How Blade Cells Sit in a Seagull Pack

The Seagull pack is a floor of long lithium iron phosphate Blade cells, not a generic “small EV battery” slogan. In China the car is Seagull. In several export files the same family is Dolphin Mini or Dolphin Surf. The teaching sheets for this article are first-party PDFs that print two recurring usable capacities: 30.08 kWh and 38.88 kWh, both labelled Blade. A Kenya Dolphin Surf specification lists those two figures with NEDC 300 km and 400 km, AC at 6.6 kW, and DC at 30 kW on Comfort and 40 kW on Dynamic. A Brazil Dolphin Mini technical sheet dated 13 July 2026 again prints 30.08 and 38.88 kWh, with local PBEV ranges of 224 km and 280 km and the same 30 kW and 40 kW DC split. Those numbers are sheet-specific. They are not a global stock list.

This is an education file, not a ranking of city cars. AutoCN will help you keep chemistry, capacity, and test cycle in separate cells. It will not invent a third capacity because a forum mentioned 43.2 kWh, and it will not convert one cycle into another as if they were equal.

What Blade is doing in a city-car floor

Blade, in BYD’s own language on its passenger-car pages, is a lithium iron phosphate cell shaped as a long thin prism and stacked as structural beams inside the pack. The company says the array plus upper and lower panels behaves like a honeycomb in the vertical direction, that LFP releases heat slowly and does not release oxygen the way some oxide cathodes can, and that a nail-penetration demonstration ended without fire or smoke with surface temperatures in a 30 to 60 °C band. Those are manufacturer sentences. They explain why a Seagull can carry LFP in a thin floor. They are not a crash-star certificate for your VIN and not a proof that every small Chinese EV uses the same cell.

Cell-to-pack, in this context, means the published story is cells arranged as the pack structure rather than a stack of unrelated modules you never see. For a buyer, the practical test is simpler: the booklet should name Blade or LFP, the capacity row should match the VIN, and the thermal system should be named. The Kenya Surf sheet lists a power-battery temperature-control system. If that line is missing on the car you are buying, do not assume the Kenya row.

Why two capacities keep appearing

30.08 kWh and 38.88 kWh recur because they are the two China-family packs that export documents keep reprinting. They are different energy answers, not trim nicknames. The larger pack on the Kenya sheet is the 400 km NEDC row and the 40 kW DC row. The smaller pack is the 300 km NEDC row and the 30 kW DC row. Brazil’s July 2026 sheet keeps the same kilowatt-hours and changes the range standard to PBEV 224 km and 280 km. That is the lesson: capacity can travel; the kilometre line does not travel with it.

Other markets have published other packs. Secondary encyclopaedia pages describe a 43.2 kWh Blade pack on some Europe and Australia upper trims with a different motor rating. This article will not treat that figure as a first-party fact until you hold the local PDF. If your destination sheet prints 43.2 kWh, copy that row. If it does not, do not import the encyclopaedia into the contract.

A reading table for Seagull-family packs

Cycles, connectors, and the small-car charge curve

A city-car pack is limited as much by the charge curve as by kilowatt-hours. Thirty or forty kilowatts of DC is a published peak on the sheets cited here, not a 10-to-80-minute promise unless the sheet also prints a window. The Kenya file lists those DC peaks beside the two packs. Plan depot time from the peak and from a measured curve on the VIN, not from a Han 120 kW rumour. AC at 6.6 kW is an overnight answer when the inlet and the house circuit match. It is not a destination-standard conversion.

Connectors travel badly. A Type 2 / CCS2 car is not a GB/T car. Photograph the inlet. If the destination has no written adapter path, the chemistry lecture is finished and the deal should stop. V2L, where a sheet lists it, is an outlet rating on a label, not a worksite generator.

Range education is the other half of the pack story. CLTC, NEDC, WLTP, EPA, and Brazil’s PBEV are different procedures. The same 38.88 kWh pack is 400 km NEDC on the Kenya Surf sheet and 280 km PBEV on the Brazil July 2026 sheet. Anyone who “converts” those figures with a private percentage is inventing a third test. Keep the cycle name glued to the number. AutoCN’s guides can hold that glue. They cannot make two laboratories agree.

What the floor does not tell you

Pack energy does not tell you crash stars, software maps, or spare-cell availability. e-Platform 3.0 appears in BYD’s small-car story as the skateboard under Seagull and Dolphin. Use it as a family label. Do not use it as a parts-interchange guarantee with a larger BYD. Cell format can be shared in language and still differ in module count, voltage, and thermal plumbing. Order parts from the VIN, not from the word Blade. The parts pages are a research start, not a warehouse list.

Used packs need a state-of-health report, a charge-history question, and a thermal-event question. This page will not call any used Seagull pack healthy. If the report is missing, the educational file is complete and the buying file is not.

Who should stop treating all city EVs as one pack

Stop if the brief needs Han-class DC peaks and the only argument is that “Blade is Blade.” Stop if the only range in the file is a China CLTC screenshot pasted onto a Brazil PBEV car. Stop if the seller cannot show which of 30.08 or 38.88 kWh is in the floor. Stop if the name on the tailgate is Dolphin Mini and the booklet is a Seagull page from a different year with no capacity row. The small BYD city car can be the right pack for a short urban loop whose inlet matches the house. It is the wrong pack for a motorway brief built on a 400 km NEDC line treated as winter fact.

Frequently Asked Questions

Is the Seagull battery the same as the Han battery?

Both are described as Blade LFP. They are not the same pack. Han Europe pages describe a large saloon pack and a silicon-carbide drive story. Seagull-family PDFs print 30.08 or 38.88 kWh and 30 or 40 kW DC. Chemistry family is not capacity, voltage, or charge curve. Read the row on the VIN.

Which Seagull pack should a buyer choose?

Choose the capacity that still closes the longest regular trip after you treat the labelled cycle as a laboratory line and keep a reserve. The 38.88 kWh row is the larger energy answer on the Kenya and Brazil sheets cited here. It is not automatically the right car if the extra mass, price, or DC peak does not match the brief. This page will not pick a trim.

Why do two official PDFs disagree on kilometres?

They use different test labels. Kenya prints NEDC. Brazil’s 13 July 2026 sheet prints PBEV. The kilowatt-hours match; the procedures do not. Keep both numbers. Do not average them.

Does a nail-penetration story mean the pack cannot catch fire?

No. It is BYD’s published demonstration language for Blade chemistry. Put it in the chemistry cell as a manufacturer claim. Thermal-runaway behaviour in a wreck, a flood, or a poorly repaired pack is a different file. This page will not convert a demonstration into a guarantee.

Can AutoCN confirm a 38.88 kWh car is waiting in a yard?

No. AutoCN is a sourcing and information platform. A thumbnail on the BYD brand page is not inventory and not a pack certificate. Ask for a VIN, a capacity row, and a dated offer. Use contact to keep the file in order.

Should I convert CLTC kilometres into miles for a customer?

You may convert units inside the same test. You may not convert CLTC into WLTP or NEDC into PBEV. If the customer needs a local-cycle figure that was never published, the honest cell is empty.

Keep the pack boring, then keep the name honest

A Seagull-family pack is understandable when the boring cells close: Blade or LFP named, 30.08 or 38.88 kWh copied from the sheet you hold, cycle name glued to the kilometre line, AC and DC peaks copied, inlet photographed, and no third capacity invented from an encyclopaedia. It fails when Blade is used as a magic word. The Kenya Surf PDF and the Brazil 13 July 2026 Dolphin Mini sheet are strong teaching documents and weak global rumours. Use them as the first. Refuse them as the second. AutoCN will help you keep the cells in order. It will not sign the chemistry for you.