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
Find the cell. Check the conditions it was rated at.
Every value keeps its rate, temperature and cut-off, and links to the document it was read from. Where the document says nothing, the field stays empty.
The whole library
Every accepted record, one table.
Filter by technology, chemistry, format and maker; sort by how much the source states; read the full record with its quotes; export CSV.
Open the full finder Browse the battery pages3,455battery records
178electrical components
228cells with capacity, nominal voltage and mass
26with a continuous discharge rating
38with a cycle-life figure
01 / Shortlist for Design
Cells with a Design model
Loading sourced cell records…
This list is the subset of the library that Design can size a pack with; shortlist up to three and carry them across. The full finder holds every accepted record. Library on GitHub · Components and BMS · Technology dates and coverage
Data: Lemonergy contributors · CC BY 4.0 · Source snapshot
02 / Compare your shortlist
The details, side by side.
Add up to three cells from the results to compare values and measurement conditions.
Carry your cells, screening limits and sources into Island 03. Cells without a Design model stay visible for review.
Open cycling data · XJTU and CALCE
How cells lost capacity, cycle by cycle.
Discharge capacity per cycle from two open ageing datasets: XJTU’s 55 Lishen 18650 NMC523 cells (2.0 Ah, six test programmes) and CALCE’s 15 CS2 prismatic LCO cells (1.1 Ah, six test types). The values are computed from the published files and kept in the library; the chart is drawn here from them.
Dataset pages: XJTU 2024 · CALCE CS2 · all open ageing data
Loading the cycle data…
Point at or touch a chart to read every cell’s value at that cycle. Drag across it with a mouse to zoom in. Select a cell in the legend to hide or show it.
| Cell | Cycles run | Points drawn | First (Ah) | Last (Ah) | Last / first |
|---|
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 same records, one request away.
Search, fetch a full record or compare cells from a script, a spreadsheet or your own application. Every response names the catalog release it came from.
curl "https://design.lemonergy.com/api/data/demo/v1/batteries?q=21700" # one record, with every observation and its conditions curl "https://design.lemonergy.com/api/data/demo/v1/products/cell/samsung-sdi/inr21700-50e"
No key needed for the demo: 40 requests / hour, 5 results per request. A free key lifts the cap; €9 / month buys 10,000 requests / month for code that runs every day. Reference and plans →
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.