Smart #1 and #3 Battery: Complete Guide
The Smart #1 and Smart #3 share the same 66 kWh NMC battery (62 kWh usable) on Geely’s SEA platform — also used in the Volvo EX30 and Zeekr X. An entry-level 49 kWh LFP variant is available in some markets. The #1 delivers up to 273 miles WLTP (Premium with heat pump); the sleeker #3 reaches 283 miles WLTP from the same pack. DC fast charging peaks at 150 kW on 66 kWh models, completing 10–80% in approximately 30 minutes. Smart is a Mercedes-Benz and Geely joint venture — combining German design with Chinese EV engineering.
Smart #1 and #3 Battery: Full Specs
| Model / Trim | Battery | Chemistry | WLTP Range | Power | 0–62 mph | DC Rate |
|---|---|---|---|---|---|---|
| #1 Pro (entry, some markets) | 49 kWh (47 usable) | LFP | 193–202 miles | 200 kW (268 hp) RWD | 6.7 sec | 130 kW |
| #1 Pro+ / Premium | 66 kWh (62 usable) | NMC | 260–273 miles | 200 kW (268 hp) RWD | 6.7 sec | 150 kW |
| #1 Brabus | 66 kWh (62 usable) | NMC | 248 miles | 315 kW (422 hp) AWD | 3.9 sec | 150 kW |
| #3 Pro | 49 kWh (47 usable) | NMC | 202 miles | 200 kW (268 hp) RWD | 5.8 sec | 130 kW |
| #3 Pro+ / Premium | 66 kWh (62 usable) | NMC | 270–283 miles | 200 kW (268 hp) RWD | 5.8 sec | 150 kW |
| #3 Brabus | 66 kWh (62 usable) | NMC | 258 miles | 315 kW (422 hp) AWD | 3.7 sec | 150 kW |
Geely SEA Platform: Shared With Volvo EX30
Smart was relaunched in 2022 as a Mercedes-Benz and Geely joint venture. Both partners contribute equally — Mercedes provides design direction, brand heritage, and European market expertise. Geely contributes the Sustainable Engineering Architecture (SEA) platform, battery systems, and manufacturing capability. The SEA platform is also used in the Volvo EX30, Zeekr X, and Zeekr 001 — sharing proven EV underpinnings across a large Geely family. All Smarts are built in China at Geely’s Yichun factory.
The 66 kWh NMC battery provides 62 kWh usable — a 6.1% protective buffer. Active liquid thermal management maintains cell temperatures during charging and driving. The 150 kW peak DC charging rate enables 30-minute 10–80% sessions across #1 and #3 models with the large battery. The #3’s more aerodynamic coupe-SUV body gives it 10 more WLTP miles than the #1 from the identical 66 kWh pack — the shape matters at highway speeds.
Heat Pump: Premium and Above Only
A heat pump is included only on Premium trim and above on both the #1 and #3. Pro+ models use resistance heating — resulting in meaningfully shorter winter range. The Premium model’s heat pump improves winter range by approximately 15–25% and contributes to the higher WLTP figure (273 miles vs 260 for the Pro+). The heat pump makes Premium the recommended trim for UK and northern European buyers. DrivingElectric’s real-world Premium test returned over 230 miles in warmer weather — validating the efficiency benefit.
Smart #1 vs #3: Which Battery Suits Your Needs
The #1 and #3 share identical batteries and drivetrains — the choice is body style. The #1 is a compact 5-door crossover (4.27 m); the #3 is a coupe-SUV (4.4 m) with a sloping roofline, more boot space, and better aerodynamics for extra range. The #3 is 30 cm longer — most of this extra length goes to rear passenger and luggage space. Both share the same 6.7-second (#1) or 5.8-second (#3) 0–62 mph time from the 268 hp rear-drive motor. The Brabus variants add a front motor for 422 hp AWD in both body styles.
Smart #1 / #3 Charging Speeds
| Method | Power | 49 kWh (47 usable) | 66 kWh (62 usable) |
|---|---|---|---|
| Level 2 (7.4 kW) | 7.4 kW | ~7.5 hours full | ~10 hours full |
| Level 2 (22 kW, #3 Premium only) | 22 kW | — | ~3.5 hours full |
| DC Fast | 130 / 150 kW | ~30 min (10–80%) | ~30 min (10–80%) |
Real-World Range
- #3 Premium (66 kWh, heat pump), real-world test: Approximately 236 miles at 3.5 miles/kWh (DrivingElectric) — approximately 83% of the 283-mile WLTP claim
- #1 Premium, warm weather test: Over 230 miles achieved — consistent with the #3’s real-world efficiency given the similar aerodynamics
- #3 Brabus, spirited driving: Approximately 180–210 miles — the AWD dual-motor setup draws significantly more energy under acceleration
- Cold weather (Pro+ without heat pump): Approximately 175–205 miles — heat pump’s absence reduces winter range meaningfully
Battery Warranty
Smart covers the #1 and #3 batteries with an 8-year / 100,000-mile warranty against capacity falling below 70% of original. The vehicle warranty is 3 years / unlimited mileage — standard for the class. Annual NMC degradation is approximately 1.5–2.5% per year under normal conditions. The LFP 49 kWh entry model’s chemistry supports daily 100% charging; NMC 66 kWh models should be set to 80% for daily use.
Smart #1 / #3 vs Competitors
| Model | Battery (Usable) | WLTP Range | DC Rate | Heat Pump | Starting Price (UK) |
|---|---|---|---|---|---|
| Smart #1 Premium (66 kWh) | 62 kWh NMC | 273 miles | 150 kW | Standard | ~£39,500 |
| Volvo EX30 LR Single Motor | ~49 kWh NMC | 298 miles WLTP | 153 kW | Standard | ~£35,000 |
| CUPRA Born (66 kWh V3) | ~74 kWh NMC | ~342 miles | 170 kW | Optional (£970) | ~£40,000 |
| VW ID.3 Pro S (58 kWh) | ~58 kWh NMC | 265 miles | 183 kW | Optional | ~£36,000 |
Charging Tips for Smart #1 / #3 Owners
- Set daily charge to 80% on 66 kWh NMC models: NMC benefits from avoiding constant 100% — 80% of 62 kWh provides ~50 kWh covering 175+ miles of daily driving
- LFP 49 kWh models: charge to 100% daily: The entry LFP battery supports and benefits from regular full charges — set a daily 100% schedule
- Choose Premium for winter driving: The heat pump on Premium trim provides approximately 50 extra miles of range in cold conditions — the most impactful single upgrade available
- #3 Premium owners: use 22 kW AC charger: The #3 Premium gets a 22 kW AC onboard charger — use three-phase public chargers for significantly faster top-ups vs the standard 7.4 kW
Conclusion
The Smart #1 and #3 battery delivers 66 kWh NMC (62 kWh usable) in one of Europe’s most distinctive compact electric SUV designs — combining Mercedes heritage styling with Geely SEA platform technology. The 273–283 miles WLTP range, 150 kW DC charging, and 268 hp rear-wheel drive are competitive in the class. The heat pump’s restriction to Premium and above is the key limitation for most buyers. For buyers who choose the Premium trim with heat pump, the real-world 230+ mile range and 3.9-second Brabus AWD option make the Smart range genuinely compelling in 2026.
