I have been fighting with intermittent charging on our iPads.
Tried several commercially available USB 6' extension cables to keep the iPads plugged in while we use the devices.
Because of the IR drop in the cables, the iPad charging circuit often rejected the incoming voltage levels and would disconnect the units from the chargers.
Out of frustration I made my own 6-foot extension cable with #18 AWG power wires.
Problem solved.
50 male connectors for $6.50
https://www.ebay.ca/itm/321580225851
50 female connectors for $6.12
