BMW i3 Battery Upgrade for REX Models 2026: Unlock Longer Range & Reliability
Is Your BMW i3 REX Struggling with Short Ranges? It’s Time for an Upgrade.
The BMW i3 REX (Range Extender) is a brilliant hybrid—electric efficiency meets backup gasoline power. But by 2026, even the best batteries degrade. Are you tired of:
- 🔋 70 miles of range instead of the original 150+?
- ⛽ Frequent refueling stops because the battery can’t hold a charge?
- 💸 High replacement costs from dealers offering OEM batteries at double the price?
You don’t have to settle. A battery upgrade for your 2026 BMW i3 REX isn’t just possible—it’s affordable, reliable, and smarter than ever.
Why Upgrade Your BMW i3 REX Battery in 2026?
1. Degraded Performance? You’re Not Alone.
After 5–7 years, lithium-ion batteries lose 20–30% capacity. For REX owners, this means:
- Shorter electric-only range (as low as 50 miles)
- Increased reliance on the gas engine (negating EV benefits)
- Slower charging times (due to cell imbalance)
Real story: A 2018 i3 REX owner in California upgraded to a CNS 62kWh battery after his range dropped to 65 miles. Now, he drives 210 miles on electric alone.
2. OEM Batteries Are Overpriced (and Outdated).
BMW’s official replacement battery costs 12,000–15,000—and it’s the same tech as your 2016 model. Why pay more for less?
CNS BATTERY’s solution:
- 62kWh capacity (vs. OEM’s 42kWh)
- Modern CATL cells (20% more efficient)
- 50% lower cost (7,800–9,500)
3. Seamless Installation for REX Models
Worried about compatibility? Our batteries are:
- 100% VIN-matched (fits 2016–2026 i3 REX)
- Plug-and-play (no dealer programming needed)
- Gas engine integration-ready (works with REX system)
Pro tip: Use our https://cnsbattery.com/ev-battery-home/bmw-ev-batteries/bmw-i3-series-battery/ before ordering.
The CNS BATTERY Upgrade: What You Get
✔️ Next-Gen Battery Tech
- CATL LFP cells (safer, longer-lasting than NMC)
- IP67 waterproof rating (handles rain, snow, and car washes)
- Smart BMS (Battery Management System)
- Real-time cell balancing
- Overcharge/overheating protection
- Mobile app integration (coming 2026)
✔️ Cost Savings That Add Up
| Feature | OEM Battery | CNS BATTERY Upgrade |
|---|---|---|
| Price | $14,000 | $7,800 |
| Warranty | 12 months | 24 months |
| Capacity | 42kWh | 62kWh |
| Shipping | $500+ | Free (global) |
✔️ Peace of Mind Guaranteed
- 24-month/80,000km warranty (industry-leading)
- Free installation support (video tutorials + live chat)
- 100% refund policy (if not compatible)
FAQ: BMW i3 REX Battery Upgrades
Q: Will an upgraded battery void my BMW warranty?
A: No. Our batteries are OEM-compatible and don’t modify your car’s software.
Q: How long does installation take?
A: 2–3 hours for DIY (with our video guide). A mechanic can do it in 1 hour.
Q: Can I still use the gas engine after upgrading?
A: Absolutely. The REX system works seamlessly with our battery.
Q: What’s the lifespan of a CNS battery?
A: 8–10 years (vs. 5–7 years for OEM). We use automotive-grade cells tested to 1,500+ cycles.
Ready to Upgrade? Here’s How to Start
- https://cnsbattery.com/ev-battery-home/bmw-ev-batteries/bmw-i3-series-battery/ (enter your VIN or model year).
- Get a free quote (instant pricing, no hidden fees).
- Order online (secure checkout, global shipping).
Don’t let an old battery hold you back. With CNS BATTERY, your 2026 BMW i3 REX can drive farther, cleaner, and cheaper than ever.
👉 https://cnsbattery.com/ev-battery-home/ev-battery-contact/
Drive smarter. Drive longer. Choose CNS. 🚗💨