Batteries don’t last an ext than 3 to four years and also less if your winter temps gain well below freezing for months ~ above end. Luckily an altering your battery is among the easier automobile repairs you can DIY with simply a small know-how and also a few tools.

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Tools you should replace auto battery, include:

Keep alive memory tool (KAM)Wrenches (13 or 10 mm room common)Wire brush & sandpaper

In this write-up you’ll discover what tools you have to successfully adjust a vehicle battery, how to avoid a usual costly mistake and also how to pond the totality procedure like a pro.

Tools You’ll Need

Changing the automobile battery isn’t a huge deal, however you will require a few tools to get the task done right. These devices aren’t expensive however a tool favor the KAM device plays a pivotal component in the process.

What’s a KAM tool?


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Fitting the battery, the terminals are linked to the wrong battery postFitting the battery, the is placed in it’s cradle back-waysJump-starting, the cables are mistakenly connected

1 Terminals fitted incorrectly

This happens as soon as the new battery is fitted, the fitter, pulls the battery cables come fit the wrong next of the battery. In most instances it isn’t possible to right the battery wires to the not correct battery post, together the battery cables are firmly secured to the chassis using clips and also aren’t long sufficient to stretch to the opposite side of the battery post.

The root of the trouble is an ext commonly led to by fitting the battery come the auto back-ways (see below).

2 Battery equipment back-ways

Your vehicle battery is details to your car, it has the correct power out put to crank over your motor. A larger engine will call for a bigger battery, no surprised there. However your auto battery is also configured to fit her cars wiring harness orientation.

A car battery come in countless different dimensions. For a automobile battery come fit your car it obviously demands to be the correct height, width and also length. Yet where the poles are positioned ~ above the battery are vital too.

For this reason auto batteries space coded, this identify the dimensions and also the location of and also polarity that the the battery posts. As soon as buying a brand-new battery the components store can accessibility all this details from through simply understanding your make and model.

Connecting the battery terminals back-ways is commonly linked with fitting a new battery. It happens this means because the owner was sold the wrong battery and would just fit in the vehicle one way or since the battery was fitted to the battery cradle back-ways.

And through back-ways, I mean the confident pole was inserted geographically nearby to wherein the an unfavorable pole should be and vise versa. This then allows the fitter v a stretch to ar the battery terminals on the not correct battery posts.

Here’s a few tips to assist avoid this situation developing.

It’s constantly a an excellent idea to take it a pic on her phone before dismantling the old battery, just as a referral for later.Check your battery codes, or measure the batteries and note the location and polarity of the posts.If you’re struggling to acquire the cable to with across, then stop and also check your battery article identification, you may be installation the write-ups back-waysThe black an adverse battery terminal is removed an initial and equipment last.Battery cables room usually color coded, Red cable positive and also black cable an unfavorable (ground).The confident cable connects to the starter motor and fuse box. The negative is bolted come chassis soil (frame that vehicle).

3 Jumper cable incorrectly fitted

Connecting the booster cables back-ways is totally understandable. You’re to run late, you’re in a flap it’s easy to acquire it wrong. Getting it wrong will certainly sometimes cause problems though.


Step One:

Using the snapshot above as a guide, put the jumper cables top top in succession 1, 2, 3, 4.

Step Two:

Start the donor vehicle and allow it idle because that a few minutes (helps charge your battery).

Step Three:

Start your car and leave the cables attached and also your auto idling because that a few minutes.

Step Four:

Now with your engine running, remove the cables in turning back order 4, 3, 2 and also 1.

If a clicking sound continues and the battery cables and jumper cables space making good contact, inspect out“Car won’t start click noise”.

What happens if girlfriend fit terminals back-ways?


Fitting the battery terminals back-ways usually causes the main fuse to blow. The key fuse is clear the biggest fuse in her car and it’s draft to defend the circuit native overload and also potential fire. So once a key fuse blows, you know something major has happened. Punch the key fuse will reason total strength loss.

Attempting to connect the battery booster cables causes a comparable but much much less serious condition. The symptoms commonly connected with this form event includes, strength in the system but engine won’t crank.

Energy is design to circulation through your cars circuits in one direction and some circuits space fitted through diodes to protect against directional flow. Connecting the battery in reverse may cause the energy to flow upstream i beg your pardon can cause control module damages and also fry the battery.

How to solve fitting the cables back-ways

Wear glasses and gloves and disconnect the battery immediately. If the battery is leaking and fizzing end use too much caution, leaving the battery linked risks fire.

Test your battery for damages by originally checking voltage. If it’s leak complimentary and at least 12.5 volts walk ahead and fit the correctly.

Attempt to begin your car, if you have no strength or the ignition lamp come on yet engine won’t crank, inspect your fuses.


Replacing a auto battery can be dangerous. A auto battery is filled through acid that produces perhaps explosive gases. A vent pipe is a common approach to venting the battery vapors away from potential ignition sources.

A faulty battery is the most risky, a damaged or leaking casing may cause uncontrolled gassing. An ignition source such as just attempting to boost start your automobile could cause the battery to explode.

As you can imagine one exploding vehicle battery could be damaging for those involved. Also a healthy and balanced battery vents perhaps explosive oxygen and also hydrogen.

Wear protective glasses and gloves and also avoid potential ignition resource when working about batteries.

Potential ignition sources include:

Boost beginning direct ~ above the battery terminalsShorting the batterySmoking near the batterySoldering near battery

If her battery is wet, it method it is leaking acid. Acid is nasty and burns like hell. Usage glasses, gloves and long sleeves, washing with numerous cold water if it it s okay on the skin.

Mix baking soda and also water, pour over spilled acid to neutralize. A leaking battery requirements to it is in disposed the safely, examine your neighborhood treatment facility. Be mindful, a leaking battery will burn plastic, carpet, fabric trim and also paint. Follow an easy precautions and also battery replacing is fairly safe.

Is it OK come Touch automobile Battery Terminals?

A regular auto battery terminal dead 12-15 volts and also are not dangerous come touch. Electric vehicle (EV) terminals but are no OK come touch. A Tesla for example runs around 400 volts and also voltage across the person body have to not exceed 100 volts.

Electric vehicle terminal however, are really well insulated and the insulation is significant by a shining color, typical colors include: orange; blue; yellow. Inadvertent call with an electrical vehicles battery or terminals isn’t possible, several covers and also safety shields have to be removed.

How To readjust Car Battery

This is a basic procedure and although the looks lengthy when written down, the shouldn’t take an ext than fifteen to twenty minute to execute. You’ll have actually no problem so long as you follow the steps.

Note: I may refer to the black battery cable together the “Negative” or the “Ground”.

You’ll need to use caution approximately leaking acid, it will burn the eyes and also skin and also anything else it touches. Batteries are heavy however usually have a advantageous carry handle, enabling the battery autumn risk damaging the brand-new unit.

Locating your battery in some cars may be a challenge, for this reason if yours is no under the hood, check your vehicle drivers manual or google your model. The usual places include, under the hood, in the trunk, under the behind seat, under the passenger seat.

If her battery is fitted within your vehicle it will be fitted through a vent tube, it’s crucial to refit the tube to the brand-new battery. If her battery is equipment under the hood, it most likely won’t have a vent tube.


Your battery may likewise have a battery sensor fitted on the an unfavorable terminal. When a sensor is fitted to her battery, it means the PCM (Power-train manage Module) employs a battery monitoring software.

Ideally the PCM have to be educated of a battery adjust but this does require a trip to the dealer. It is possible to password your very own battery and I’ve detailed the bidirectional tool right here on the Auto electric repair devices page.

Your car will quiet run, drive and also operate without coding the battery but be aware, not coding the brand-new battery come the auto risks overcharging the battery and shorting it’s working life.


Check the your new battery is identical, inspect the password or inspect the dimensions and also remember to check the pole location and also polarity.Clearly identify your optimistic and an unfavorable terminals. The confident battery cable operation from the red to add (+) sign on the battery come the starter motor and also fuse box. The an adverse battery cable operation from the black an adverse (-) authorize on the battery to the chassis ground.Take a picture of girlfriend old battery in place, just in instance you have to reference the later.

Step 2


Fit KAM to your cars diagnostic socket (under steering column) and also connect to outside battery or a 12 volt power suggest of another vehicle. Verify it’s providing power through checking integrated light.Turn all consumers off, lights, radio, heater etc.

Step 3


Use a wrench or socket set to remove the battery bracket. Her bracket may more than the top or at the base. Volvo are plainly concerned around battery movement, they equipment both…. Lucky me!

Step 4


Now remove the positive red cable, don’t allow the cable to remainder on or come in contact with chassis ground. Rest it ~ above or wrap that in a cloth and collection aside.

Step 6


Fit new battery and check battery poles space in the exactly location.Clean the red confident terminal prior to fitting and tightening.

Step 8


Fit battery bracket and also tighten.Fit vent pipe if applicable.Some copper grease top top the terminals helps avoid corrosion in the future.

Step 10

Remove the KAM.Start the engine and test drive.

Are Brand brand-new Batteries totally Charged?


New batteries room charged but depending on lengthy they space stored and the ambient temperatures they might not be totally charged. It’s not inexplicable for a new battery to need a small boost. However, there need to be many of life in the brand-new battery to begin your vehicle. A brief drive will certainly take care of the top up charging.

Ask the parts store attendant to inspect battery state the charge prior to buying, or ask the shop to charge the battery prior to pick-up.

Use a volt meter to inspect voltage and also charge battery if below 12.5 volts.

12.7 – 13.2 volts is 100% charged12.4 volts is 75% charged12.2 volts is 50% charged12.0 volts is 25% charged0 – 11.9 volts is Discharged (Flat)

Does A brand-new Battery need to Be Charged?

A brand-new battery usually doesn’t have to be charged before fitting unless listed below 12.4 volts. While a new battery need to be 100% charged, they regularly aren’t. Charging the battery for around hour through a traditional household type charger will certainly be enough to totally charge the battery.

Alternatively, the vehicles alternator is more than capable of charging the battery come 100% capacity with a quick drive of twenty minutes without heavy consumers such as lights, heater etc.

Do I must Drive automobile After changing Battery?

If your battery is charged above 12.5 volts, a drive cycle isn’t necessary. However, test driving ~ making any kind of repair is advisable. It’s better to find any kind of potential concerns now, there’s never a great time for a breakdown.

A 15-20 minute journey is long enough to carry the engine up-to operating temperature and also totally charge the battery.

What To execute After installing A brand-new Car Battery?

To get the finest out the a new car battery, it’s important to operation a few simple checks, particularly if you doubt an electrical concern such as a charging fault or parasitic draw.

After installing a brand-new car battery, run these an easy checks:

Check the battery cables are clean and also tight.Check the battery hold bracket secures the battery in placeCheck the hood stay and also hood clean the battery postsTest journey the auto for twenty minutesTest alternator is operation correctly, watch graphic below (if doubt a charging issue)Test for parasitic draw, view graphic below (if doubt a battery drain)

Will an Idling auto Charge The Battery?

Idling a automobile engine will charge the battery, but bringing the engine up-to 3000 rpm will boost the rate of charge. The finest option because that charging a battery is obviously a battery charger. Making use of the alternator come constantly charge a low battery emphasize the alternator and drive belt and also will lead to premature failure.

Taking the auto on a short drive is the next best option, a 15-20 minute drive with all consumers turned off is enough to charge the battery. If your battery fails to charge, you might have among three usual problems.

Faulty batteryFaulty alternatorParasitic battery drain

Can A car Battery Go bad In 2 Years?

It is feasible for a automobile battery to go negative in 2 years. Batteries don’t critical as lengthy as they once did. Replacing a battery after three to four years is rather common. However a car battery must without a doubt last longer than two years.

Common reasons auto batteries failure prematurely:

Discharge with non useOvercharging alternatorParasitic power drawFaulty battery

Discharge with non use

Car batteries just don’t choose being idle, they’re draft to it is in in a constant cycle that charge and also discharge. Permitting them to discharge fully can death them. Today’s cars have a constant want for power, more and an ext electrical materials cause huge demands on the battery.

Most automobile owners don’t understand their car is still making use of battery power even though it’s turned off. The manage modules (computers) need a little amount of power to store the stored data in your memory.

A an excellent battery is so essential on contemporary cars. It’s the reason many cars fail to start in the lengthy term airport automobile park. A healthy battery should have actually no trouble continuing to be charged because that a least a couple of month without a journey cycle. If your battery can’t keep over this time frame, check for a battery fault or a battery drain.

Overcharging alternator

An overcharging alternator will cause premature battery failure. A faulty alternator regulator may reason the alternator to overcharge the battery. This isn’t as common as as soon as it to be as many alternators room now managed by the engines regulate module, i m sorry is a ton an ext reliable.

If you doubt an overcharging condition, walk ahead a operation the test together per pic below. A reading over 14 volts v all consumer on, means the alternator is act it’s job. If however, the voltage is over 14.6 volts through all consumers off, doubt a fault.


Parasitic draw

A helminth power draw is a continuous drain top top the battery. The attract may be little or large, small is the more usual type. When a car is parked up because that a duration of numerous days without being started, even a little parasitic draw can flatten a battery.

Prolonged cycles the deep discharging may damages the battery. Today’s cars room packed with electrical consumers and also control modules every one of which space power hungry. As a an outcome parasitic draws room common.


Faulty battery

It is feasible for the battery to be faulty which is disappointing. But prior to condemning the battery, inspect your battery cables room in great shape. The terminals room clean and also tight. Loose, dirty, corroded or damaged cables will exhibit symptoms identical to a level battery.

If you have a volt meter, go ahead and check the battery voltage and run a crank test as per diagram below. If the checks the end OK, run a volt fall test as per below diagram.


You deserve to run the same test transparent the circuit to find a allude of high resistance.

Will A vehicle Battery Recharge If girlfriend Let it Sit?

A automobile battery may not recharge if fully discharged. A battery charger will not attempt to charge a battery if it can’t finding a voltage. The is possible to override the battery charger by connecting a good battery using booster cables. This fools the battery charger and also the charging procedure begins.

After an hour, the donor battery and booster cables may be removed and also the flat battery should continue to charge. To totally charge a level battery, be all set to wait several hours, depending upon the amp rating the the charger.

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Related Question

Does Revving Engine fee Battery? Revving the engine at 3000 rpm will boost the alternator output. Higher alternator output will certainly charge the battery in a much shorter amount of time.