About MiniMax

Smaller than a cell phone, MiniMax is a portable device that provides quick power on the go and can easily charges all your devices.

Battery dead? MiniMax’s lithium cobalt battery is even powerful enough to instantly jumpstart your car, truck, or boat! And unlike traditional jumper cables, MiniMax is safe for drivers of all ages, and even features a high-powered LED flashlight for seeing in the dark.

When you’re finished using MiniMax, its small size means it easily stores in your purse or glovebox. Taken together, this is why the manufacturer calls it “the most innovative portable charger ever made.”

Is MiniMax really anything special? Can you expect it to perform as well as the commercial makes it seem? Are there any other considerations you should know before buying it?

We’ve got answers to your most pressing questions about MiniMax. First, the competition.

Is MiniMax Portable Charger Really a Unique Product?

Unique? Not really. Part of a small (but expanding) group of products that can charge devices and jumpstart your car? Definitely.

Perhaps the best-known charging device/jump starter manufacturer is PowerAll, who makes devices very similar to MiniMax, as well as smaller versions and miscellaneous accessories. But there are also other popular brands, including Ivation, Jumpr, Matco Tools’ VersaPower Micro, Cobra JumPack, and more.

Pro tip: To see how many options you have, try typing the phrase “portable device and car charger” or “portable power bank jump car” into your favorite search engine.

The point? MiniMax’s manufacturer might want you to think this is something extraordinary, but it’s really just a slightly redesigned version of already existing chargers, which is a common theme among ASOTV products (more about this in the final section).

Next up, we’ll talk batteries.

MiniMax’s Lithium Cobalt Battery

As with the product itself, MiniMax’s manufacturer might want you to believe that their lithium cobalt battery is innovative. But the reality is that there are thousands of applications where these types of batteries are used (and have been for years), so it’s fairly commonplace, although the technology is still developing.

In fact, as Battery University notes, “Most lithium-ion batteries for portable applications are cobalt-based.” This is because they feature a high energy density, long run-time, and little power loss when not in use, which means they can provide hours of power for portable electronic devices.

However, lithium cobalt batteries do come with a couple big drawbacks. First, if lithium cobalt batteries are overloaded, they can actually become unsafe to use, since they contain pressurized, flammable material. Also, these types of batteries have a generally short lifespan of roughly 2-3 years.

Pros and cons aside, can the lithium cobalt battery in MiniMax really jumpstart your car?

Can MiniMax Actually Jump Start Your Car?

A jump starter’s power is often measured in cranking amps (CA) or cold cranking amps (CCA), which basically just references the amount of power released from the device into your car’s battery.

Most standalone jump starters (i.e. those that don’t also charge electronic devices), range from about 250 CA to 1,000+, while most power bank devices feature 300-600 CA (MiniMax is on the lower end of this spectrum, at 200).

Now, whether or not this would be enough to jumpstart your car depends on several factors, although the two most important are:

  1. The outside temperature (the lower the temperature, the more amps you’ll need), and
  2. The number of amps your battery requires in order to start.

Unless you’re starting a heavy-duty vehicle in sub-freezing temperatures though, the 200 cranking amps provided by MiniMax should be adequate in most circumstances.

Pro tip: Remember how we talked about the relatively short lifespan on lithium cobalt batteries above? Well, you won’t be able to continue jumping cars indefinitely, and you’ll likely only get 15-20 jumps before the device’s battery will no longer hold a charge.

Speaking of charge, how much does MiniMax cost?

MiniMax’s Price & Refund Policy

MiniMax is priced at five monthly payments of $19.95 plus free shipping, bringing your total to $99.75.

In addition to your MiniMax, you’ll also receive:

  • Multi-charger
  • Car charger
  • Carrying case w/jumper cables

All MiniMax portable chargers come with a 30-day refund policy, less S&H charges. In order to request one, you’ll need to call Big Boss’s customer service department at 877-206-6760.

Big Boss? Who is that?

Additional Info about MiniMax’s Manufacturer

MiniMax is manufactured by Big Boss, a division of Emson, Inc. (E Mishan & Sons), who also makes a variety of other products, including XHOSE, Big Boss Insta Mop, Car Cane, and more. What are consumers saying about these products?

Overall, these products had an average reader rating of 2 stars here on HighYa. Common complaints seemed to reference failure to work as advertised, poor quality, and difficult customer service (problems obtaining refunds, etc.).

From a company perspective, Emson had 75 closed complaints with the Better Business Bureau (as of 10/20/15), many of which referenced these same concerns.

Given all of this, should you spend your hard-earned money on MiniMax?

Will You be Shocked by MiniMax’s Portable Power Performance?

Here at HighYa, we sometimes feel that we sound like a broken record when reviewing As Seen on TV products. Why? Because they almost always come down to a question of value.

In other words, will MiniMax charge your portable devices and help jumpstart your car if necessary? Probably. Will it last for a long time and work as advertised? That remains to be seen.

But based on the manufacturer’s mixed online reputation—not to mention the fact that you’ll have to pay to ship it back to the company if you’re not happy—and that nearly identical products can be purchased locally for about the same price, we’d have to question MiniMax’s overall value.

Tip: Here’s some great feedback we received from a HighYa reader! While MiniMax might help start your car, your vehicle’s battery might not have enough power to continue operating the alternator—and consequently, the fuel pump—once MiniMax is removed. As a result, this could cause even more expensive repairs than just replacing your battery (they recommend doing so every 12 months).

Did you give MiniMax a try? We’d love to hear about your experience, so please consider leaving a review below!

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23 Customer Reviews for MiniMax

Average Customer Rating: 2.6
Rating Snapshot:
5 stars: 8 4 stars: 1 3 stars: 0 2 stars: 1 1 stars: 13
Bottom Line: 39% would recommend it to a friend
Showing 1-11 of 23
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  • MiniMax is a scam

    • Virginia,
    • Feb 22, 2017

    I recently purchased two MiniMax chargers (to give one to my son), but when I tried to jump-start my car, the MiniMax charger battery literally exploded.

    That's too dangerous for me to give to my son and the ad on TV doesn't go over all the bad details about what will happen if the unit fails. I am very disappointed with the false advertising of the product, and when I ordered it, it was on back order for a month.

    Bottom Line: No, I would not recommend this to a friend

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  • 1 out 1 people found this review helpful

    Started a dead 55 Chevy

    After using it at a cruise night to start a dead 55 Chevy, the whole car club went out and bought one.

    This is the perfect tool to keep in your glove box. I am into classic cars and go to cruise nights all the time in the summer. One night when getting ready to leave, one of the cars would not start. It was a bad battery, and before they could find jumper cables, I walked over with my mini max. After a few strange looks, I hooked it up, and the car started right away. Everybody was trying to see what I had, and after giving a good demo, most of the car club ordered one.

    So far everybody loves it for phones and cars. It is a great little invention.

    Bottom Line: Yes, I would recommend this to a friend

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  • 3 out 3 people found this review helpful

    Waste of money

    I bought the MiniMax several months ago, mostly for my riding lawnmower, which sits for short periods of time and sometimes needs a boost to start. The MiniMax has yet to provide enough "juice" to even think about starting the lawnmower. I tried starting a somewhat rundown battery on one of my cars and got nothing at all. I wouldn't even consider bringing this out on my boat with me.

    Don't waste your money. There are much better products out there, (which I'm presently researching). I'm giving it one star only because the flashlight works.

    Bottom Line: No, I would not recommend this to a friend

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  • 2 out 2 people found this review helpful

    Great charger

    • Cincinnati, OH,
    • Feb 3, 2017

    The MiniMax is awesome. I have used it on my car, and it was quick and easy. I love the size as it fits easily in my glove compartment. You can carry in your purse or jacket if you need to charge your other devices.

    I even used it on my friend's boat, which definitely saved our vacation!

    Do yourself a favor and get one! You won't be sorry.

    Bottom Line: Yes, I would recommend this to a friend

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  • 2 out 3 people found this review helpful

    Love it and always keep it with me. Have helped out myself and other friends.

    I loved the size and all it can do. I originally had it with me for keeping my technology charged, but recently have needed to not only get my car battery jumped, but two friends' cars as well. The product worked just like advertised.

    Bottom Line: Yes, I would recommend this to a friend

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  • 0 out 1 people found this review helpful

    Mine still works great

    I've had it for almost a year and am surprised to see negative reviews, although most people on HighYa are here for that reason.

    I've jump started my SUV a few times just fine and have used MiniMax a lot to charge my iPhone (it seems to charge it a little quicker than a normal USB wall charger).

    Bottom Line: Yes, I would recommend this to a friend

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  • 23 out 23 people found this review helpful

    Product does not work. Don't waste your money.

    I ordered one, but it would not even charge a cell phone. I then returned it, and they sent me two more, but neither one would charge a cell phone.

    I can't get a refund. This is a total scam, don't waste your money.

    Bottom Line: No, I would not recommend this to a friend

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  • 16 out 20 people found this review helpful

    It works

    • Illinois,
    • Dec 5, 2016

    I was working at a charity benefit on Thanksgiving night (2016). I had a couple come in and ask for a jump start as their vehicle was dead. The dome light was on very weak and the starter just clicked. I added this for clarity.

    A gentleman came up to us as we were situating the vehicles for the jump. He advised he purchased this small device online and several of us were skeptical, to say the least. The clamps were a little weak which caused us to have to hold them in place but as we were pondering the actual feasibility, the dome light instantly brightened, the driver turned the key and amazingly enough the car started.

    Needless to say, we were instantly sold. It works. OMG, it actually works.

    Bottom Line: Yes, I would recommend this to a friend

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  • 80 out 86 people found this review helpful

    What a waste of money

    I received the product and charged it overnight to a full charge as directed. Used it once to charge my mobile phone which took the Minimax down to half a charge. Tried to recharge the Minimax and now it will not fully recharge and only charges to four lights instead of five. I called all of the numbers found on the internet for customer service; #800-260-8178, #877-206-6760 and #877-539-9620. They were either wrong numbers and/or an automated pre-recorded message and none of them got me to customer service for the Minimax. Very frustrated with the product and a total waste of money.

    Bottom Line: No, I would not recommend this to a friend

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  • 108 out 115 people found this review helpful

    I Hate It

    I have had this for 3+ months now and have only used it to charge my phone while at work. Now when I charge it all the way up to 4 lights, as soon as I plug it into my phone it automatically goes down to 2 lights and takes forever to charge my phone up. This thing is worthless, don't buy it.

    Bottom Line: No, I would not recommend this to a friend

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  • 36 out 58 people found this review helpful

    Works great

    • Jackson, WY,
    • Aug 31, 2016

    I have a taxi company and I have to start my car a lot. Sometimes I leave the keys on and it runs the battery down. I've used the MiniMax twice and it started my vehicle each time. An awesome product!

    Bottom Line: Yes, I would recommend this to a friend

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