Independent 18650 and 21700 cell testing

BatteryRealData

Real cell tests. Datasheet claims checked.

See capacity, voltage sag, heat, energy, and discharge curves measured on the bench. When a cell meets, beats, or misses its datasheet claim, the evidence stays visible.

Compare cells Browse the cell library Watch a live test
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3.0Vusable-energy view

Start here

Pick what you want to do.

No technical background is required. Simple view explains the essentials; Advanced view keeps every engineering control.

01 Compare cells Put real curves and results side by side at the same current. Open comparison 02 Find a cell Filter by size, purpose, brand, capacity, rating, or tabless design. Open cell library 03 Watch live testing Follow voltage, current, heat, cameras, charge state, and recovery. Open live view 04 Learn the numbers Understand mAh, Wh, sag, heat, current ratings, and datasheets. Open learning center

The BatteryRealData method

The claim, the test, and the result.

Datasheet claim What the manufacturer promises

Capacity, continuous current, temperature limits, pulse ratings, cycle life, and dimensions.

Bench measurement What the cell actually delivers

Raw and usable mAh, voltage under load, Wh, temperature, heat soak, power, and runtime.

Clear result Where the evidence agrees or disagrees

BRD notes and scores explain the result without hiding incomplete tests or stress-test context.

Independent means honest in both directions.

Overrated claims are called out. Underrated cells that exceed a claim are recognized too.

Read the scoring and test methodology

Real cells, real evidence

Open one cell and see the complete story.

Photos, datasheet ratings, tested currents, BRD scores, heat behavior, and public results stay together.

See all cells
Tenpower 60XG cell Tenpower 60XG 21700 high-current evidence Molicel P50B cell Molicel P50B Datasheet vs real test results Ampace JP50P1 cell Ampace JP50P1 Capacity, sag, heat, and power EVE 50PL cell EVE 50PL Curves across multiple currents

Five-minute walkthrough

See how to compare cells and read a test.

The video shows how to choose tests, read the curves, understand heat and voltage sag, and move between Simple and Advanced views.

Watch on YouTube Learn at your pace

Live command center

Watch the next test happen.

Follow live voltage, current, power, temperature, cameras, charge-back capacity, and recovery.

Open live testing

Manufacturers and cell owners

Request an independent test.

Submit a model and datasheet for consideration. Results remain honest whether they are good or bad.

Request testing

Battery builder tools

Plan wires, strips, packs, and runtime.

Use battery-focused calculators with plain-language explanations and conservative inputs.

Open tools

Database status

Transparent public test data.

Catalog dates, available current levels, rankings, and incomplete-test warnings stay visible.

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Latest results

Newest published test runs

Open the reports or compare the same current across multiple cells.

View reports
Cell Sample Mode Current Usable capacity Raw Wh Max temp Status Report
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