One guided test for the battery and the alternator. The readings here are made up; in the app they come from your own multimeter over Bluetooth.
Phone simulation: Car battery test
SIMULATIONComing in an app update
09.41
BackCar testZT-5B
Volvo V60Flooded 12 V · battery at 8 °CEdit
11 · At restEngine off, rested · about 83 % charged12.46 VGOOD
22 · CrankingMust stay at or above 9.30 V at this temperature10.42 VOKKeep hands, leads and clothing away from the fan and belts. Clip the leads on before you start the engine; do not hold probes while cranking.Start stageSkip
33 · ChargingEngine at about 2000 rpm · usual 13.80–14.70 V14.21 VOK
44 · Charging with loads onHeadlights and blower on · usual 13.80–14.70 V13.96 VOK
55 · RippleMeter on AC V · under 0.05 V is fine0.031 V ACOK
Finish with what is measured
StagesCrankingZT-5B
Stage 2 of 5
Start the engine nowCrank for 10 seconds at most, with a pause between tries.
OK10.42 V
Steady voltage while cranking. Limit 9.30 V at 8 °C.
Indicative limit: treat it as a guide.
At rest 12.46 VLimit 9.30 Vstarter turningengine running
Each dot is one reading (about 3 per second)
Lowest on the meter (MIN), VRead it off the meter and type it hereVThe first short dip is faster than the app can read. The meter's own MIN key catches it; it is saved next to the result.
RedoNext: charging
StagesVolvo V60Done
BatteryGOOD
ChargingOK
The battery holds up under the starter. The alternator charges within the usual range.
At restGood from 12.40 V12.46 VGOOD
CrankingAt least 9.30 V at 8 °C · meter MIN 9.8 V10.42 VOK
ChargingUsual 13.80–14.70 V · loads off14.21 VOK
Charging with loads onUsual 13.80–14.70 V · loads on13.96 VOK
The test runs in five stages: the battery at rest, cranking, charging with the engine at about 2000 rpm, charging with the headlights and blower on, and ripple on the AC volts range. Each stage is checked against its own limit, and the summary says whether the battery and the charging are fine. You can share it as a PDF report.
Clip the leads on before you start the engine and keep hands and leads away from the fan and belts. At about three readings a second the app cannot catch the first short dip, so it asks for the meter's own MIN value. The cold-weather cranking limit is indicative. The car battery test is coming in an app update.
