EcoFlow 1300 extended external battery options, or Hack

[PNK]

I’m awaiting the EcoFlow 1300, I’m a novice in all of this , understanding more as time goes on .. reason for my purchase of the EcoFlow 1300. My question is .... is there a hack to extend extra batteries for more running time and DO IT without actually opening up the EcoFlow? I know I’ve seen some other guy do it on YouTube , but he had to open case and install a xt60 connector ... to hook up to the external battery he made ... both were able to be charged thru the ecoflow .... so , if these units can be daisy chained for more hours of run time .. can’t you do do same thru the plug they use to daisy chain the ecoflows .. thanks ..