Never use wireless mice.

Went through my placement games, yes yes, 5-5 going good, places me into silver 2 (one game screwed me so hard it dropped me from gold 5 elo to silver 3 elo and then i won the last two games). so i think, hey ill just play one more game for the start of my climbing journey. but one problem, once i get to champ select, my mouse decides to die haha and the worst part is no replacement batteries so i had to dodge.. that -3 lp strike on my account is gonna hurt. just gonna lose one game and drop to silver 3 or something. fuuuu!

unless you have a huge package of spare batteries, never play ranked with a wireless mouse. ive learnt my lesson..