Used Battery

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An automotive battery is a rechargeable battery that supplies electric energy to an automobile. Traditionally, this is known as SLI, for starting, lighting, ignition, and its main purpose is to start the engine. Once the engine is running, power for the car is supplied by the alternator. Typically, starting discharges less than three per cent of the battery capacity. SLI batteries are designed to release a high burst of current, measured in amperes, and then be quickly recharged. They are not designed for deep discharge, and a full discharge can reduce the battery’s lifespan.

As well as starting the engine an SLI battery supplies the extra power necessary when the vehicle’s electrical requirements exceeds the supply from the charging system. It is also a stabilizer, evening out potentially-damaging voltage spikes. While the engine is running, most of the power is provided by the alternator, which includes a voltage regulator to keep the output between 13.5 and 14.5 V.

Howbeit, typical passenger vehicle and light truck alternators use Lundell or ‘claw-pole’ field construction. Modern vehicles now use the compact alternator layout, whereas larger vehicles may have salient pole alternators similar to larger machines.

Search for a junkyard that may have your Battery in stock! You can search in the USA by zip code for used auto salvage parts near you using our used parts request form.

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About Used Batterys

The battery starts the engine and buffers the electrical system, and a weak or dead one is the most common breakdown cause there is. A tested used battery with good remaining capacity can be a real budget option, but age and testing matter.

What a Battery Does

The battery stores electrical energy to crank the starter and run the electronics when the engine is off, then recharges from the alternator while driving. It also stabilizes the vehicle's voltage. Most are 12-volt lead-acid or AGM types, sized and rated by group size and cold cranking amps.

Signs Your Battery Is Failing

Slow cranking or clicking when starting
A battery that will not hold a charge overnight
Corroded terminals or a swollen case
A battery warning light or frequent jump starts

What to Check When Buying a Used Battery

Have the battery load-tested to confirm real capacity
Check the date code, batteries older than about four years are a gamble
Inspect for a swollen case, cracks, or leaking
Match the group size, terminal layout, and cold cranking amps

Common Applications

Every vehicle needs a battery, and they fail from age, heat, and deep discharges. A load-tested used battery with a recent date code can serve well, especially as a budget or temporary fix, but always test before trusting one.

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Frequently Asked Questions

Is a used car battery worth buying?

It can be, if it load-tests strong and is not too old. Check the date code and have it tested, a battery under three or four years old with good test results can give years of service for far less than new.

How do I read a battery date code?

Most batteries have a sticker or stamp with a letter for the month and a digit for the year, like C3 for March 2023. Some show the date plainly. Newer is better, since batteries age even sitting unused.

What do group size and CCA mean?

Group size is the physical size and terminal layout so it fits your tray and cables, and cold cranking amps is the starting power rating. Match both to your vehicle's requirement, especially CCA in cold climates.

Why does my new battery keep dying?

If a healthy battery keeps going flat, the alternator may not be charging, or something is draining it when parked. Test the charging system before blaming the battery, the alternator is often the real culprit.