Recently tested my battery charger just too see if it worked as I've not charged or used my battery yet and it worked fine woke up in the morning and it won't turn on any idea what's happened?as I'm from the UK but the plug was this shape I had too plug it into a travel adapter but that still works fine so I'm assuming it's a fuse in the charger pack I've brought a multimeter but never used on before how would I go about identifying the issue and resolving it and if it is the fuse what fuse do you think I need?