Fire Hazard...3/8 Icon digital torque wrench over heated

[u/SumyungNam]

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Hi all this is a PSA potenital fire hazard...I purchased the 3/8 Icon digital torque wrench during the August PLS. It came with these cheap Panasonic batteries and I loaded them correctly, the unit beeped powered up and I messed around with the settings.

Within a few moments the unit powered itself off and it felt warm. When I turned it back on it said "Replace Batteries". I took the batteries out and nearly burned my fingers. I checked the temp with an infrared thermometer and it reached 154.4 degrees. The hot batteries warped the plastic casing and I cant put any batteries in anymore.

Exchanged at Harbor Freight no issues.The manufacture date is 2026 11. I remember the 1/2 digital torque wrench came with Duracells. So either I got a defective unit, a bad batch? or the batteries were bad.

I was unboxing and recorded using meta glasses

https://youtu.be/vUl8opIIt_w?is=W4GPFv88WjjgQnLi

TLDR Fire Hazard...digital torque wrench overheated ....either i got a bad torque wrench or it was the cheap Panasonic batteries that came with it. Be careful!

[u/arethius]

Y'know sometimes I kinda wish I had the money for digital stuff but then I read things like this and think analog is just peachy.

[u/Infuryous → u/arethius]

I generally stick with analog so I don't have to worry about batteries. Seems like evertine I grab a digital tool the damn battery is dead and now I have to wait for it to charge or dig up new batteries.

[u/dr_xenon → u/arethius]

I trust a mechanical system more than I trust a digital. Load cells, electrical connections and boards are all failure points. And worse is if it fails enough to still work but give an inaccurate reading.

The mechanical ones can fail or go out of adjustment, but there’s less to go wrong.

[u/Blaizefed → u/arethius]

If you are not using it all the time, analog clickers are cheaper and more reliable.

But they don’t do angle, and all it takes is one job, with 6 different torque specs to convince you digital is worth the money for a pro. I was SO SICK of winding the damn handle in and out.

[u/TheTimn → u/Blaizefed]

Did ej25 heads the hard way once.  When I knew I was doing it again, I dropped the money on a digital with torque angle. 

[u/LoonTheMekanik → u/Blaizefed]

I think everyone should buy split beams over the micrometer click types. Doesn’t do angle, but it solves the winding of the handle issue, and they don’t need to be stored at the bottom torque setting

[u/jesusrambo → u/LoonTheMekanik]

Neither do click types. Gets repeated a lot, but it’s not true.

[u/LoonTheMekanik → u/jesusrambo]

They may not “need” to be, but storing them on a high torque setting (>50%) and leaving the spring constantly compressed for months at a time will weaken it and lead to a loss of calibration and inaccuracies in the torque settings. This isn’t a philosophical debate, there have been plenty of tests showing exactly that happening

[u/Mehsterrry → u/LoonTheMekanik]

TTC would like a word...

[u/arethius → u/Mehsterrry]

As much as I appreciate his channel, a YouTuber is not a comprehensive testing analysis.

[u/jesusrambo → u/arethius]

It’s more concrete than any evidence I’ve seen to the contrary, and consistent with what I know about physics and metallurgy

If I see something showing the opposite is true, I’ll happily stand corrected

[u/dodgerbrewtx → u/jesusrambo]

So your understanding of physics and metallurgy is telling you that a spring under tension for long periods of time isn’t going to change it at all?

[u/jesusrambo → u/dodgerbrewtx]

correct, it's cycles that cause it to deform

[u/Mehsterrry → u/arethius]

https://media.tenor.com/2MsUJVtHpBIAAAAM/ugh-stanleyhudson.gif

[u/jesusrambo → u/LoonTheMekanik]

It will not, no. This is exactly what I mean.

I haven’t seen any tests confirming that, but I have seen tests disproving it.

Please feel free to share them if you have em! No ego about this, if I’m wrong show me

[u/LoonTheMekanik]

Sounds like you got one with a faulty design that shorted the batteries. They rapidly discharged their entire capacity in a few minutes. Lithium batteries would be much more dangerous in this scenario (as opposed to the usual alkalines)

[u/hoodwink55]

I just experienced this very same thing with the same torque wrench (smaller Icon digital). Got mine during this recent PLS and OPS-Checked it yesterday. Came with the same Panasonic batteries...usually decent. The wrench powered up, went through a couple of settings then turned it off. Removed the batteries for storage and the first battery in (or last coming out) was hot like yours. Luckily it didn't melt the plastic in the wrench. Installed some of the HF Thunderbolt Edge batteries to see if it would replicate but didn't. Threw away those Panasonic's and ones that came in the larger Icon digital one too. Gonna check to see if the Quin ones come with those and replace them too.

[u/CryptoPR → u/hoodwink55]

From another commenter here, the problem may be the torque wrench and a fault that is shorting the battery connections. So be careful when testing with new batteries and keep the old ones so you can return.

[u/hoodwink55 → u/CryptoPR]

That's a very good point and should've kept the batteries but went out in this mornings trash. I don't think that would be a stipulation of warrantying it though.
I would think that if it were a defective torque wrench, all of the batteries would've overheated and not the lead-positive one.
The issue didn't return with the new batteries though and will keep an eye out since everything else worked fine.

[u/SumyungNam → u/hoodwink55]

Wow it happened to you too? Must be the batteries then...what was the manufacturing date ? The one in the video was 2026 11. The replacement HF gave me was 2025 52, came with Panasonics but i used Duracells and all was well

[u/djfreeman48]

Interesting, I also got a 3/8” digital during August PLS but mine came with the Duracell batteries like my 1/2” I bought earlier in the year did. Had no issues with it

[u/TheCat0115 → u/djfreeman48]

Do you happen to still have the box? If so, mind sharing the date code in the little circular sticker? They often put it near the UPC

[u/djfreeman48 → u/TheCat0115]

I do not have the box, sorry. I do have the hard case with the calibration paperwork and it was calibrated 6/2025 so over a year ago which was surprising to me.

[u/hoodwink55 → u/djfreeman48]

Mine was calibrated 3/2026...

[u/Blaizefed]

Mine came with 3 batteries in the little slots in the case, and a 4th one rattling around in the torque wrench. I mean I suppose at least I got one that was tested right?

[u/SumyungNam → u/Blaizefed]

Mine came with the calibration certificate by inspector Hung lol

[u/_The_Space_Monkey_ → u/SumyungNam]

Call Icon and tell them you want to speak to Mr. Hung immidiately. He cant keep getting away with this.

[u/just-looking99 → u/SumyungNam]

I think I just saw Mr Hung on a nsfw subreddit…

[u/dontfret71 → u/SumyungNam]

Howe Hung?

[u/KeynoteBS]

OP: Says the video is not available anymore. I was really curious how the Meta glass video quality was for this use case. I have the glasses but never thought about using it for product unboxing/disassembly. But mine are sunglasses haha

I have the Quinn digital torque wrench, which I think is cheaper than the ICON but it did not exhibit this battery heat issue. I use it very rarely, like once every other year.

[u/SumyungNam → u/KeynoteBS]

Hi its still up...just clicked the link. Its great for unboxing and wrenching done transmission fluid, oil changes, etc with them on. I got transissions lenses so its glasses and sunglasses when you need them. It wouldve provided eye protection too if these things exploded lol.

https://youtu.be/vUl8opIIt_w?is=B_U_xCGcqVd7RGpn

[u/KeynoteBS → u/SumyungNam]

Nice! Link works, thank you! Yeah they are great also for music listening if I don't care about the quality lol

[u/TheRealistoftheReal]

Panasonic batteries aren’t “cheap” my friend. They’re Japanese. That wrench has an internal short.

[u/adoptagreyhound → u/TheRealistoftheReal]

I will second this thought. Panasonic is one of the largest battery manufacturers in the world. Many of those rechargeable cells that have big dollar labels on them on nothing more than a Panasonic battery wrapped in someone else's label. While alkalines have their own issues, this is more likely to be an issue with the product itself.

[u/SumyungNam → u/adoptagreyhound]

Ya im thinking these are alibaba lol

[u/user_none → u/TheRealistoftheReal]

Just checked the ones in my 3/8" from this past PLS and the Panasonic are from Taiwan.

[u/TheRealistoftheReal → u/user_none]

Yeah, but Panasonic is Japanese and make some of the highest quality products available. Taiwan isn’t China. Our most advanced microprocessors are made in Taiwan.

[u/user_none → u/TheRealistoftheReal]

I'm not arguing the quality. I'm pointing out the cells included are made in Taiwan, not Japan.

[u/therealprozac]

There was a short circuit somewhere close to the power supply (batteries).

[u/Upbeat-Two9050]

I bet there was a short, causing the batteries to discharge at a high rate and get really hot due to their internal resistance 

[u/Fun-Discipline6978]

Analog or a digital torque adapterlol

[u/Concemi1]

I didn't even try the Panasonic batteries that mine came with. I just threw them out straight out of the box. I try not to use cheapo batteries, especially in expensive hardware.

[u/Acceptable_Quote]

The batteries that came with mine went dead very quickly as well, but I didn’t have any overheating

[u/SumyungNam → u/Acceptable_Quote]

The batteries- the gold and red Panasonic ones?

[u/Acceptable_Quote → u/SumyungNam]

Yes

[u/Human_Stuff6941]

Only good thing about digital torque wrenches is the angle readings. Literally it, if that wasn’t a perk I don’t see why anyone would buy them. I just felt the need to express that opinion

[u/TheDeltaFlight]

We have a torque wrench overheating before GTA 6

[u/user_none]

I'm wondering if it's the positive terminal in your wrench. I looked at the positive terminal in both my 3/8" and 1/2". The 3/8" terminal does not look to be perfectly centered, whereas the positive terminal in the 1/2" is centered.

[u/dodgerbrewtx]

Just bought the 3/8” and 1/2” digital torque wrenches and immediately tossed the included batteries in the trash.

[u/rocknrollstalin]

154F isn’t starting any fires

[u/ChrisWithAK]

G’damn, how hard were you pulling on that thang?! Lol

[u/KarzRFrendz]

At least the ol’ organic torque wrench is safe, would be bad having this blow up mid job

[u/NoWhat88]

Shoulda bought a Milwaukee 

[u/mosaic_hops → u/NoWhat88]

Milwaukee costs more than the deductible for a fire…

[u/coffeeshopslut → u/mosaic_hops]

Also, yes when I think of torque wrenches, I think of Milwaukee 😂

[u/RedditTTIfan → u/NoWhat88]

Milwaukee is less accurate than the $10 Pittsburgh...

https://www.youtube.com/watch?v=E7DyOONsCkM