Hi: I tried charging my fairly new 6s Sky Lipo battery today and everything was going fine,then after about 1/2 hour,I checked and the display was blank and the unit was a little warm,with a faint burnt electrical smell when putting nose to the fan hole. Charging at 3.5 amps. Used it yesterday to put a storage charge on this batt with no probs! Maybe used this charger 10 times total!
Any internal fuse,or is it junk?! Should I try another AC680,or something else?
All cells on batt are 4.12 or 4.13.
Looks like I need to spend a few more bucks and get a real charger.
(Update) .I decided to buy another AC680 and guess what.....that one committed suicide just like the first.....never thought I would get another "lemon" a year after the first one! No more for me!
Gonna buy a 13.8 volt power supply,as they both still work on d.c. power!Thanks Huck50

If you know your way around electronics, take a look at the internal power supply. These usually blow the primary SMPS capacitors.

Thanks,but I don't! I will probably just toss it and get something better! Huck50

I can try plugging into my car battery to see if in fact the power supply is done,so I guess it should work on d.c. power,if in fact the a.c. power supply is toast.This won't pop the car's main fuse or anything,if in fact there is something internal is burnt that will effect the d.c. side of things?! Thanks,Huck50

The charger input wires going to the car battery will get pretty warm before you damage a car battery. If you feel the wires getting warm, pull it. Leave the car off, connect directly to the battery.

It works,or at least it powers up. I never tried a battery with it,so I am assuming it will operate normally,so I guess it's not totally junk!!
Dum question, but will the battery have enough juice to supply the charger while charging with the car not running,or do I need to start the motor,
( I hope not!!?) I will try and finish charging my battery tomorrow. I like this charger so much,I bought another one without even trying the d.c. leads. Thanks,Huck50

Yes and no. Unless you are charging a ridiculously large battery, the car battery will easily provide enough power to charge a battery, a few probably, without running the car.

But, modern car batteries really don’t like being ran down low very much, it really impacts their life. They use thinner plates to get more starting current than they used too. At the least be sure to start the car occasionally, let it run for a bit. Safer to unhook the charger before starting (even though I'm guilty of not with no ill effects). And be aware the battery probably won’t last as long, pay attention to how well it starts, try to catch it before you get stranded!

Better solution, pick up a deep cycle / marine battery and use that.

Thanks,but this powering from my car battery is only going to be done as an "emergency",as now,just to finish charging what the a.c. power started before it died,then maybe to put a storage back on,maybe to do maybe one or more charges/storage till the new 680 come in.
I rely mainly on a.c. power. At least I can still use this charger! Thanks,Huck50.

I finished charging my 6s for maybe 20 minutes connected to my car battery and everything worked great and the car even started afterwards! New AC680 on it's way and now I have a cheap back-up....if the new one goes, I am NOT getting another one,gonna spend a few bucks more and get maybe a Hyperion or some other top tier charger! Huck50

I have never had any issues with my Sky Charger B6AC. It even has a temperature sensor that will automatically shut down the charger if a certain temperature is hit.

The internal power supply in the ac680 is very bad and weak mine went out and I bought and external power supply and it works better. I ended getting a Protek R/C 10amp 130w external

Thanks,but could you explain more why "it works better"?...faster charging,storage? Thanks,Huck50

I just received my new Thunder AC680 charger to replace my original AC680 which blew the a.c. power supply one week ago and guess what???.....after running for about 50 minutes this new 680 went POOF and just died just like the first one! Still works on my car battery,so I will be buying a power supply to run them both for now.
I would not normally go "cheap",but there seemed to be a lot of people using this charger,so I went ahead and bought two,but I learnt my lesson the hard way!
Maybe they(two AC680's) had trouble charging my 6s lipo,but only charging at 4.0 amps!? Huck50

Wow, bummer. Even with what appears to be moderate charge amps the power supply was running at full power because of the 6S voltage.

Since you’re charging 6S, suggest looking for a power supply with a higher voltage. Believe that charger is rated for 11~18 DC volts. A 15~18V supply would be better than a 12V job. The input current wouldn’t be as high, and the voltage converter in the charger wouldn’t have to work as hard.

I’d also suggest getting a supply with at least ~270 watts of power, or a little more even, to run both chargers. Leaves enough power to account for the power the chargers themselves consume (efficiency) and some headroom for supply reliability. Perhaps even more if you think you might upgrade to more powerful chargers at some point, as you’ve discovered 6S can take some power.

Thanks! I won't be using both AC680 chargers together.I already bought this power supply,not here yet: http://www.rctoys.com/rc-toys-and-pa...POWER.html.... will it be sufficient enough,as I will only be charging at 4.0 amps max? Thanks,Huck50