They have not been so hot recently in our experience and we have used them only when necessary.
About a year ago we had to send some Panasonic AAA rechargables back becuse the whole batch leaked almost immediately. No problem. But late last year we bought some panasonic 9v rechargables and found they wouldn't fit the appliances we bought them for because they are bigger than ordinary batteries. We contacted them, told them the problem. They said send them back. we did and a weelk later we got them sent back to us because they didn't have the original packaging!!! We set off on a very strongly worded correspondence telling them what we thought of them and how we were going to get our costs back.
Truth was about a week later a smoke alarm battery failed and we discovered they did fit in the smoke alarms.
But the funny thing is this. Reading your posting I went to have a look at what those batteries were. I opened the drawer to discover that they are decomposing and begiining to leak. This should be fun.
As for your hijacked request for help. If you used a credit card copy the credit card company and 7dayshop. Tell the credit card company you won't pay. Don't be fobbed off with being made to fill in their silly forms. Just say you'll suspend using that credit card with the exact amount in dispute as the balance. You may be surprised at how quickly the matter gets sorted especially if you are haevy user of that card.