LiPo Safety

[xviper]

Read post #7. IMHO the OP could not have been charging at 5C, due to the apparent total mah of the six 6S packs he was charging and the maximum output wattage of the charger he was using.

One can only make the assumption that he knows what he's talking about. If, in fact, he does NOT understand what he's talking about or was doing, then what else does he not understand about charging batteries that may have led to this "incident"?

[davecee]

The way this reads infers that you have charged mixed voltage batteries ( example - a 3S and a 4S) in parallel. Is this what you meant??

No. Even packs of the same nominal voltage, eg 6S, can have very different actual voltages. A fully charged 6s pack is 25.2 volts, a discharged 6S pack is 22.2 volts. The 3 volt difference is quite enough to cause a significant current flow from the higher voltage pack to the lower voltage pack. The current may be higher than the lower volt pack can safely accept. This is why it is important for all packs being parallel charged to be the same, eg 6S, and near the same state of charge.

I just did some quick and dirty figuring and connecting a good fully charged 6S pack in parallel with a good, discharged 6S pack could result in a possible current flow of as much as 60 amps (peak) delivered as charge current to the discharged pack for a short time as the packs equilibrate. The OP had six 6S packs in parallel. If one pack was significantly lower in voltage than the others, all the others would be pouring current into the lower voltage pack.