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Customer reviews for STANLEY FATMAX 1200 Amp Jump Starter + 120 PSI Air Compressor & USB Power for
STANLEY FATMAX 1200 Amp Jump Starter + 120 PSI Air Compressor & USB Power
4.3 out of 5 stars
stars
321 ratings212 reviews
  1. 5 stars71% (228)
  2. 4 stars12% (38)
  3. 3 stars3% (11)
  4. 2 stars4% (12)
  5. 1 star10% (32)

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Showing 21-30 of 212 reviews
May 3, 2026
Reviewer name: anonymous
2 out of 5 stars
2 out of 5 stars review

not for large SUVs

It only charges a "Large SUV" once at full charge. Anything after that its only good for the lights and air pump. Learned the hard way, as Im use to my Noco giving a good number of jumps before dying. Not worth the time or money.

Helpful?2Y4T43AGN1F815188023565
reply from Stanley 12 Volt

This unit is designed to be used when fully charged. Under charging the unit will result in decreased performance. It is recommended to charge this unit every 30-90 days to make sure the unit is fully charged in case of emergency.

Aug 8, 2026
Reviewer name: anonymous
3 out of 5 stars
3 out of 5 stars review

Compressor issue

The auto shutoff on the compressor doesn't function properly, it get to 0.1 from set psi and the compressor continues to run and never shuts off and never reaches the psi

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Apr 15, 2026
Reviewer name: RDH2026
1 out of 5 stars
1 out of 5 stars review

Dumb change!

Latest model needs its own special power cord to recharge. Cannot simply plug in using a grounded cord like previous models. It’s ridiculous that I have to tie s baggie containing special cord to it so I have it when needed. Totally useless design change from older models.

Review from Stanley12volt.com
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Apr 5, 2026
Reviewer name: SARAHLYNN
5 out of 5 stars
5 out of 5 stars review

Reliable

I have used mine for 5 years now and it is still working great ! It has been used to jump car batteries ( too many times to count ) inflate my tires and even charge my phone ! Paid for itself a couple times over, worth having and would recommend this item.

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Apr 11, 2026
Reviewer name: Joyce
2 out of 5 stars
2 out of 5 stars review

We have an earlier version of this Stanley jump start / Compressor / USB power unit and have loved using it. We purchased this new one and have been very disappointed. It can be used much the same, but instead of recharging in 4-6 hours it takes 40. instead of pluging into the wall it has a tiny 9 volt external charger which gets so hot while charging you dont want to touch it. I will not wait for nearly 2 days to be able to use it after the battery is used up and the high temperature does not seem safe. We are returning it and will try to find another brand designed like our earlier Stanley.

Helpful?2Y4T43AGN1F815188023565
reply from Stanley 12 Volt

The charger included with this unit is not a 9 volt charger. You may be using the wrong charging adapter. If replacement accessories are required. Please contact Baccus Global Technical Support at 877.571.2391 or email at CustomerService@Baccusllc.com

May 5, 2026
Reviewer name: Tom
3 out of 5 stars
3 out of 5 stars review

Good but not compact

The unit works very well and is quite powerful, but I found it much heavier and more cumbersome than I expected. Based on the photos, I thought it would be more light and compact. It gets the job done, but I highly recommend checking the dimensions and weight before buying to ensure it fits your needs.

Helpful?2Y4T43AGN1F815188023565
reply from Stanley 12 Volt

We appreciate your interest in this model and are happy to hear of your satisfaction!

Feb 24, 2026
Reviewer name: SHANE
5 out of 5 stars
5 out of 5 stars review

the original from many years ago worked well, but the handle was spring loaded on the side and could be cumbersome, the next one had no handle but corner holes to pick it up with, the air hose on the last one was a pai. to re- pack i to the trap door, plus it has like the original an ac plug to attach a power cord to, this new one has correct the handle issue and the repacking of hose issue, plus even though people prefered the ac plug it had before, that caused the issue of not being able to charge it while on the road, so the new ac dc adapter that they use now was as I think a correction fpr that issue. so my opinion is this is the best version yet. am very pleased with it. right out of the box it jumped my fprd deisel truck and tooped off my cars tire, one reviewer said no place to store the ac dc adapter, wrong, it fits where the tire hose is. you're welcome

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Feb 3, 2026
Reviewer name: Del
2 out of 5 stars
2 out of 5 stars review

Not worth the money!

I've had this about 2 years now, and I have loved it until now, battery shows full charge, I go to pump up a tire and after 5 seconds battery is dead. Surprised, I plug it in and charge it. 45 minutes later it's charged, I hook it back up and runs 10 seconds, dead again. I test the battery and it shows 12.6V, so I guess something went wrong with the circuit board, I don't know. I searched for the circuit board and found it for about $45.00. The whole thing cost me $89.00. It should last longer than it did, I don't think it's a good value.

Helpful?2Y4T43AGN1F815188023565
reply from Stanley 12 Volt

Please charge your unit for the next 24 hours. It is recommended to charge this unit every 30-90 days to prevent the unit from discharging. If stored in a discharged state, this will reduce the life expectancy of the internal battery or can cause the battery to retain a surface voltage (which can cause the unit to read a false full charge). If further assistance is needed, please contact Baccus Global Technical Support at 877.571.2391 or email at CustomerService@Baccusllc.com

May 14, 2026
Reviewer name: GregoryC
5 out of 5 stars
5 out of 5 stars review

Verified Purchase

Great Find

Nice compact unit with plenty of power for jumps or tires.

Helpful?2Y4T43AGN1F815188023565
Mar 9, 2026
Reviewer name: Heather
4 out of 5 stars
4 out of 5 stars review

Verified Purchase

Inflater

Got this for my husband to use on the boat or for the truck.

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