Battery Testers: what Claude and GPT would buy
Two AI models chose on their own, with no web access. Nobody tested these products: this is what each one says, and how to check it.
They disagree: Claude chooses Foxwell and GPT chooses TOPDON
In Automotive, Claude and GPT choose the same brand in 60 of 112 categories.
Claude Opus 5.5 · October 27, 2026
Foxwell BT705
A conductance tester that handles flooded, AGM, EFB and gel batteries and also checks cranking and charging voltage, giving a quick and repeatable state-of-health result.
Not for: Shops needing printed reports and warranty test codes for battery returns.
GPT 6.1 Sol · November 10, 2026
TOPDON BT200
Tests battery health, cranking performance, and charging systems, with a color display and support for common automotive lead-acid battery types.
Not for: Lithium batteries or high-voltage EV traction batteries.
Claude also lists TOPDON among the brands that matter.
Which one fits you
professional shop and warranty testing
Midtronics MDX (line)
The professional standard for conductance testing, with results that battery makers accept.
Not for: Home users who test one or two cars a year.
traditional load test
Schumacher BT-100
A simple carbon-pile style load tester that puts a real load on the battery.
Not for: AGM and start-stop vehicles where you also want a state-of-health reading.
Check before you buy
Specifications · 4 items
- Voltage
- 12 V and 24 V
- CCA range
- 100-2000 CCA
- Display
- 2.8 in backlit LCD
- Tester cable
- 7.8 ft
Taken from the pages of Walmart and Foxwell on November 11, 2026, not checked.
Where to find Foxwell BT705
- eBay
- Foxwell
Also seen on Amazon.
Shops seen in search results on November 11, 2026. A shop missing here may sell it too. Nothing was checked by a person.
Brands that matter
- Midtronics: Pro conductance testers used by dealers and battery makers.
- Foxwell: Capable consumer-to-prosumer conductance testers.
- Topdon: Budget conductance testers for 12 V cars.
- Schumacher: Load testers and chargers.
- Solar (Clore Automotive): Shop-grade testers and load testers.
What to avoid
- Plain voltmeter-style testers that only show resting voltage
- Testers with no AGM setting if you drive a start-stop car
Questions
Conductance tester or load tester?
Conductance is faster, safer and works on AGM. A load tester confirms real cranking ability but needs a fully charged battery.