Foxwell BT301
A simple 12 V tester for home garages, with a long cable for running the starter test without a helper.
Amazon $56.99$56.99
The Foxwell BT301 and the Topdon BT100 are evenly matched, rated 3.6 and 3.6. The Foxwell BT301 leads on features or load. The Topdon BT100 wins on system tests. The Topdon BT100 costs $3 less ($53.99 vs $56.99).
Prices were last checked November 11, 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.
Topdon BT100
A low-cost 12 V tester for a car owner who wants to check a battery, starter and alternator at home.
Amazon $53.99$53.99
Which should you buy?
- Choose the Foxwell BT301 for features or load (color or phone screen, cable of 5 ft or more vs none of the listed features).
- Choose the Topdon BT100 for system tests (tests the starter, charging system, ripple or diode vs tests the starter, charging system).
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 BT301 | Topdon BT100 |
|---|---|---|
| Overall rating | 3.6/5 | 3.6/5 |
| Price 25% | 94 $56.99 | 97 $53.99 |
| Battery coverage 25% | 60 up to 2,000 CCA | 60 up to 2,000 CCA |
| System tests 20% | 80 tests the starter, charging system | 100 tests the starter, charging system, ripple or diode |
| Features or load 20% | 25 color or phone screen, cable of 5 ft or more | 0 none of the listed features |
| Warranty 10% | 0 warranty not published, scored as none | 0 warranty not published, scored as none |
Specifications
| Foxwell BT301 | Topdon BT100 | |
|---|---|---|
| Testing | ||
| Type | Conductance (digital) | Conductance (digital) |
| Battery voltages | 12 V | 12 V |
| System voltages | 12 V | 12 V |
| Rating range | 100-2,000 CCA | 100-2,000 CCA |
| Battery types | Flooded, AGM flat plate, AGM spiral, EFB, gel | Flooded, AGM flat plate, AGM spiral, EFB, gel |
| Lithium batteries | No | - |
| Starter test | Yes | Yes |
| Charging system test | Yes | Yes |
| Ripple or diode test | - | Yes |
| Features | ||
| Display | 2.8 in color LCD | - |
| Stores results | - | No |
| Cable length | 6.5 ft | - |