I understand most if not all of your external portable chargers can not take a charge themselves and provide one at the same time. Is there any plan for products that can take an initial charge themselves an then convert into a Pass-through/standby state so a secondary or more could charge. This would be an excellent feature for groups traveling with limited resources, or to allow them to be left to charge while out for a day or two with an already charged device. Think large outings convention professionals, campers with small solar setups. It would be great to leave portable chargers in line to accept a charge once the one up stream is full.
Or how about a way to use my mobile to charge another?
I do not see this being a safe option unless using USB type C, with that being said it is possible if your device supports OTG.
Anker OTG? I’d buy one
This is not necessarily true. Some do, in particularly the newer PowerCore units I believe. Check with Anker Support for a definitive answer however.
I have both the newer models of PowerCore 26800, the + with Quick charge and the other new model with dual inputs w/o. Neither will.