Identify Battery Test Report Values, Ratings and Reported Assessments

A battery test report has four kinds of information, and reading it correctly means keeping them apart. Measured values are what the tester detected, such as voltage and a measured cranking rating. The selected rating is what someone entered before the test, usually copied from the battery label. Test context is the setup and conditions, such as rating standard, battery type, temperature and state of charge. The assessment is the tester's verdict. A selected rating is never a result. A rating standard such as CCA or EN tells you how a number is expressed. It is not a factor for converting one number into another. The assessment belongs to the tester or the shop that issued the report, so record it as their conclusion rather than as an independent diagnosis.

The four parts of a battery test report

Part	Typical examples	How to treat it
Measured values	Measured voltage (V); measured rating in the chosen standard's units	Record exactly as shown, with unit and standard
Selected or rated value	Rating entered from the battery label, e.g. a CCA figure	Record separately; it is an input, not a finding
Test context	Rating standard, battery type, application, post type, battery location, temperature, charge state, date and time	Record what is stated; mark anything missing as "not stated"
Assessment	The tester's decision or result label	Copy the wording verbatim and attribute it to the tester or issuer

Midtronics' instruction manual for its MDX-650P tester is a clear documented example of this structure. Its battery result labels separate the decision, the measured voltage, the measured rating and the selected rating. Before a test, the setup asks for battery location, post type, application, battery type and rating standard. That is one manufacturer's device family. Other testers and shop software may use different labels, layouts and wording, so read each report on its own terms.

How to recognize each item on the printout or screen

Measured voltage

Voltage is shown in volts (V) and is usually the only figure with that unit. It is a reading taken at the time of the test. Its meaning depends on context such as whether the battery had just been charged or the engine had recently run, so keep it next to any reported charge-state information.

Measured rating versus selected rating

These two are the easiest to confuse because they usually share the same unit, such as CCA. The selected or rated figure is the value the operator entered, normally matching the number printed on the battery label. The measured figure is the tester's own estimate from the test. Look for wording such as "measured," "tested" or "result" against wording such as "rated," "selected," "set" or "entered." If a report shows only one rating and does not say which kind it is, treat its status as unresolved rather than guessing.

Rating standard

The rating standard tells you the system the rating number is expressed in. The MDX-650P manual lists these standards, and it notes that not every standard is available for every application:

CCA – cold cranking amps, a cranking rating defined at low temperature
CA – cranking amps
MCA – marine cranking amps
JIS – Japanese Industrial Standard battery designation
EN – European Norm rating
DIN – German Institute for Standardization rating
SAE – Society of Automotive Engineers rating
IEC – International Electrotechnical Commission rating

Numbers in different standards cannot be compared directly, and the standard label does not tell you how to convert between them. A report showing a CCA figure and a battery label showing an EN figure are not a like-for-like pair. If the standard selected on the tester does not match the standard on the battery label, note the mismatch and ask the issuer which value was entered.

Assessment or decision

The assessment is usually a short label or phrase, often near the top of the result. The exact wording depends on the tester and its software. Copy it word for word rather than paraphrasing it into a stronger or weaker conclusion, and record who produced it, such as the tester model or the shop that ran the test.

Test context

Context fields explain the conditions behind the numbers. On the MDX-650P, these include where the battery was during the test (for example, in or out of the vehicle), its post type, its application and its battery type. The tester can be set to show temperature in Fahrenheit or Celsius and has a date and time setting. Test prompts can also ask for temperature and charge-state information. Two look-alikes are worth checking: a temperature without a stated unit, and a date whose format could be read either day-first or month-first.

Step by step: reading and recording a battery test report

You need the report itself, whether a printout, a screenshot or a shop PDF. If possible, also have the rating information from the battery label. On many vehicles the label is on the top or side of the battery case, but the battery location varies by vehicle. If you check the label under the hood, do so with the engine off, and do not touch, disconnect or lay tools across the terminals. Running the test itself should follow the tester manufacturer's instructions, or be left to a qualified technician.

1. Identify the report: note the issuer, date and time, the vehicle or battery identifier as written, and the tester model or software version if shown.
2. Find the assessment and copy its wording exactly into a field labelled as the issuer's or tester's assessment.
3. Record the measured voltage with its unit.
4. Record the measured rating with its unit and rating standard as a separate entry.
5. Record the selected or rated value as its own entry, labelled as an input.
6. Record the rating standard used for the test, and compare it with the standard printed on the battery label. Note any mismatch rather than converting.
7. Record the context fields that appear, such as battery location, post type, application, battery type, temperature with its unit, and charge state. Write "not stated" for anything absent rather than assuming a default setting.
8. List open questions for the issuer, such as a missing rating standard, an unlabelled rating, or a temperature with no unit.

Completion check: every number in your record has a unit, a standard where relevant, and a label saying whether it was measured or selected. The assessment appears only once, attributed to its source, and every gap is written down as a question rather than filled in.

Illustrative example (invented figures)

The figures below are made up to show how to organize a report. They say nothing about the condition of any real battery or whether it should be replaced.

Issuer / date:        [as printed]
Tester model:         [as printed, or "not stated"]
Selected rating:      600 CCA   (input from battery label)
Measured rating:      480 CCA   (tester result)
Measured voltage:     12.4 V    (tester result)
Rating standard:      CCA
Temperature:          not stated
Charge state:         not stated
Battery location:     not stated
Assessment:           "[exact wording]" - attributed to [issuer/tester]
Open questions:       temperature, charge state and battery location not reported

Keeping the 600 and the 480 as separate entries stops the entered label value from being mistaken for a test result. Leaving the assessment in quotes keeps the conclusion with the party who made it.

When to go back to the issuer

A report can only be read as far as its labels allow. If it leaves out the rating standard, does not say whether a rating was measured or selected, or omits the conditions behind the test, the numbers cannot be interpreted reliably. In that case, ask the shop or person who ran the test to confirm what was entered and how the battery was connected before you rely on the result for a replacement or warranty decision.