I do not know .. "Charging with this accessory does not support"

The device is a "simple" battery adapter. Without electronics. (Hence as low). That is when the batteries are too weak gets the iPhone is not enough tension and drive your dream says "Charging with this accessory is not supported".
-> This message is for this adapter quasi only the "batteries empty" message ...
More expensive adapter / battery pack have a turn electronics on board, which after reaching a minimum voltage the juice quite easily and no longer load. Then the iPhone reports the course not more than by the foregone charge icon.
For me, the adapter works perfectly for 1.5 years. I use it with Eneloop rechargeable batteries and it still loose enough to load the iPhone (4) once from completely empty to full.
Actually, it would be for me a 4 star, but as for me, the outer casing has been broken on the original version now, only three ...