i just bought my first quadcopter (Syma X11) and some extra 200 mah batteries. I charged some using the USB port on my computer. My question is it okay to charge them with my IPhone 7 charger which is just a ac plug with a USB input? I would connect the battery to the charging cord that came with the quad and plug the USB end of the cable into the I Phone. I'm thinking the battery would charge faster but I don't want to damage the batteries. I just found this forum and hope to learn more here. Thanks!