Originally Posted by gramey

6s lipo is presumably 6 cell which at 3.7 volts per cell equates to 22.2 volts, the 16018 is rated as per model number suggests at 18 volts so your running it over it's limit. I was going to go with the 16018 until I realised that it would restrict me 4/5s so I ordered the 16025.
This may not have been your problem but I wouldn't rule it out.