The TOPDON BT100 packs pro-level testing into a portable, straightforward design. With the ability to run battery, cranking, charging, and ripple tests, it delivers more versatility and insight than a basic voltage tester—allowing technicians and DIYers alike to diagnose issues with confidence.

Get an inside look at your battery’s health with clear readings of State of Health (SOH), State of Charge (SOC), and Internal Resistance. Results appear instantly on the display, while three easy-to-read LED lights—GOOD, CHARGE, or BAD—give you a quick visual status at a glance. No guesswork, just clear answers so you can act with confidence.

The BT100’s cranking test measures starting voltage and time, providing clear data on how the battery performs under starting stress. Quickly determine if the battery is delivering reliable power or showing signs of weakness.

Is it the battery or the alternator? The BT100 makes it clear. Its charging test analyzes ripple, loaded, and unloaded voltage, so you can instantly verify charging system performance and find the solution faster.

The BT100 tests all 12V lead-acid battery chemistries: regular flooded, AGM flat plate, AGM spiral, GEL, and EFB batteries. With a 100–2000A test range, it delivers accurate diagnostics across everything from compact cars to full-size trucks, making it a versatile tool for both professional shops and home garages.

Say goodbye to guesswork. The BT100’s 2-inch backlit LCD screen delivers accurate digital results you can easily read in bright daylight, low light, or anywhere in between—so you never have to squint or second-guess again.