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King Song Charger Getting Very Hot


dbfrese
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I was charging up my 14S to get it ready to commute to work tomorrow, and the charger seemed extraordinarily hot after about an hour of charging. I hadn't noticed it getting that hot during previous charges. The wheel had charged up to about 90%, which was enough, so I unplugged it.

How hot do your chargers get :furious: -- not a quick charger, but the standard charger that it comes with? Mine was hot enough that I couldn't hold it with a full grip around it for more than about four seconds. Wish I had an IR type thermometer to read it's temperature, but that's not in my toolbox (yet). :whistling:

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Chargers don't seem to be of the highest quality. I had a 2 amp charger with a fan that I used sometimes because it's light so easy to carry in a backpack. One day I plugged it in in a Starbucks and it started making smoke. 

Is your charger a fanless one? Is it the simple 2A black plastic "brick" that it seems like most wheels ship as standard equipment? I have 3 of those and none have failed, but I don't use them that often because I bought a 4A charger that I use with a Charge Doctor. 

If the wheel was really low on charge when you plugged in it might be normal to have it warm up a bit, I've even had the connector get a bit warm in that situation. When I use the fanless ones I put them tall end up on a hard surface (not a rug or sofa for example) but that's just me being paranoid, I don't recall them ever getting super hot.

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15 hours ago, dbfrese said:

I was charging up my 14S to get it ready to commute to work tomorrow, and the charger seemed extraordinarily hot after about an hour of charging. I hadn't noticed it getting that hot during previous charges. The wheel had charged up to about 90%, which was enough, so I unplugged it.

How hot do your chargers get :furious: -- not a quick charger, but the standard charger that it comes with? Mine was hot enough that I couldn't hold it with a full grip around it for more than about four seconds. Wish I had an IR type thermometer to read it's temperature, but that's not in my toolbox (yet). :whistling:

Harbor Freight has some decent prices, especially if you find a super coupon for it.  https://www.harborfreight.com/catalogsearch/result/index/?dir=asc&order=EAScore%2Cf%2CEAFeatured+Weight%2Cf%2CSale+Rank%2Cf&q=IR+thermometer

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My 14c charger gets warm, but my 16s charger gets as hot as you describe.  I DO have an IR thermometer gun, so next time I charge up, I'll zap it and see.

Personally, I see no reason not to drill small holes in my own personal charger (not a recommendation) for ventilation.  I can't remember the last time I threw a glass of water on a charger of any kind. Of course, avoiding the internal components with the drill bit might be troublesome.

Edited by Smoother
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1 hour ago, Smoother said:

Of course, avoiding the internal components with the drill bit might be troublesome.

With all of your spare parts lying around you must a disposable charger to experiment with. Take a reading with your IR gun before and after the ventilation. 

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8 hours ago, dmethvin said:

Is your charger a fanless one?

Yep. Just the standard cheap charger.

4 hours ago, steve454 said:

Harbor Freight has some decent prices,

I saw some on Amazon, too, for less than $20 by a brand that I've bought before with good luck. 

1 hour ago, Smoother said:

I'll zap it and see.

When I get mine, I'll post my temperature here after a good charge session.

1 hour ago, Smoother said:

I can't remember the last time I threw a glass of water on a charger of any kind. 

Hmm. I kinda like that idea for cooling it off. Maybe I'll get a metal pail of salty ice water and immerse the charger in it while I charge the wheel. :w00t2:

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  • 4 weeks later...

I have a FLIR thermal camera on my phone, but since it's been winter, no reason to charge up the wheel(s). Have to remember to take pictures of the charger once I do. Maybe just with single charger, I usually charge using two "cheapo plastic bricks" in parallel through a Charge Doctor V2.

200 Fahrenheit (about 93 degrees Celcius) does seem excessive, especially since it's the outer plastic chassis temperature, meaning that likely the internals are running even hotter. Then again, how much quality can you expect for the cheapos? ;)  Sounds like they're set up to run pretty close to their limits,  hope my house won't burn down...

Edited by esaj
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  • 4 weeks later...

The standard charger of my KS-16S gets about 55°C/131°F warm (battery charging level was approx. 70%), measured by a chinese IR Gun Thermometer. That value seems reasonable to me, because I still could hold the charger in my hands. 

Cheers, Borg 

Edited by Borg666
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20 minutes ago, Borg666 said:

55°C/131°F

Wow, that's significantly cooler than mine. Maybe a few more people can weigh in on their charger temps to get as good sampling of what "normal" is.

Edited by dbfrese
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22 hours ago, dbfrese said:

Wow, that's significantly cooler than mine. Maybe a few more people can weigh in on their charger temps to get as good sampling of what "normal" is.

i burned up my kingsong chargers trying to use them in parallel i guess with the charge doctor trying to get an 100% charge on my wheels so got another brick charger from china, and it charges the wheels the same, 90% for the ks18s and 92% for the ks16s so it wasn’t the chargers. i hang the brick so it has airflow and it’s about 145 degrees f.

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15 minutes ago, JLars said:

Hi. 

I just bought a new ks14s and my charger also gets insanely hot. Maby that’s just how this charger behaves. 

Yes, the chargers do get insanely hot. It's normal.

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4 hours ago, Marty Backe said:

Yes, the chargers do get insanely hot. It's normal.

I run mine with a little 8" fan blowing at them on a low setting just to help with cooling and avoiding electrical issues.

 

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On 5/8/2018 at 5:03 AM, novazeus said:

i burned up my kingsong chargers trying to use them in parallel i guess with the charge doctor trying to get an 100% charge on my wheels

The Charge Doctor is just a electricity meter and an off switch, it's not capable of increasing charger's properties.

I just had a conversation about the possible dangers of connecting two chargers to a Charge Doctor v2 Dual. He told me that as some wheels may give out the 67V in the charging socket, all chargers are required to withstand the voltage in their output. Which does make sense. He doesn't know of cases where Charge Doctor v2 Dual would have caused a charger to burn.

What was the situation when your chargers blew? How did you connect them up, were they plugged in the wall, etc?

Edited by mrelwood
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On 5/9/2018 at 10:42 PM, mrelwood said:

The Charge Doctor is just a electricity meter and an off switch, it's not capable of increasing charger's properties.

I just had a conversation about the possible dangers of connecting two chargers to a Charge Doctor v2 Dual. He told me that as some wheels may give out the 67V in the charging socket, all chargers are required to withstand the voltage in their output. Which does make sense. He doesn't know of cases where Charge Doctor v2 Dual would have caused a charger to burn.

What was the situation when your chargers blew? How did you connect them up, were they plugged in the wall, etc?

yeah it’s pretty simple connecting them. i plug the charging cord to the wheel first and then plug the chargers in the wall. it worked on the ks16s but when i tried to do the 18s everything looked fine but when i came back to check on them both chargers were doa. idk how to take one apart to see what broke. i don’t think they want them serviceable. i’d like to get a 5 amp charger from @Jason McNeil someday. a replacement charger as good as or better than the supplied kingsong charger is $20 off aliexpress so for grins i might order another one and see if i can use the charge doctor without smoking the chargers. i don’t remember how i set the chargedoctor ie amp cutoff or voltage cutoff.

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45 minutes ago, Circuitmage said:

Ok, so I measured mine.

Top hotspot: 165F

Bottom hotspot: 197F

 

depending on where the brick s set, that’s very possible. i try to hang the brick which keeps the temp about 146.

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3 minutes ago, Circuitmage said:

@novazeus The "hotspot" is very small, approx 1 sq. cm. on both sides of the brick. 

It goes down rapidly away from that spot. Using a laser IR thermometer, it was easy to scan the whole brick to find the hotspot.

yeah i guess they are designed that way but hanging them by the power cord so there's airflow all around seems to lower the temperature by 20 degrees. makes me feel better. having a fan on the battery packs while charging would probably be good too, i just don't know how i'd do that. 

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my japanese electronics engineer friend used to have a contraption set up for his batteries he was using in his rc planes using a computer fan and pvc tube. 

i have a giant fan but i'd need a huge diameter pvc tube.

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