I connected the terminals to battery and blew the 80 amp battery fuse correct polarity. I own a 2015 honda crv.

Blown 60 Amp Battery Fuses Honda Tech Honda Forum Discussion
Blown battery fuse honda. Pulled the fuse out and checked it its blown. The battery doesnt look old at all. Jumped it and let it run turned off engine and it started ok but 3 hrs later it was dead again. If you really wanted to be smart you also would have used a memory saving device before swapping out the battery so the car radio settings are saved and your driving habits including engine parameters. So is it possible in your opinion that the tender went bad which in turn blew the fuse. As was mentioned do not try to by pass that fuse.
What is meant by fuse blown42 the internal fuse of the battery is no longer working theres no option to replace that hence the entire battery will need to be replaced. It is the main fuse for the vehicle. Checked battery voltage before fuse and get a 21v reading. I went to start car with new battery and car was totally dead. If it blew there is something very wrong. Where is the fuse located.
It was so i check the fuse in the original pigtail connection from the old tender 75 and it is blown. Aaa came out and jumped the battery and it started. Now with new tender battery is charging. Battery is 2 years old. Triple aaa said my main battery fuse was blown. There is also a small latch on either side of the fuse in the fuse box that you have to un click before swapping out the fuse depends on the modelmake of your car.
They said my existing battery tested lower than normal so i asked them to replace. My battery is three years old yesterday i went to start the car and it was dead. You want to test the line and see why it blew before you try to replace it. Btw have never replaced this fuse ever with 40000 plus on the clock. The next day the battery was dead. Replaced battery because i thought it wouldnt hold charge but sounds like it was being drained by a short.
I realize that since this fuse is blown the battery is not charging.