Nice big charger
If the battery had any life in it before charger connected wrong way round it may have had enough juice to blow the fuse.
Which may have alerted your "friend" that something wrong.
I suspect that charger has quite a high value fuse so didn't blow.
If the battery had any life in it before charger connected wrong way round it may have had enough juice to blow the fuse.
Which may have alerted your "friend" that something wrong.
I suspect that charger has quite a high value fuse so didn't blow.