FOXWELL BT705 Battery Tester. 1 FOXWELL 12/24V CAR TRUCK 2 IN 1 BATTERY TESTER. FOXWELL 12V 24V 100-2000CCA Battery Tester Automotive Load Tester. Euipped in FOXWELL unique smart chip which makes BT-705 battery system analyzer provide a accurate testing result in just 3 seconds.