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DieHard Platinum 6V/12V Battery Charger and Maintainer

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Description Specifications
DieHard 28.71239 Platinum 6V/12V Battery Charger and Maintainer Offers 3 Amp Charge
Whether used on cars, trucks, ATVs, boats, motorcycles or lawn mowers, the DieHard Platinum 6V/12V Battery Charger and Maintainer provides the needed charging supply. A digital display makes following instructions simple, while a microprocessor helps prevent overcharging. Float-Mode Monitoring keeps your battery at a normal voltage, maintaining the battery’s charge.
Built with safe operation in mind, the DieHard Platinum 6V/12V Battery Charger and Maintainer delivers reverse hook-up protection, shutting off the charger if the clamps are incorrectly hooked up to the battery. This portable charger offers multiple connector choices, including 50A clamps, a 12V accessory plug and ring connectors.

  • The DieHard Platinum 6V/12V Battery Charger and Maintainer saves you time and effort by automatically choosing the battery's voltage
  • Fully automated and prevents overcharging by switching to preservation mode when charging is complete
  • A digital display guides you through the charging process
  • A hook attachment enables you to suspend the unit safely out of a work zone
  • Compact and portable, this charger is offered in black or silver
This product comes with:
Owner's Manual (1)Product Warranty
California Residents: Proposition 65 Warning
Ratings & Reviews

Overall Rating:

(89 Ratings)
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Most Helpful Reviews:

By Tom.T
October 23rd, 2014
Nice little charger.

Led readout is easy to read and tells when the battery is charged and on auto maintaining the battery charge. I use it for my lawn tractor battery and it works very well.

11 found this review helpful
By Adam_not_happy
January 3rd, 2017
Chager did not show bad battery.

I was looking for a charger to keep my car battery charged though the winter. I came across this one and watched the video and thought it would be a nice one. Looked at the reviews and most of the reviews were good. So I thought I would give it a try. Once I got it and read through the manual I found out that the video is for a different charger. Diehard got me. I will take the reasonability that I did not read all info for the charger, but the video they have for this charger is very miss leading as it is for the higher end charger. So that is one of the reasons why I give it a 2. The other reason is that it says that it will tell you if your battery is bad. The unit that I got does not. My vehicle was dead it would not even unlock the doors. I Pulled out the battery and hooked it up the charger said everything was good and started changing two hours later the unit said that the battery was fully charged. I put it back in and nothing the car was still dead. Got new battery and my car started up just fine.

3 found this review helpful
Reviewers may have received a benefit, like a sweepstakes entry or rewards program points, in exchange for writing a review.
Those benefits were not conditioned on the positive or negative content of the review.

Battery Charger


Love this item. I use it to charge a battery that I use to power a slow cooker to keep chili warm for football tailgates. It works perfectly.

November 8th via
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Great Option


I already had the 6 amp, larger version of this unit & was very happy with it. I purchased two of these smaller 3 amp units & am just as pleased with them. When you first attach this charger to a battery it analyzes the state of charge of the battery in a % reading. It will also automatically go into a desulfation mode, if needed, to attempt to restore a bad battery. The box also contains a cord to permanently attach to a battery for a quick connect and a 12V plug to charge your car battery from the passenger compartment of a vehicle. Keep in mind though, at 3 amps it is primarily a maintainer charger but will charge large dead batteries if you are willing to wait.

July 21st via
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Great charger


July 19th via
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Do not recommend


Purchased this product on June 4, 2017 and the display only worked for a very short couple of days. This was in fact a waist of my money

July 16th via mobile
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Almost great. Problems with fully discharged battery.


Great little charger. 3 Amps is not much, but it has many nice features to offset that. You may want a bigger charger as well as this one.

The only problem I've had with mine, almost 2 years old now, is that when your 12V battery gets almost fully discharged, near 0V, and you try to charge it with this ... the charger thinks it is a 6V battery and takes it to 6V and that's it. There is no way to override this, it is too smart (but not really).

Great as a maintainer, analyzer, conditioner.

Good for slowly (the best, patient way to do it) bringing a slightly depleted battery back to full charge.

Fails when trying to bring a 12V battery back from full discharge.

So very good product. 4 stars. I bought an extra one and gave it to my parents.

March 15th via
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Piece of garbage


It says slow charger and means slow charger 3hrs from dead and not even a light works. Also, it can't read the difference between a 6v and 12v. It said fully charged at 6v but cars are typically 12v so of course it doesn't turn on. Piece of junk and waste of money!!!

January 17th via mobile
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Best charger


It detects 6v or 12v ... it analyzes the battery (including, detecting if the battery is bad) begins charging and displays the percent of charge. When battery is fully charged it goes into maintain mode and will not engage until it detects the battery needs a charge. Small portable and easy to use!

January 11th via mobile
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Easy to use


Got as a present used it on my old truck worked great

January 4th via
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