replace Nissan key battery 5

https://foxtrot-wiki.win/index.php/Understanding_the_Immobilizer_Fault_Nissan_Warning:_What_the_Key_Symbol_Means

If your Nissan key fob is getting finicky, the battery is probably dying. Most models use a common CR2032 coin cell. You'll need a small flathead screwdriver to gently pop the key halves apart, being careful not to break the plastic clips. Just swap out the old battery for a fresh one, snap the casing back together, and your remote should work like new again. It takes about five minutes and saves a trip to the dealer.