Foxwell BT705
A sturdy 12 V and 24 V tester with a cable long enough to run the starter test alone, and a longer warranty than most.
Amazon $106.99$106.99
The Foxwell BT705 is the better car battery tester overall, rated 3.6 to 3.5. The Foxwell BT705 leads on battery coverage. The Foxwell BT301 wins on price and features or load. The Foxwell BT301 costs $37 less ($69.99 vs $106.99).
Prices were last checked November 9, 2026. Product prices and availability are accurate as of that date and are subject to change; the price and availability shown on Amazon or the retailer's site at the time of purchase apply. As an Amazon Associate we earn from qualifying purchases.
Foxwell BT301
A simple 12 V tester for home garages, with a long cable for running the starter test without a helper.
Amazon $69.99$69.99
Which should you buy?
- Choose the Foxwell BT705 for battery coverage (up to 2,000 CCA, 24 V systems vs up to 2,000 CCA).
- Choose the Foxwell BT301 for price ($69.99 vs $106.99) and features or load (color or phone screen, cable of 5 ft or more vs cable of 5 ft or more).
Scores side by side
Each factor is scored 0-100 against the same fixed reference points for every digital testers car battery tester; a clear win is highlighted. How we rank explains each one.
| Factor weight | Foxwell BT705 | Foxwell BT301 |
|---|---|---|
| Overall rating | 3.6/5 | 3.5/5 |
| Price 25% | 67 $106.99 | 85 $69.99 |
| Battery coverage 25% | 80 up to 2,000 CCA, 24 V systems | 60 up to 2,000 CCA |
| System tests 20% | 80 tests the starter, charging system | 80 tests the starter, charging system |
| Features or load 20% | 10 cable of 5 ft or more | 25 color or phone screen, cable of 5 ft or more |
| Warranty 10% | 50 2-year warranty | 0 warranty not published, scored as none |
Specifications
| Foxwell BT705 | Foxwell BT301 | |
|---|---|---|
| Testing | ||
| Type | Conductance (digital) | Conductance (digital) |
| Battery voltages | 12/24 V | 12 V |
| System voltages | 12/24 V | 12 V |
| Rating range | 100-2,000 CCA | 100-2,000 CCA |
| Battery types | Flooded, AGM, gel, EFB | Flooded, AGM flat plate, AGM spiral, EFB, gel |
| Lithium batteries | No | No |
| Starter test | Yes | Yes |
| Charging system test | Yes | Yes |
| Features | ||
| Display | 2.8 in screen | 2.8 in color LCD |
| Cable length | 5.9 ft | 6.5 ft |
| Build | ||
| Warranty | 2 years | - |