The prior year models it looks like the fuse is easier to access.  So they definitely changed it for some reason.  Maybe people were putting larger fuses than they should I don't know.

I also noticed it appears on the Red Rover 5 that the battery and the charge portal on alternate side so the bike.

The charge port side could easily be redesigned by replacing the plastic cap with the port on the other side.

Wow that doesn't solve the fuse replaceability it would reduce user error some.

I don't know if tempting is the right word because I definitely let off a few cuss words after I did it the second time.

The key to unlock the battery from the frame and the charging port are probably an inch or two apart on the same side of the bike.  The prior model it looks like they were on alternate sides of the bike.

So if you're not really paying attention you just stick it in the slot and find out it was the wrong slot.

To limit this in the future, I've done two things.

One I leave the key in the bike because I don't leave my bike anywhere.  If I do, of course I'll remove the key.  At least I hope I will.

The second thing I've done is add red electrical tape above it to bring my attention to it and then after that I bought some yellow electric symbols from Amazon and put those around the charge port. 

Not the prettiest thing in the world but hopefully it will bring my attention to it being the charge for it and not put key in there.

First off a big thanks to Dick and Scott for your input.  Very helpful.

To anyone who's put the key into the charging port and feel stupid I feel doubly stupid cuz I've done it twice.  I've got some yellow electrical stickers and a big stop sticker to put next to the power socket now.  I will also be leaving the key in.  Seems like the key on the other side would have been a better idea.

First time I called Red power bikes was honest what happened they sent me a new charger to try and that didn't work then I never heard from them so I called back and they asked me to send pictures of the charger with and without the battery plugged in showing it was the battery and then they sent me a new one under warranty.  I did originally make them aware that it was my mistake.  Skip forward a few months and guess what I did again.  Not expecting them to cover it again I went ahead and ordered a new battery.  Gulp.  It hasn't shipped yet so I decided to do another search and ran across this thread.  First I tried just look cutting a slit but I put it in the wrong place and there's no fuse there so then I started opening up that end a little bit more found the fuse but for the life of me could not get it out.  So I decided to take the other end off and push it out a little bit couldn't get it to budge.  So I went back to town on the fuse with needle nose pliers again and finally got it.  Of course the two prongs pulled out of the plastic and were left behind.  I was able to get those out put a new fuse in and I just need to close up the patient.  Decided to confirm it was charging before reassembling everything and it was.

Scott you must be a laparoscopic surgeon because that seemed close to impossible getting out of that little slit you had.  I had pretty much the whole back end opened up and had trouble getting to it.

Tomorrow I plan on calling them and hopefully I can cancel the order before they ship the new battery.

So I had another confirmation it is possible.  I'm sure there was a reason to seal the fuse up but it having it accessible would have been so much easier.