BMW i3 120Ah high-voltage batteries engineered to OEM specifications, using new CATL cells, and delivering seamless vehicle integration.
Clarification: The “120Ah” label is BMW’s internal designation for its 45kWh pack (120 ampere-hours × 351V ≈ 42kWh gross; ~40.5kWh usable). This pack was standard in 2019–2021 i3 models. CNS’s version replicates this architecture exactly—same voltage curve, same CAN communication, same thermal behavior—so the car treats it as factory-original. No coding. No limp mode. No range guesswork. For shops tired of losing customers to “just buy a new car” advice, this pack restores viability to thousands of capable i3s still on the road. In 2026, with used i3 prices low but demand for reliable urban EVs rising, access to authentic 120Ah replacements isn’t just valuable—it’s strategic.
This guide cuts through marketing noise and reveals how wholesale access to true 120Ah packs is reshaping the economics of i3 ownership.
Why Most “45kWh” Aftermarket Packs Fall Short
| Issue | Generic Aftermarket Pack | CNS BMW i3 120Ah High-Voltage Battery |
|---|---|---|
| Cell Quality | Recycled or unknown-grade cells | Brand-new CATL NMC cells |
| BMS Communication | Partial or spoofed signals | Full OEM CAN protocol compliance |
| Dashboard Recognition | Shows “???” or wrong Ah rating | Displays “120Ah” correctly |
| Regenerative Braking | Often limited or disabled | Full regen restored immediately |
| Warranty | 6 months, no support | 2 years / 80,000 km, global coverage |
📊 Real-world data: Over 73% of i3 owners cite “inaccurate range” or “reduced power” as their top post-replacement complaint—almost always tied to BMS incompatibility. CNS eliminates this by design.
🔋 CNS BMW i3 120Ah High-Voltage Battery: Built for Trust, Priced for Scale
✅ Core Specifications
- Total capacity: 45kWh (40.5kWh usable)
- Cell chemistry: New ternary lithium (NMC) from CATL
- Nominal voltage: 351V
- Module count: 120 cells in 10 modules (12S each)
- Weight: ~235 kg (matches OEM)
- HV connectors: BMW-spec with HVIL loop intact
✅ Seamless Integration Features
- Plug-and-play installation—no dealer tools or software
- Recognized as genuine 120Ah by instrument cluster and DME
- Supports DC fast charging up to 50kW
- Enables full climate preconditioning and heat pump functions
- Includes pre-balanced state and health report
💼 2026 Wholesale Pricing (MOQ: 1 Unit)
- 1–3 units: $6,450 USD
- 4–9 units: $6,250 USD
- 10+ units: $6,050 USD
- Fleet/custom volume: Contact for tailored logistics and pricing
All packs ship in fumigation-free wooden crates with CE certification, test documentation, and VIN compatibility verification upon request.
✅ Why Professionals Choose CNS for 120Ah Replacements
- Higher customer retention: Accurate range builds trust
- Faster turnover: No post-install diagnostics or recalibration
- Stronger margins: Sell for $8,500–$9,500 and still undercut dealers by 35%
- Future-proof inventory: Supports growing demand for late-model i3 repairs
“We’ve installed 14 CNS 120Ah packs since October. Zero comebacks. Every customer texts us photos of their dash showing ‘120Ah’—they’re thrilled.”
— Urban EV Solutions, Amsterdam
Frequently Asked Questions: Wholesale BMW i3 120Ah High-Voltage Battery
Q: Does it work in pre-2019 i3 models?
A: Yes—with minor wiring adaptation (provided free). Full functionality confirmed on 2017–2021 i3s.
Q: Is the BMS locked or require coding?
A: No. It uses open, OEM-matching CAN messages—the i3 recognizes it natively.
Q: What’s the real-world range?
A: 270–295 km in mixed driving (depending on climate, tire pressure, and driving style).
Q: Can I get technical support during install?
A: Absolutely. CNS offers lifetime remote assistance, including live video guidance for first-time installs.
Q: Are these packs tested before shipping?
A: Yes—every unit undergoes full charge/discharge validation, insulation resistance test, and CAN communication verification.
A True 120Ah Battery Should Feel Like the Car Never Aged
And with CNS, it does.
Stop Letting Degraded Packs Ground Functional i3s—Stock Wholesale BMW i3 120Ah High-Voltage Batteries That Deliver Authentic Performance, Full System Recognition, and Profit Margins That Make Every Replacement Job Worthwhile.
Because sustainability starts with keeping good cars on the road—not sending them to scrap.
Secure Your 2026 Wholesale Allocation Today—Get Volume Pricing, Global Shipping, and Full Technical Backing for Every BMW i3 120Ah Battery You Install:
👉 https://cnsbattery.com/ev-battery-home/ev-battery-contact/