Jump Starter Engine Coverage Comparator
Every jump starter's box has a huge "peak amps" number on it. What it doesn't have is a test standard behind that number — or, as it turns out, a number that reliably predicts what engine size the same brand says it can start. We fetched eight products across four brands' own current pages directly to see what each one actually claims.
The standardized number exists. None of these pages state it. Cold Cranking Amps
(CCA) is defined in testable terms by SAE J537: per Battery
University's own explainer, "a battery with a CCA reading of 500A can deliver 500A at -18°C
(0°F) for 30 seconds without dropping below 7.2 volts." Not one of the eight product pages checked
for this tool states a CCA figure anywhere. All eight state only "peak amps" — with no disclosed
test condition — next to a claimed maximum engine size. That claimed engine size, not the amp
number, is what this tool compares.
The same peak-amp number doesn't mean the same claim, even from one brand.
DBPOWER's own site currently sells two products that each state "3000A" in their own page title:
the Peak 3000A (18000mAh) claims "up to 8.0L
gas or 6.0L diesel," while the G16
(3000A/80.66Wh) claims "gas engines up to 10.0L or diesels engines up to 8.0L" — 2.0L apart on
both figures, same brand, same headline amp number. Schumacher's own site runs the opposite
problem: the 800 Peak Amp and
1200 Peak Amp models — 50% apart in the
number on the box — both state the identical "8.0L gas and 6.0L diesel engines."
What this does not do
- It does not test any jump starter itself. Every figure is each brand's own current page, read directly, not an independent bench test.
- It does not convert "peak amps" into anything — no source found states a formula linking peak amps to engine coverage, so none is invented here. The two columns are shown side by side because that is genuinely all any of these pages state.
- It covers eight specific products across four brands checked directly, not an exhaustive catalog of any brand's lineup, and not a claim that unlisted brands or models are worse.
- Cold temperature matters more than any of these numbers. CCA is specifically tested at -18°C because cranking gets harder in the cold; none of the eight pages checked state a temperature their engine-coverage claim was tested at, warm or cold.