Best Battery Charger for Your Boxster

If you plan on ever parking your Boxster for more than 3 weeks, you will need the Best Battery Charger for your Porsche Boxster.

Maintaining proper voltage in the Porsche battery is the best thing you can do to maximize battery performance and extend the lifespan of the battery.

A major concern when parking, winterizing, or storing your Porsche Boxster is the draining of the car battery. The car battery will eventually die due to parasitic draining.

Porsche Battery Bosch AGM
Save Your Battery

Why You Need Best Battery Charger for your Porsche Boxster?

All things considered, Post-2001 Boxsters are not very user friendly if your battery dies. In fact, you cannot even get access to the battery unless you have a spare battery sitting around. Consequently, you need to prevent parasitic draining of your battery.

Sale
CTEK - 40-206 MXS 5.0 Fully Automatic 4.3 amp Battery Charger and Maintainer 12V (40-206)
1,694 Reviews
CTEK - 40-206 MXS 5.0 Fully Automatic 4.3 amp Battery Charger and Maintainer 12V (40-206)
  • Unique reconditioning mode, built-in temperature sensing capabilities
  • Completely sealed Unit, spark proof and reverse - polarity protected
  • Premium input and output cable with robust strain relief
  • 5 year warranty. Ideal for start-stop systems
Sale
CTEK (56-870) Comfort Indicator Cig Plug
222 Reviews
CTEK (56-870) Comfort Indicator Cig Plug
  • Battery is charged through the vehicles 12-volt socket
  • The comfort indicator shows how much power is left in the battery
  • Made of high-quality materials for long-lasting dependability
  • Compact to easily fit in your glove box or center console
CTEK (56-915) Black Bumper
  • Designed to protect both the charger and the paint
  • Made of high-quality silicon rubber
  • Fits MUS 4. 3, Lithium, MXS 5. 0, CT5 Time To Go and Powersport battery chargers.
  • Also available in Pink sold separately

NOTE: Accordingly, if you get the CTEK charger and wish to use your 12V auxiliary power adaptor (cigarette lighter) for charging, and also make sure to add the CTEK (56-870) Comfort Indicator Cig Plug adaptor.

Parasitic Battery Draining

A parasitic battery drain happens when an abnormal and continuous discharge of power occurs after having shut off the engine. This can happen in your Boxster in as little as 3 weeks. Porsche recommends charging your battery if you plan on not driving your Boxster for 6 weeks.

Battery charging
Automotive batteries lose their efficiency when not in use.
The charge available in your battery can be measured with a battery hydrometer.
We recommend that the battery voltage be tested by your authorized Porsche dealer who has the appropriate equipment.
If the car is not driven for prolonged periods, the battery must be charged at least every 6 weeks. A discharged battery allows rapid formation of sulfates, leading to premature deterioration of the
plates.

Porsche Boxster Owner’s Manual

The Cause of Parasitic Battery Draining:

  • Short circuit in your wiring
  • Incorrectly installed car power accessory (i.e. Radar Detector, Laser Jammer, etc.)
  • Defective alternator
  • Old battery or in poor condition
  • Corroded or loose battery cables
  • Extreme temperatures (over 100 degrees Fahrenheit) or cold (under 10 degrees Fahrenheit)
  • Excessive Short Drives
  • Human error (dome light or headlights left on, etc.)

In any event, failure to heed this warning will result in a dead battery.

Help I Have a Dead Battery!

Ultimately, when you have a dead battery, you need to open the front luggage compartment to gain access to the battery. This will be the process to jump-start your Boxster, but it will not be easy or straight forward. Thus the best process is the knowledge of the existence of this issue and the application of using a battery charger to prevent a dead battery from occurring.

Dead Battery and I Can’t Open Hood

Your Battery is located in the “frunk” (front luggage compartment.) In post 2001 Boxsters, if your battery becomes discharged, it will result in you not being able to access your front luggage compartment. Your key fob will not work, nor with the electric switches located inside the car.

As a result, a dead battery will prevent the front luggage compartment lid from opening to access your battery. That is without the aid of a donor battery!

How to Unlock the Hood with a Dead Battery

  1. Firstly, unlock the driver’s side door and open it.
  2. Secondly, remove the plastic cover from the fuse box (located in the driver-side footwell.
  3. Pull out positive terminal red terminal in the fuse box
    using the plastic yellow gripper.
  4. Use a jumper cable to connect the positive terminal in the fuse box to the positive terminal of the donor battery.
    Note: If the vehicle was locked, the alarm horn will sound when you connect the negative cable.
  5. Use the black jumper cable to connect to the negative terminal of the donor battery to the door frame ground (located on the door arrester.)
  6. Press button 2 on the remote control for approx. 2 seconds to unlock the luggage compartment lid. This will also switch the alarm system off.
  7. Disconnect the negative cable first, then the positive cable.
  8. Push positive terminal C into the fuse box and push on the plastic fuse box cover.

Critical Note: You cannot start the engine with this method, This process is for late 986 (post-2001) and 987/987.2 models. And, This entire process is located in the owner’s manual.

YOU NEVER WANT TO DO THIS

Watch 5-10 YouTube videos on these steps before attempting!

Preferred Method to Deal with Dead Battery

The preferred method to address your dead battery in your Boxster is to charge the battery overnight using the method below.

How to avoid a Dead Battery?

In summary, you have to connect the battery to a battery maintainer (not a trickle charger) to charge your battery. Porsche has made this easy via your 12V cigarette lighter located in the passenger footwell.

Use the Best Battery Charger for your Porsche Boxster

Porsche sells a Battery charger for this very purpose.

Preview
OEM Option
Porsche Battery Maintainer 958-044-901-71
Best Value
CTEK - 40-206 MXS 5.0 Fully Automatic 4.3 amp Battery Charger and Maintainer 12V (40-206)
Upgrade Option
CTEK (56-353) MULTI US 7002 12-Volt Battery Charger,Black
Title
Porsche Battery Maintainer 958-044-901-71
CTEK - 40-206 MXS 5.0 Fully Automatic 4.3 amp Battery Charger and Maintainer 12V (40-206)
CTEK (56-353) MULTI US 7002 12-Volt Battery Charger,Black
Customer Rating
Reviews
44 Reviews
1,694 Reviews
1,402 Reviews
Price
$208.00
$82.85
$118.16
Amazon Prime
Charging Current
5A max
4.3A
7.2A
Input Volts
110V
110V
110V
Output Volts
Nominal:12V
Nominal:12V
Nominal:12V
Cigarette Adapter Included
Y
N
N
AGM Battery Support
8 Step Charging Curve
Porsche CTEK Charger uses a 7 step Charging Program (no RECOND Stage)
Desulfation Cycle
Power Supply Mode
OEM Option
Preview
Porsche Battery Maintainer 958-044-901-71
Title
Porsche Battery Maintainer 958-044-901-71
Customer Rating
Reviews
44 Reviews
Price
$208.00
Amazon Prime
Charging Current
5A max
Input Volts
110V
Output Volts
Nominal:12V
Cigarette Adapter Included
Y
AGM Battery Support
8 Step Charging Curve
Porsche CTEK Charger uses a 7 step Charging Program (no RECOND Stage)
Desulfation Cycle
Power Supply Mode
Details
Best Value
Preview
CTEK - 40-206 MXS 5.0 Fully Automatic 4.3 amp Battery Charger and Maintainer 12V (40-206)
Title
CTEK - 40-206 MXS 5.0 Fully Automatic 4.3 amp Battery Charger and Maintainer 12V (40-206)
Customer Rating
Reviews
1,694 Reviews
Price
$82.85
Amazon Prime
Charging Current
4.3A
Input Volts
110V
Output Volts
Nominal:12V
Cigarette Adapter Included
N
AGM Battery Support
8 Step Charging Curve
Desulfation Cycle
Power Supply Mode
Details
Upgrade Option
Preview
CTEK (56-353) MULTI US 7002 12-Volt Battery Charger,Black
Title
CTEK (56-353) MULTI US 7002 12-Volt Battery Charger,Black
Customer Rating
Reviews
1,402 Reviews
Price
$118.16
Amazon Prime
Charging Current
7.2A
Input Volts
110V
Output Volts
Nominal:12V
Cigarette Adapter Included
N
AGM Battery Support
8 Step Charging Curve
Desulfation Cycle
Power Supply Mode
Details
Sale
CTEK (56-870) Comfort Indicator Cig Plug
222 Reviews
CTEK (56-870) Comfort Indicator Cig Plug
  • Battery is charged through the vehicles 12-volt socket
  • The comfort indicator shows how much power is left in the battery
  • Made of high-quality materials for long-lasting dependability
  • Compact to easily fit in your glove box or center console
  • Compatible with US 0. 8, MUS 3300, MUS 4. 3, MXS 5. 0, CT5 Time To Go & MUS 7002 battery chargers
  • The socket in the vehicle must be live when the ignition is in the “off” position to charge your battery using this accessory.
CTEK (56-304) Comfort Connect Extension Cable, 8.2 Feet
4,511 Reviews
CTEK (56-304) Comfort Connect Extension Cable, 8.2 Feet
  • Designed to help you reach your CTEK battery charger
  • High quality and easy to connect
  • Connections are weather proof
  • Designed to fit MULTI US 3300, MULTI US 7002, US 0.8, CT5 Powersport, MUS 4.3 Polar, MUS 4.3 Test & Charge, MXS 5.0, Lithium US, CT5 Time to Go and MURS 7.0, battery chargers.
  • 8. 2 feet long extension
CTEK (56-915) Black Bumper
  • Designed to protect both the charger and the paint
  • Made of high-quality silicon rubber
  • Fits MUS 4. 3, Lithium, MXS 5. 0, CT5 Time To Go and Powersport battery chargers.
  • Also available in Pink sold separately

NOTE: Accordingly, if you get the CTEK charger and wish to use your 12V auxiliary power adaptor (cigarette lighter) for charging, accordingly make sure to add the CTEK (56-870) Comfort Indicator Cig Plug  adaptor. And don’t forget the CTEK (56-304) Comfort Connect Extension Cable, 8.2 Feet !

What Battery Charger We Recommend and Why

We recommend that you purchase a Battery Charger that is both a smart charger and acts as a battery maintainer.

a) All Porsche need a battery charger, as do virtually all cars on the market.

b) You get a CTEK Battery Charger. This is the same battery smart charger that Porsche sells.

c) You get a CTEK charger that supports 8 step charging curve process. the 8 step charging curve will do a full maintenance on your battery. The CTEK has dedicated charging steps (desulfation, recondition, etc.) that maintain and increase your battery’s lifespan.

d) You get a CTEK that supports supply power. The supply power mode acts as a power supply for your car when you are swapping you battery. This maintains your ECU settings and even radio security codes.

e) AGM (Absorbent Glass Mat) battery support is now a required feature that all new CTEK chargers support.

Boxstertips recommends the CTEK (56-353) MULTI US 7002 12-Volt Battery Charger,Black  and that your get this product with both the CTEK (56-870) Comfort Indicator Cig Plug  adaptor and the CTEK (56-304) Comfort Connect Extension Cable, 8.2 Feet .

Where to Connect your Battery Charger

Generally, Automobiles have their 12V Power accessory outlet (cigarette lighter outlet) wired so that the 12V power adaptor outlets will only work when the automobiles are running, or when the key to start the car is inserted and turned to the ACC position.

The 12V power adaptor located in the center console is wired only to be active when the key is in the ignition (except on certain models of 986.) Therefore you need to use the other 12V power accessory adaptor when charging.

The Porsche Boxster Models 987/987.2/981 and 718 have a footwell 12V power accessory adaptor. The footwell 12V power accessory adapter is always on. As a result, when charging your battery during storage make sure to use the footwell 12V power adaptor outlet and not the unit located in the center console.

Boxster 986 European 12V Cigarette Lighter

On the Boxster 986, there are 3 different versions of the cigarette/power adaptor socket. The non-smoker’s package comes with a socket that is 1mm larger in diameter than a normal socket. If your center console is working with your CTEK with no key in the ignition, you are good to go!

UK Boxster 986s are strange. On some, the lighter is hot all the time and on others, it is not. We think it has to do with the year. The owner usually finds out when trying to use a charger that goes through the lighter, because it will not work unless the lighter is hot all the time.

Tool Pants@986forum.com

Trickle Chargers

The standard “dumb” trickle chargers provide an unregulated charge to your battery. Consequently If left not monitored, trickle chargers can boil a battery’s fluid dry. You need to purchase a smart charger with maintenance mode support.

Maintenance Mode

When you use the Porsche Battery Charger, select the pulse maintaining mode. Pulse maintaining mode charges the battery while storing your vehicle.

What is the Best Battery Charger for your Porsche Boxster

CTEK Multi US 7002 Smart Charger for your Battery

The new CTEK (56-353) MULTI US 7002 12-Volt Battery Charger,Black  or the CTEK - 40-206 MXS 5.0 Fully Automatic 4.3 amp Battery Charger and Maintainer 12V (40-206)  are highly recommended. Use the CTEK Multi US 3300 at a minimum (no longer being sold.)

Also, be sure to purchase the:

The CTEK charger is designed and engineered in Sweden. In fact, CTEK is the No. 1 car battery charger for OEM application.

CTEK 8 Step Charging Curve Process

Both the CTEK (56-353) MULTI US 7002 12-Volt Battery Charger,Black  and the CTEK - 40-206 MXS 5.0 Fully Automatic 4.3 amp Battery Charger and Maintainer 12V (40-206)  use an 8 step charging process. The 8 step work to ensure a thorough full charge of your battery including a full desulfation step.

What is the CTEK 8 Step Charging Curve Process?

This 8 step charging process makes the CTEK stand out among other smart battery charging solutions.

You want the CTEK 8-Step Charging Feature to increase your Battery’s Lifespan.

Step 1 Desulfation or Desulphation (UK)

Lead Sulfate crystals form in a battery and cause the untimely demise on 80% of all lead-acid car batteries. The CTEK detects sulfation in the battery and removes lead sulfate crystals that can form on the lead plates of the battery.

This patented desulfation step acts as a thorough cleaning of the interior lead plates of the battery and restores the battery to its original capacity and extends the life span of the battery.

Step 2 Soft Start

The Soft Start step offers severely discharged battery a smaller charge until the battery gets back up to about 10-20% of charge. This step acts as a test to ensure that the battery can accept and maintain a charge. The initial low charge prevent any damage that could be cause to a battery that has dissipated the majority of it’s capacity.

3 Bulk

Once testing has completed the CTEK proceeds with a full charge up to 80%. This happens at at a very high speed and efficient rate.

4 Absorption

This step charges the rest of the battery to the full 100% at declining current and can take up to 10 hours.

5 Analyse

The CTEK does a full analysis of the previous 4 steps to ensure that the fully charged battery maintains its charge. This test analysis takes approximately 3 minutes.

CTEK 8 Step Charging
CTEK 8 Step Charging Curve

6 Recondition

This is a battery reconditioning process (30 minutes to 4 hours) that mixes the battery acid. Tiny bubbles are formed and act to stir up the acid settled at the bottom of the battery. It results in remixing the acid and water into an efficient solution.

7 Float

Once the reconditioning step has completed, the voltage and the current will level off to maintain a floating charge of 13.6 volts and fully charge your battery to 100%.  The float charge will remain active for up to 10 days.

8 Pulse

Full maintenance step that keeps the battery at 95-100% capacity by monitoring the voltage and giving it a pulse recharge when the charge drops. This step is perfect for extended periods of time. The pulse step prevents your battery from overcharging. This eliminates the risk of your battery boiling over and drying out.

CTEK MULTI US 7002 Charger has SUPPLY Mode

The MULTI US 7002 is the ideal battery charger for your Porsche Boxster. The battery charger is well suited for all-year use. The SUPPLY mode of the battery charger provides power even without a battery.

The SUPPLY mode is indispensable when changing the battery and allows you to maintain battery voltages to your primary electronic components (mainly your ECU) . Doing this avoids losing all your complicated program settings of your ECU, Radio codes, etc.

NOTE: Using supply mode maintains power to your positive battery cable and as a result we recommend that you wrap both cables to prevent any shorting against your vehicles frames or other metal components.

CTEK Chargers

CTEK Multi US 3300 Charger similar to Porsche Charger

The look of this CTEK 3300 Multi US recommended charger should look similar to the Porsche OEM charger.

CTEK is the preferred battery charger, as a result, the most prestigious engineering car brands in the world have consequently adopted it.

In fact, CTEK chargers are selling as an OEM part in dealerships, such as Porsche, Audi, Lamborghini, Bentley Motors, Scania AB, BMW, Rolls-Royce Motor Cars, Chevrolet (Corvette), Ferrari, Alfa Romeo S.p.A., Maybach-Motorenbau GmbH, Aston Martin, Arctic Cat, Yamaha Motor Company, Maserati, Mercedes, and more worldwide.

CTEK MULTI US 3300 Battery Charger
CTEK MULTI US 3300 Battery Charger

In order to provide maximum battery charging performance, CTEK is constantly updating its technology. In fact, the Original Porsche Charger delivered 4A and now delivers 5A of service. The NEW CTEK Multi US 7200 offers up to 7.0 A of service.

Full Review of the CTEK MXS 5.0 Smart Charger for Your Porsche Boxster

Best Selling CTEK Chargers on Amazon

Top 10 Benefits of Using a CTEK Smarter Charger

TOP 10 CTEK Benefits
Click photo for link to the TOP 10 CTEK Benefits

Warnings About Battery Charging

Charging your car battery produces hydrogen gas. Hydrogen gas could cause an explosion, resulting in serious personal injury or death.

  • Always charge your battery in a well-ventilated area.
  • Never charge a frozen battery. It may explode because of gas trapped in the ice. Allow a frozen battery to thaw out first!
  • If you get electrolyte (battery acid) in your eyes, or on your skin, immediately rinse with cold water for several minutes and call a doctor.

From YouTube

Unboxing the CTEK MXS 5.0 Smart Charger

Unboxing of the CTEK MXS 5.0

Video on How to Use and Connect the CTEK MXS 5.0

How to connect and Operate the CTEK MXS 5.0
The CTEK MXS 5.0 Review of the 8 Stage Charging Cycle

About Your Boxster Battery

In the final analysis, Boxstertips recommends that you are using an AGM (absorbed glass mat) battery in your car. AGM batteries are maintenance-free, provide good electrical reliability, and are lighter than the flooded lead-acid type. AGM batteries stand up well to low temperatures and have a low self-discharge. The leading advantages are a charge that is up to five times faster than the flooded lead-acid version, and the ability to deep cycle. New CTEK battery chargers have a separate AGM battery support mode.

NOTE: Ultimately, the battery above an AGM battery, would be the Porsche Lithium-Ion Lightweight Battery starting at just over $5000 USD. Carbon Fibre case included!

Also be sure to check out our “Best Of” Series:

Other Articles of Interest

Battery Charger FAQ

How do I use my Porsche battery charger?

Porsche recommends to charge your battery when not using your car for periods longer than 6 weeks. Current model Porsche’s have 12V power adaptor(s) located in the cabin of the car that are hard-wired directly to the battery. Use your Porsche battery charger to use this (hard-wired) 12V power adaptor via the cigarette lighter connector.

Will a trickle charger recharge a dead battery?

Most Trickle charges run at a low power output level. Trickle chargers are not recommended because If a trickle charger is left not monitored, they can boil a battery’s fluid dry. A smart charger such at the Porsche/CTEK Charger 5A can restore a battery to full charge over time.

Is it safe to leave a trickle charger on all the time?

A standard trickle charger should not be left on all the time. If a trickle charger is left not monitored, they can boil a battery’s fluid dry. It is better to use a smart charger or a battery maintainer, therefore avoiding any possibility of incorrectly charging the battery and ensuring the battery is conditioned as well as charged, your batteries last significantly longer.

Can you leave a trickle charger on all winter?

It is not advisable to leave a standard trickle charger on all winter. If a trickle charger is left not monitored, they can boil a battery’s fluid dry. It is better to use a smart charger or a battery maintainer, therefore avoiding any possibility of incorrectly charging the battery and ensuring the battery is conditioned as well as charged, your batteries last significantly longer.

Will a car battery recharge if you let it sit?

No, a car battery will immediately start to dissipate it’s charge level. Car batteries cannot charge themselves. Only the car’s alternator or external charger can restore or maintain the correct charge level of your car battery.

Can you leave a CTEK charger on all the time?

Yes you can. The CTEK battery charger is a smart charger and features a computer programmed support mode to maintain and extend the lifespan of your battery. A CTEK charger can be left on indefinitely. Set it and forget it!

Last update on 2021-04-18 at 02:43 / Affiliate links / Images from Amazon Product Advertising API