I have the pages of the manual showing how to do the pin unlock in my phone, just in case I ever need to do it.
Fob battery can become depleted faster if the fob is left within range of the bike when not riding (believe it or not, some blokes leave their fob in the garage). This is because the bike is continually sending a signal asking if the fob is within range, so if fob is close it then receives this & transmits/replies "I'm here". This then is a continual transmission day & night from the fob, battery suffers.