wherein the first fixing position, the second fixing position, and the third fixing position are positions at which the one of battery charging {HEAD ~ plug connectors} fixed to {TAIL ~ the battery charging cover} or the expansion battery charging cover is insertable into the one of battery charging slots of portable information terminals 
fixed to
wherein the first fixing position , the second fixing position , and the third fixing position are positions at which the one of battery charging { HEAD ~ plug connectors } fixed to { TAIL ~ the battery charging cover } or the expansion battery charging cover is insertable into the one of battery charging slots of portable information terminals
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH