FOXWELL BT705Plus Car & Truck Battery Tester 12V/24V – 2.8" Color LCD, 5.9 ft Cables, Fast Accurate Diagnostics

The FOXWELL BT705Plus is an all-in-one 12V/24V battery, cranking and alternator tester that delivers fast, accurate diagnostics for flooded, AGM, spiral and GEL lead-acid batteries.

Designed for professionals and DIYers alike, the BT705Plus combines a faster processor, refined algorithms and a high-contrast 2.8" color LCD to give trustworthy results up to 30% quicker than its predecessor. Use it to check state-of-health (SOH), state-of-charge (SOC), cranking performance, cold-start risks and charging ripple — all from long 5.9 ft cables so you can perform tests while seated in the cab. The unit supports 12V and 24V systems found on cars, trucks, RVs, boats and tractors, and it’s compatible with most lead-acid battery types (not for lithium batteries).

How does the BT705Plus identify a weak battery?

The BT705Plus measures SOH and SOC and runs a controlled load test to reveal internal weakness that simple voltage checks miss. Its upgraded processor and algorithms improve detection on low-voltage or nearly dead batteries, reducing false passes.

• SOH and SOC readouts show battery wear and charge level
• Load test simulates real-world starting demand to reveal capacity loss
• Accepts rated CCA input for accurate comparisons to manufacturer specs

Can this device diagnose alternator and charging problems?

Yes — the BT705Plus runs charging system tests and measures ripple to detect alternator faults and poor regulator performance. It reports charging voltage and ripple so you can spot erratic output that causes dim lights or battery drain.

• Charging voltage readout for steady output verification
• Charging ripple measurement to detect bad diodes or regulators
• Works in-vehicle with accessories off and ignition OFF for accurate results

How easy is it to use in a shop or on the roadside?

Very straightforward — the bright 2.8" color LCD shows five diagnostic indicators at a glance and the long 5.9 ft cables let one person perform tests from inside the vehicle. High-conductivity clamps ensure solid contact and reliable measurements with minimal setup.

• Large color display readable indoors or outdoors
• Extra-long cables let you sit in the driver’s seat to test cranking and charging
• Clear pass/fail-style indicators speed decision-making

What batteries and vehicles are supported?

The BT705Plus supports common lead-acid battery types for both 12V and 24V electrical systems — making it suitable for passenger cars, light and heavy trucks, RVs, marine craft and agricultural machines. It is not compatible with lithium battery chemistries.

• Compatible types: Flooded, AGM, Spiral, GEL (not lithium)
• Systems: 12V and 24V vehicles including cars, trucks, RVs, boats, tractors
• Requires entering the battery’s rated CCA from the battery label for load tests

Who this is for: The FOXWELL BT705Plus suits mechanics, fleet managers, roadside technicians and informed vehicle owners who need reliable, repeatable battery and charging diagnostics without carrying multiple meters. If you want faster, more accurate testing than a basic voltmeter and a compact, portable tool that handles both cranking and charging checks, the BT705Plus is designed to fit into shops, service vans and home garages. Always follow the device’s in-vehicle testing instructions: switch off accessories, set ignition to OFF, and close doors for accurate readings. The kit ships with the BT705Plus unit, storage box and accessories for repeat testing and tracking results in routine maintenance workflows.