smart #3 vs BYD Yuan PLUS: Which Compact Electric SUV Fits You in China
The smart #3 and the BYD Yuan PLUS make a worthwhile pair to weigh side by side among compact electric SUVs (battery electric vehicles, or BEVs) in China. The smart #3 comes from smart Automobile, the joint venture between Mercedes-Benz and Geely, built in China by Geely on a Mercedes-led design, giving it a European brand feel. The BYD Yuan PLUS is the same car BYD sells abroad as the Atto 3, BYD's high-volume global compact. Both are pure electric, so neither ever needs petrol, but they pull in two directions: one leans on design and brand feel, the other on value, a bigger battery and more range, a roomier-feeling cabin, and BYD's wide dealer reach. This guide weighs them qualitatively from the angle you actually feel: price, battery and range, space, charging, and battery care. One note up front: BYD launched a new third-generation Yuan PLUS in May 2026 (800V, flash charging, longer range), but that is not the car in this site's data, and this guide compares the second-generation car on sale now. The exact figures (cost, time, and realistic range adjusted by test cycle) live on this site's comparison tool and per-car pages.
By mht-dev, Frontend Engineer & Creator
A frontend engineer who bought a first electric car in March 2026 and built EV Charge Calculator while working out the real cost of charging it, writing every guide from an everyday new EV owner's perspective.
Two compact electric SUVs, two different leanings
The smart #3 and the BYD Yuan PLUS chase the same buyer: someone who wants a compact electric SUV that is easy to park and drive, mostly for the city but able to stretch its legs now and then. Their characters differ, though. The smart #3 comes from smart Automobile, the Mercedes-Benz and Geely joint venture, with the whole car built in China by Geely on Geely's SEA electric platform, and a Mercedes-led design inside and out that plays up nimbleness, style, and a European brand feel (sources: CnEVPost, carnewschina, 2023 to 2025). Its body is more compact, so it is agile to drive and easy to park.
The BYD Yuan PLUS takes a different road. It is the same car BYD sells abroad as the Atto 3 in markets such as the UK, Germany, Brazil, Thailand, and Australia, BYD's high-volume global compact (source: Wikipedia, BYD Atto 3). It has a larger body and roomier cabin, a bigger battery with a longer rated range, and usually a more value-led price, backed by BYD's nearly ubiquitous sales and service network in China. So the question is not which car is better, but whether you lean toward the smart #3's design and brand feel, or the Yuan PLUS's value, range, space, and dealer reach. The rest of this guide takes them one at a time.
Price, battery, and range: the Yuan PLUS packs more battery and goes further
On the figures that matter most, the BYD Yuan PLUS leads on several fronts. On battery, the second-generation Yuan PLUS carries an LFP Blade pack whose usable capacity is clearly larger than the entry smart #3, and a bigger battery plus a longer CLTC rating means the Yuan PLUS travels further between charges and needs topping up less often. On space, the Yuan PLUS is slightly longer (about 4455 mm, against roughly 4400 mm for the smart #3) and, with its flat floor, offers a roomier-feeling rear seat and boot that suit a family's daily life and the occasional trip better (sources: this site's cn.ts configuration and autohome, as of 2026-06-03). On price, the Yuan PLUS has long been a value champion and usually undercuts a comparable smart #3, though you should confirm the current quote with a dealer.
The smart #3 is not without answers: it is more compact and agile, easier to park, and its Mercedes-led design and brand feel are its real draw, with strong appeal to buyers who value personality and a sense of refinement. One honest caveat applies to both: their ranges are quoted on China's CLTC test cycle. Because both use the same cycle, the comparison between them is fair and neither gains a brochure advantage. But CLTC is optimistic, so both claimed ranges sit above what either car will actually do on China's roads with the air-conditioning on and a full load aboard. Lean on the realistic-range estimates this site shows, which discount each maker's claim by its test cycle rather than printing the raw brochure figure.
A heads-up: a new third-generation Yuan PLUS is out, but it is not this car
Before you buy a Yuan PLUS, one thing is worth knowing. On 21 May 2026 BYD launched a new third-generation Yuan PLUS: built on a revised 800V e-Platform 3.0 with the second-generation Blade Battery, headlined by flash charging (BYD claims it can go from 10 percent to 70 percent in about five minutes), offered with packs of roughly 57.5 kWh and 68.5 kWh, a CLTC rating of up to about 630 km, and a starting price around RMB 119,900 (sources: CnEVPost, 12 and 21 May 2026; carnewschina, 15 April 2026; Electrek, 21 May 2026). It is a clearly upgraded car, but it is not the Yuan PLUS in this site's data.
This site's Yuan PLUS data corresponds to the second-generation car on sale now (its LFP Blade battery, the capacity, DC fast-charge capability, and CLTC range recorded here). For the comparison to stay accurate, this guide does not fold the third generation's 800V, flash charging, or longer range into the Yuan PLUS's case. If you are about to order, confirm with the dealer which generation, trim, and range you are buying, then come back and compare on this site using the matching figures. Whenever this guide refers to the Yuan PLUS, it means the second generation.
Battery care: both are LFP, so the rules are the same
On battery care, the two cars are level. The smart #3 uses an LFP (lithium iron phosphate) battery, and the second-generation BYD Yuan PLUS uses BYD's own LFP Blade battery, also lithium iron phosphate (sources: ev-database.org car/2052; this site's cn.ts, as of 2026-06-03). LFP chemistry is robust, tolerates routine charging to 100 percent without the accelerated-wear worry that some other chemistries carry when charged full daily, and tends to age gracefully, which is exactly what you want in a car you plug in every night. The practical result is that the battery-care rules are identical on both cars, and you do not have to change your charging habits switching between them.
Stating this plainly matters, because it takes battery care off the tiebreaker list entirely. With chemistry no longer a dividing line, what genuinely decides the choice falls back to price, battery and range, space, the charging experience, and the smart #3's design and brand feel versus the Yuan PLUS's value and dealer reach.
Charging: the smart #3 has measured data, the Yuan PLUS leans on the network
Charging is the one area where this pair sits at different tiers and needs careful wording. The smart #3 is Tier-1 on this site, meaning it has measured charging data: by EV Database measurement of its LFP entry version, it charges from 10 percent to 80 percent in about 32 minutes, with a DC fast-charge peak around 130 kW (source: ev-database.org car/2052, Smart #3 Pro, 47 kWh usable LFP, as of 2026-06-03). That is the smart #3's own measured figure and is safe to cite. The BYD Yuan PLUS is Tier-2 on this site: we do not have an authoritative measured charging curve strictly matched to its battery version, so this site does not give the Yuan PLUS a specific charge-time-in-minutes or peak-power figure, and it does not make a who-is-faster cross-comparison between the Yuan PLUS and the smart #3. This is deliberate restraint, so an unmeasured number is never presented as a fact.
Setting specific numbers aside, the bigger charging difference between the two in China is the network and your habits. Either way, the cheapest daily routine is to top up at home on AC and save the dearer public DC fast charging for trips. The Yuan PLUS's bigger battery means an occasional full charge from a low state takes a little longer in exchange for more range and fewer top-ups, while the smart #3's smaller battery has less total energy to put in to fill up. To see how much a public fast charge versus a home charge actually differs on your own electricity tariff, put both rates into the charging cost calculator at /cn. For operators, QR-code payment, and the fast-charge network in China, see this site's guide to public EV charging in China.
Which suits you: design and brand feel, or value, range, and dealer reach
Pull the breakdown into one honest verdict. If you most value a compact, agile body, easy city manners, and the Mercedes-led design with its European sense of refinement, the smart #3 is right up your street, with measured charging data on this site as a bonus, at the cost of a smaller battery, a shorter claimed range, and relatively more compact space. If you want the bigger battery, the longer range, the roomier-feeling family space, and the more value-led price, plus BYD's nearly ubiquitous sales and service network, the second-generation BYD Yuan PLUS is the more natural pick.
Because both are LFP BEVs, battery care is equal between them and is not a tiebreaker, and on charging this site cites only the smart #3's own measured data and makes no cross-comparison of charging speed. And remember that the Yuan PLUS in this guide is the second generation on sale now, while the new third generation is a different car. To close your decision with real numbers, open the comparison tool prefilled with the smart #3 and the Yuan PLUS side by side, read the smart #3's own page and the Yuan PLUS's own page for the full spec and realistic-range breakdown, then run the charging cost calculator at /cn to see what each car costs to charge on your own electricity tariff.
Frequently asked questions
Which has the bigger battery and longer range, the smart #3 or the BYD Yuan PLUS?
- The second-generation BYD Yuan PLUS. Its LFP Blade pack has a usable capacity clearly larger than the entry smart #3, and its CLTC rating is longer too, which means it travels further between charges and needs topping up less often (source: this site's cn.ts configuration, as of 2026-06-03). One caveat applies to both, though: the rated ranges are measured on the optimistic CLTC cycle, so real-world range runs lower. Because both use the same cycle, the comparison between them is fair, but you should still go by this site's realistic-range estimate, discounted by each car's test cycle, rather than the brochure number. You can see the two side by side on this site's comparison tool, prefilled with both cars, and on each car's own page in China.
What brand is the smart #3, Mercedes or Geely?
- Both are involved. The smart #3 comes from smart Automobile, the joint venture between Mercedes-Benz and Geely: Mercedes leads the design, Geely builds the car in China, and the whole vehicle sits on Geely's SEA electric platform (sources: CnEVPost, carnewschina, 2023 to 2025). So it carries Mercedes design and brand feel together with Geely's engineering and manufacturing, giving it a European-brand, made-in-China character. By contrast the BYD Yuan PLUS is BYD's own car, sold abroad as the Atto 3. If you value design and brand feel, the smart #3 is the standout of this pair.
Does the BYD Yuan PLUS charge faster than the smart #3, and is battery care the same?
- On charging speed this site cites only measured figures. The smart #3 is Tier-1, meaning it has measured charging data: it charges from 10 percent to 80 percent in about 32 minutes, with a DC peak around 130 kW (source: ev-database.org car/2052, Smart #3 Pro, 47 kWh usable LFP, as of 2026-06-03). The second-generation BYD Yuan PLUS is Tier-2, and this site has no authoritative measured curve strictly matched to its battery version, so it gives the Yuan PLUS no specific charge-time or peak-power figure and makes no who-is-faster cross-comparison, to avoid presenting an unmeasured number as a fact. On battery care, both are LFP (lithium iron phosphate), both tolerate routine charging to 100 percent, and the care rules are identical, so it is not a tiebreaker. For the exact charging cost on your own tariff in China, use the calculator at /cn.
I have seen a third-generation Yuan PLUS, which one does this site compare?
- This site compares the second-generation BYD Yuan PLUS on sale now (its LFP Blade battery, the capacity, DC fast-charge capability, and CLTC range recorded here). BYD did launch a new third-generation Yuan PLUS on 21 May 2026: built on a revised 800V e-Platform 3.0 with the second-generation Blade Battery, headlined by flash charging (BYD claims about 10 percent to 70 percent in roughly five minutes), with packs of about 57.5 kWh or 68.5 kWh, a CLTC rating of up to around 630 km, and a starting price near RMB 119,900 (sources: CnEVPost, carnewschina, Electrek, April to May 2026). That is a clearly upgraded new car, but it is not the one in this site's data. If you plan to order, confirm with the dealer which generation and trim you are buying, then compare on this site using the matching figures.