Some tests intentionally exceed normal conditions. Never exceed the manufacturer datasheet voltage, current, time, or temperature limits in a device or pack.
Independent 18650 and 21700 cell testing
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.
Explore every cell. Compare two for free. Create a free account with Google or email. No credit card or Patreon account is needed. Compare any two cells in Simple mode and explore five sample cells in Advanced, using tests up to 45 A.
Your access to the test bench
Browse cell specifications and datasheets without signing in. Create a free account to compare up to two cells in Simple mode at currents up to 45 A.
Use Continue with Google or enter your email and a password. Your name is optional. You can start comparing immediately, with no Patreon connection or payment. The free Advanced demo includes EVE 26VA, EVE 33VA, EVE 35V, Reliance RH60, and Amprius SA110.
Create free accountSign in to your free website account, open Membership, and choose Connect Patreon. Use the Patreon account that holds your paid BatteryRealData membership and approve the connection. You will return here to see your verified access. All paid tiers include full Advanced features, cycle-life results, live streaming, and the Battery Decoder. Patreon handles billing.
Try all cells in Advanced for 7 days. Eligible linked free Patreon members can choose to start a one-time trial of ordinary comparisons up to 45 A. Existing trials keep their original expiration date. Cycle-life results, the decoder, live streaming, and tests above 45 A remain paid. Starting a trial does not create a paid subscription or automatically charge you. Check trial eligibility.
Basic cell pages, manufacturer datasheets, builder tools and calculators, free test examples, safety, and methodology remain open to everyone. The Battery Decoder requires paid access. Need help? Read the connection guide.
Start here
No technical background is required. Simple view explains the essentials; Advanced view keeps every engineering control.
The BatteryRealData method
Capacity, continuous current, temperature limits, pulse ratings, cycle life, and dimensions.
Raw and usable mAh, voltage under load, Wh, temperature, heat soak, power, and runtime.
BRD notes and scores explain the result without hiding incomplete tests or stress-test context.
Overrated claims are called out. Underrated cells that exceed a claim are recognized too.
Read the scoring and test methodologyReal cells, real evidence
Browse photos and manufacturer ratings freely, then sign in for Simple comparisons of all cells and the five-cell Advanced demo.
Five-minute walkthrough
The video shows how to choose tests, read the curves, understand heat and voltage sag, and move between Simple and Advanced views.
Live command center
Follow live voltage, current, power, temperature, cameras, charge-back capacity, and recovery.
Open live testingManufacturers and cell owners
Submit a model and datasheet for consideration. Results remain honest whether they are good or bad.
Request testingBattery builder tools
Use battery-focused calculators with plain-language explanations and conservative inputs.
Open toolsDatabase status
Your available test conditions appear after sign-in. Free comparisons include currents up to 45 A. Tests above 45 A require a paid subscription.
Latest results
Compare the same current across cells. Your account determines which test conditions are available.
| Cell | Sample | Mode | Current | Usable capacity | Raw Wh | Max temp | Status | Report |
|---|---|---|---|---|---|---|---|---|
| Checking access to test results... | ||||||||
Tenpower 60XG
Molicel P50B
Ampace JP50P1
EVE 50PL