Name: Topdon BT100
Brand: TOPDON
Price: 53.99 USD

A low-cost 12 V tester for a car owner who wants to check a battery, starter and alternator at home.

Price checked November 9, 2026. As an Amazon Associate we earn from qualifying purchases.

Pros

Tests the battery, starter and alternator from one small unit that fits a glove box
Powers from the battery under test, so there is nothing to charge first

Cons

How it scores

The rating comes from 5 measured or published factors, each scored 0-100 against fixed reference points for its type. How we rank explains each one.

Specifications

Testing
Model number	BT100
Type	Conductance (digital)
Battery voltages	12 V
System voltages	12 V
Rating range	100-2,000 CCA
Battery types	Flooded, AGM flat plate, AGM spiral, EFB, gel
Starter test	Yes
Charging system test	Yes
Ripple or diode test	Yes
Features
Stores results	No

A step up from the BT100 for anyone who also works on 24 V trucks or equipment, with a sunlight-readable color screen.

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Conductance (digital)100-2,000 CCA12 V