Department: Technical Service & Installation

Policy Purpose: To guarantee that a replacement battery is the correct solution for the customer's vehicle. MobileBattery technicians are experts, not just parts swappers. We must definitively rule out alternator failure, starter issues, or simple parasitic drains before proceeding with an installation.

1. The Visual & Physical Inspection

Before attaching any testing equipment, technicians must perform a 60-second visual assessment of the battery and its environment. This applies equally to standard commuter cars, large RV banks, and enclosed scooter battery compartments.

• Corrosion Check: Inspect the positive and negative terminals for heavy acid buildup or white/blue corrosion, which can block the electrical connection and mimic a dead battery.

• Cable & Connection Integrity: Physically wiggle the terminal connectors. A loose ground wire or a frayed positive cable will prevent a vehicle from starting, even with a perfectly healthy battery.

• Casing Inspection: Look for physical damage to the battery casing, such as bulging, cracking, or active acid leaks. If the casing is compromised, the battery must be replaced immediately.

2. State of Charge & Load Testing

Every technician must use their approved digital battery tester/analyzer to determine the internal health of the battery.

• Resting Voltage: Measure the battery with the vehicle turned off. A healthy 12V AGM or standard lead-acid battery should read roughly 12.6 volts. Anything below 12.0 volts is severely discharged.

• Cold Cranking Amps (CCA) Test: Input the battery's rated CCA into your tester. The tester will apply a load to see how the battery performs under stress. If the measured CCA is significantly lower than the rated CCA (e.g., rated for 700, testing at 250), the battery has failed and must be replaced.

• The "Surface Charge" Warning: If the customer just had the vehicle jump-started and ran it for 5 minutes before you arrived, the battery may show a false high voltage. Turn on the headlights for 30 seconds to remove the surface charge before testing.

3. The Alternator & Charging System Test

A new battery will be dead by tomorrow if the vehicle's alternator is failing. You must verify the charging system is operational.

• The Jump-Start: If the battery is completely dead and will not start the vehicle, use your jump-pack to start the engine. (Note: A jump-start is a core service we provide; if this is all the customer needs, process it as a jump-start call and do not pressure a replacement).

• Measuring Output: With the engine running and all accessories (radio, AC, headlights) turned off, connect your multimeter to the battery terminals.

• The Universal Baseline: A healthy alternator should consistently output between 13.5 and 14.5 volts.

  - If it reads below 13.5V, the alternator is likely failing to charge the battery.

  - If it reads above 15.0V, the voltage regulator is likely overcharging and cooking the battery.

• Recommendation Protocol: If the alternator fails this test, inform the customer immediately. Advise them that while a new battery will get them on the road temporarily, they must drive directly to a mechanic to replace the alternator, or the new MobileBattery unit will be drained.

4. Starter Draw Test

If the battery tests perfectly healthy and the alternator is charging, but the vehicle still struggles to turn over or only "clicks," the starter may be the culprit.

• Testing the Draw: Use your battery analyzer to test the starter. If the starter pulls an unusually high amount of amperage or the voltage drops drastically when the key is turned, the starter mechanism is failing.

• Customer Communication: Explain clearly that their battery is in great shape, but they require a tow or a mobile mechanic who handles starter replacements.

5. Finalizing the Diagnosis

• Log the Results: If your digital tester prints a receipt or generates a digital code, keep this for your records or show it to the customer.

• The Handoff: Transition smoothly to the solution. "The test results show your alternator is working perfectly, but the battery's internal cells have degraded and it's failing the load test. We can go ahead and get that swapped out for you right now."