About This

Next-Gen Performance – Upgraded from the trusted BT100, the FOXWELL BT301 12V battery tester delivers stronger features and 99.9% accuracy. Whether it’s a freezing start or a pre-trip check, it finds hidden issues with your battery, starter, or alternator before they leave you stranded. A bright 2.8″ color screen and 6.5 ft cable make testing clear and convenient—inside or outside the vehicle. Not for Lithium/Li-ion or 8V batteries.
Comprehensive Cold-Proof Diagnostics – Instantly check SOH, SOC, CCA, cranking voltage & time, alternator output, and loaded/no-load voltage—even in freezing temps. Ideal for spotting weak batteries or confirming replacements. Works with flooded, AGM flat/spiral, EFB, and GEL types, making it a versatile AGM and marine battery analyzer for all climates.
Clear 2.8" Color Display – Bigger screen, clearer answers. Get bold “good or bad” results at a glance—even in dim garages. Simple menus make this 12volt auto battery tester beginner-friendly. With the 6.5 ft cable, you can test right from the driver’s seat—no helper needed.
Skip the Shop, Test at Home – Avoid shop visits and unexpected bills. For what new ones cost, this unit has already more than paid for itself. This 12v battery checker tester uses advanced conductivity to give quick, accurate results at home. Heavy-duty clip leads ensure solid connections for stable readings—whether the battery’s weak or strong.
For Pros & DIYers – Built for everyone: weekend DIYers, mechanics, and pros. Works on cars, SUVs, motorcycles, marine (boats), tractors, light trucks, and even electric mowers. Clip, read, and know your battery’s condition in seconds.
Auto Data Logging & Tracking – Keeps your last test results so you can spot changes over time. Just hit “View” menu of this automotive battery tester to review history—perfect for boats, stored vehicles, or pre-trip checks. Stay organized without extra effort.
Trusted FOXWELL Expertise – With 14+ years in automotive diagnostics and 9+ years of proven battery tester sales, FOXWELL is the trusted choice of mechanics and DIY users. Built on advanced R&D and real feedback, our tools are accurate, durable, and easy to use—backed by a reputation pros rely on.