
Don't let a dead battery catch you off guard. The WontPrix Battery Load Tester offers professional-grade diagnostics for DIYers and technicians alike. Instantly analyze voltage, internal resistance, CCA, and overall battery health on any 12V system with unmatched accuracy.




Don't waste hundreds at the mechanic guessing what's wrong. The WontPrix Battery Load Tester pinpoints the exact health of your battery, starter, and alternator in seconds. Know instantly whether to recharge, replace, or hit the road with total confidence.
WontPrix is fully compatible with a wide range of 12V batteries, including regular Flooded (Wet), VRLA, Maintenance Free (MF), SMF, AGM, EFB, and GEL cells. Whether it's your daily driver, boat, or recreational vehicle, this tester handles them all seamlessly.


Engineered to support 9 major measurement standards (CCA, BCI, CA, MCA, JIS, DIN, IEC, EN, SAE), WontPrix gives DIY mechanics professional-grade diagnostic depth. Easily record and replay battery data to track degradation and prevent costly roadside breakdowns.



"WontPrix delivers the performance and precision of a thousand-dollar shop scanner in a compact, cost-effective format. By accurately measuring internal resistance and CCA across all major standards, it completely takes the guesswork out of vehicle electrical diagnostics. Every garage needs one."
– Marcus Thorne, Master ASE Certified Automotive Technician


Perform battery health assessments, cranking starter tests, and alternator charging system evaluations with one simple tool.

Instantly measures voltage, internal resistance (mΩ), CCA capacity, and overall percentage of battery life to prevent surprises.

Compatible with CCA (100-2000), BCI, CA, MCA, JIS, DIN (100-1400), IEC, EN, and SAE standards for truly global compatibility.


Works seamlessly with Starting (SLI), Deep Cycled, and Marine batteries including Flooded, VRLA, MF, SMF, AGM, EFB, and GEL cells.

Easily capture and replay battery health trends and electrical tests to present diagnostic proof to customers or mechanics.

Easily switch operating system menus between English, German, French, Dutch, Russian, Spanish, Italian, and Portuguese.









We stand behind the quality of our WontPrix Battery Load Testers. Our support team is available 24/7 to assist with diagnostics, operations, and technical setup, ensuring you keep your vehicles running perfectly.
Frequently Asked Questions






My car was struggling to crank, but the second I hooked up the WontPrix, I got a clear reading. The battery internal resistance was extremely high, proving it needed a replacement. Saved me from being stranded on my way to work!

This load tester is incredibly durable and precise! I test various deep-cycle marine batteries and standard automotive ones, and it handles everything perfectly. The data recording feature is a great bonus.

I love that it has 8 language options and is so cost-effective. Navigating the cranking and charging tests is a breeze. Every DIY garage mechanic needs to keep one of these in their toolbox!
