I parallel charge my lipo batteries and from day one have used so called 'safe' parallel charge boards, the 'safe' aspect comes form the use of fuses on the main power rail, and resettable polyfuses on the balance circuit. They cost more, but my thinking is that should anything go wrong, i.e a short, the fuse will go hopefully saving batteries and charger.
Alas, quality control can undo all the good intentions of the design when one of the main power rail fuses has a solder bridge connecting both sides of the fuse together.
My guess is that with a 5000mAh 6S battery if I have a short the fuse and solder bridge will both go, but it's irritating to see that there has obviously been no testing or no visual inspection, and the product is being promoted as "safe"!
In future I think it would be prudent for me to test any charging boards as soon as I get them.