Mouse info plz!

i got the g5 now but i think i gonna buy g7..
im not a mouse expert and to tired to find info on google

Logitech g7

what is the stick there just a memory stick ?
and how long it take to load 1 battery up ?
and how long can u play with 1 battery ?
whats better ? G5 or G7 ? teeeelllllll meeee!!!

thnx for info, no whine about my english !