VDIAGTOOL BT300 12V 6V Battery Tester 5-3000 CCA

Compact Diagnostic Tool for 6V

The VDIAGTOOL BT300 is a handheld battery tester designed for 6V and 12V lead-acid batteries including AGM, GEL and VRLA types. It covers a testing range from 5 to 3000 CCA and draws power directly from the battery under test, so no separate charging is required. The unit suits DIY owners and professional technicians who need a quick health check on cars, motorcycles, trucks, SUVs, boats or ATVs. It is not intended for lithium chemistries or golf-cart deep-cycle batteries.

Plug-and-Play Operation With Adjustable CCA Settings

Connect the clamps to the battery terminals and the tester powers up instantly, leaving both hands free for the display. Selectable CCA increments of ±5 or ±50 let you match the test parameter to the battery label for tighter accuracy. The compact housing measures 6.45 by 3.35 by 0.96 inches and weighs 0.43 kilograms, so it fits in a glovebox or tool pouch without crowding other gear. No external cables, adapters or software installation are needed.

Sustained Load Analysis Across Multiple Parameters

Under continuous load the BT300 reports voltage, internal resistance, ripple, state of charge, state of health, CCA value, plus cranking and charging system performance in a single session. The algorithm maintains the load long enough to stabilise readings rather than capturing a momentary spike, giving a clearer picture of real-world starting capability. Regular use tracks degradation trends so ageing cells can be replaced before they fail in cold conditions.