Mobile battery replacement means a mechanic comes to your car, tests the battery and charging system, installs the correct new battery, and takes the old one away for recycling. On most cars it takes well under an hour. It's one of the quickest and most common mobile repairs, and it saves you a jump and a trip to the store.
Signs your battery is failing
- Slow cranking, especially on cold mornings
- Rapid clicking when you turn the key
- Dim headlights at idle
- The battery warning light
- Corrosion, swelling or a rotten-egg smell
- The battery is three to five years old or more
If the car keeps dying even with a newer battery, the alternator may be the real problem. See bad battery or bad alternator?
How a mobile battery replacement works
Test first.
A good mechanic checks resting voltage, does a load test and confirms the alternator is charging.
Match the battery
to your car's group size, cold-cranking amps and type (standard, EFB or AGM).
Protect your settings.
Some mechanics use a memory saver so you don't lose radio and seat presets.
Swap and clean.
Remove the old battery, clean the terminals and tray, install and secure the new one.
Register if needed.
Many newer cars with start-stop or smart charging need the new battery registered with the car's computer. A scan tool does it.
Recycle the old battery.
Lead-acid batteries are recyclable, and many states charge a core fee to encourage it.
What it costs
Broadly, a replacement runs about $120 to $350 installed for most cars. AGM batteries, batteries in the trunk or under a seat, and cars that need registration cost more. Get a written quote. Our mobile mechanic cost guide shows how fees work.
How long do car batteries last?
Typically three to five years. Heat is the big enemy: batteries in hot climates often fail sooner than ones in mild weather. Short trips and long periods parked also wear them down.
Make your new battery last
- Drive at least 20 to 30 minutes at a time now and then
- Keep the terminals clean and tight
- Use a battery maintainer if the car sits for weeks
- Get it tested before winter. Our winter car checklist includes it.
Jump or replace?
If the battery is young and something was left on, a jump may be all you need. Here's how to tell a jump from a new battery.
Frequently asked questions
Can I replace a car battery myself?
On many older cars, yes. On newer cars with battery registration, hidden batteries or lots of electronics, a mechanic avoids headaches.
Will I lose my radio presets?
Possibly. A memory saver during the swap prevents it.
Do mobile mechanics bring the battery?
Yes, the right battery for your car, usually with a warranty from the battery maker.
Get a new battery today
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