battery charger hissing sound?

[stoney16]

I just got two sony 18650vtc4 batteries. When I had one charging in my sigelei charger I noticed it was making a hissing noise. I took the battery out and it wasnt warm to touch. When I put my hand on the charger it was warm. Is this normal?

 

[Baditude]

I know nothing about sigelei chargers. Some chargers do produce a little warmth, but they should not get hot to touch, and I've never heard of a charger "hissing". If this is a new development, I'd stop using it and contact the vendor.

 

[Dampmaskin]

My guess is it's the PWM you're hearing. Whether that ought to be audible or not, you should probably ask Siglei (or your vendor) about. Personally I don't like my chargers hissing or squealing, even if they work as intended.

 

[cskent]

A couple of years ago I had a Trustfire 001 charger that would sometimes make a high pitched buzzing noise near the end of the charging cycle. Others had the same issue with that charger. It didn't seem to be a problem though.

 

[stoney16]

Thanks for the responses, I appreciate the feedback. I took it back to the vendor and they swapped it out. New one makes the noise intermittently, I'm assuming it's just a cheap charger. Looks like I'll buy a better charger