Battery Charger
Melting Slicks
Joined: Jan 2018
Posts: 2,817
Likes: 1,157
From: Wauconda Il
Try and do a search there should be some previous threads on this issue. Mine is usually really warm, but doesn’t get extremely hot. It may have something to do with how charged your battery is. Someone will chime in with some more in put.
Melting Slicks
Joined: Aug 2017
Posts: 2,194
Likes: 2,206
From: Massachusetts
I just checked mine that has been on the charger for days. It is cool\cold.
I do remember that once I used it to charge a dead battery and it did get hot.
Check your after a day, after the green light is ON.
I do remember that once I used it to charge a dead battery and it did get hot.
Check your after a day, after the green light is ON.
Melting Slicks
Joined: Jan 2018
Posts: 2,817
Likes: 1,157
From: Wauconda Il
Wow I’ve had my plugged in for 4 years whenever I’m not driving it and it’s never ever been cold. Warm is as coolest as mine as ever gotten.
Racer
Joined: Aug 2022
Posts: 411
Likes: 266
From: Northern Va
Generally speaking, chargers are not 100% efficient... The loss (or inefficiency) is typically given off as heat, and if the charger isn't actively charging the battery, it's reasonable that it would be cool!
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Race Director
Joined: Mar 2001
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From: Bonneville Salt Flats
These are "maintainers," not chargers. They will get hot if used on a very depleted battery; they are not intended for such use. If used as designed... to maintain a good, though charged battery, their sensation to the touch will vary from pretty warm (whatever that means--purely subjective) to cool. 
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When the GM charger is actually charging the battery, it can get anywhere from warm to relatively hot. I would not classify it as getting really hot.
Drifting
Joined: Jan 2014
Posts: 1,568
Likes: 594
From: Jefferson City Missouri
I have used the same type CTEK from GM on both my 13 GS and then on my 19 GS. Neither of them got to what I would consider hot. It is mounted on a concrete wall which would absorb most of the heat if it should ever get hot.
Cruising
Joined: May 2001
Posts: 13
Likes: 2
From: Myrtle Beach SC
Trying to decide whether to leave the charger plugged into the lighter socket in trunk all the time as I only drive the car in summer and not much than either, or put one of the disconnect green twist top units on it and not have to worry about battery drain. Don't really care about the loss of preset radio stations. Any other things I should know?
