Keep the conditions.
A capacity at 0.2 C is different from one at 1 C. Values travel with their units, conditions and statistic.
02 / Lemonergy Data
Battery data.
With the details.
See the whole catalog at once — and what it does and does not publish. Put every cell of a class on two axes, place one cell among cells of its own size, find what fits the slot you have, then read the record and run two of them on the same mission.
No account, no key, no card. The demo queries the same API your tools would.
—catalog products · cells and components
—recorded observations
—manufacturers covered
Live from the API
Catalog
Before you ask anything
The catalog, counted live.
Every panel below is drawn from one request to the live API. Change a filter and it asks again. What the catalog cannot answer for is counted on the face of each panel rather than left out of it.
Where the products sit
Bin counts, not points: how many products fall in each square of the two axes you chose.
What is published
How many products in this cohort state each quantity — and how many do not.
The spread
Where the middle is, and how wide the field is, for the numbers an engineer chooses on.
The cell, against its peers
Compare cells.
Every cell of a class on two axes, one cell's place among cells of its own size, and what fits the space you have. The chart is the whole population — naming its points is what a key opens up.
The field
Every cell of this cohort that publishes both axes, as a point. The strongest few are named; pick one to place it.
Named on this chart
The highest by the metric you chose. Choosing one places it among cells of its own size.
This cell, among its own size
A percentile inside the narrowest cohort that holds enough cells to mean something. A metric the datasheet does not publish says so instead of showing a bar.
Same envelope
The cells that fit where this one fits, within a tolerance you set.
What fits the space you have
Give a box or a cylinder in millimetres. A cell fits if its stated dimensions fit yours in some orientation — clearance, tabs and swelling are yours to add.
Give a whole space — a box or a cylinder, not part of one.
Who is in the library, and what their datasheets state
What this layer cannot chart yet
Ragone plots, impedance spectra and cycle-life scatter are not here, because too few of the accepted datasheets state their inputs. These counts come from the live release, so they move as the library grows — and they are the acquisition list, not a disclaimer.
Every panel in this section is one request to the same open API your tools would call. A value is stated, derived from named stated inputs, or absent — and an absent one is counted here rather than dropped.
The real thing, right here
Search the catalog.
This searches the live API. Open a record to read its specifications with their conditions, or inspect the exact JSON your code would receive.
Source-linked specifications
Choose a record
GET
Live records. Original units. Missing conditions stay visible instead of being filled in.Every value keeps the manufacturer document it was read from
02 / Compare
Compare cells, with context.
Pick two or three cells. Compare their published specifications, or simulate equivalent packs for the same mission. Every result keeps its measurement conditions and input assumptions.
Nothing selected yet. Use Compare beside a search result.
Select two or three cells to begin.
The datasheets, side by side
A row is comparable only when its values were measured alike. Derived values name what they were derived from. A gap is a gap.
GET
Specifications retain their original conditions. Mission comparisons use the same requested pack energy, voltage, power and ambient temperature.Every simulator input names its basis: stated, your assumption, or class-typical
03 / Conclusions
What does the comparison tell you?
A useful conclusion names the result, its evidence and what still needs checking.
Run a comparison to see the findings for your selected cells. Conclusions apply to that comparison and its conditions.
StatedPublished in the source document.
CalculatedDerived from stated values; inspect the inputs.
AssumedYour value or a class-typical model input.
MissingNo supported value. Keep the gap visible.
Trace the evidence.
Follow the source document and its page or section reference. Inspect the record behind a result.
Build on a clear version.
API responses identify the source revision. Keep a reference you can return to as the library grows.
Bring it into your tools
The demo above is the API.
Eight endpoints, a no-key demo tier and a €9 plan for daily use. The reference and the plans have their own page.
curl "https://design.lemonergy.com/api/data/demo/v1/batteries?q=21700" curl "https://design.lemonergy.com/api/data/demo/v1/compare?products=cell/molicel/inr21700-p50b,cell/samsung-sdi/inr21700-50e&mission=evtol-hop"
No key needed for the demo: 40 requests / hour, 5 results per request, Compare up to 3 cells on a mission. A free key lifts the cap (100 requests / month; Compare up to 8 cells, 10 passes of a mission); €9 / month buys 10,000 requests / month for code that runs every day. Endpoints:
/api/data/v1/batteries, /products/{uid}, /api/data/v1/compare, /api/data/v1/missions and four more on the reference.Something missing?
Tell us which cell you need.
The catalog grows from real engineering questions. Send the manufacturer and model, or the datasheet, and it joins the review queue with its conditions and sources intact.