What could, be the case, is that there are a LOT of fake duracell batteries around. I bought some batteries for my dive light in Egyptsome years ago, looked like Panasonic batteries, but was indeed Panasoanic !!
It became a night dive in tru words..
Fake Duracell battery alert
Consumers are advised to beware bargain Duracell batteries as inferior counterfeits are still being found on sale in the borough.
The nationwide problem has been ongoing for some years now and we have seized over 2,500 batteries from small independent shops and market stalls. The problem is often caused by retailers buying their stock from casual street hawkers with no paperwork.
Only four packs of AA and AAA size batteries are affected. The fakes perform very poorly and often leak, possibly ruining the products they are supposed to be powering and potentially causing acid burns to the skin.
The easiest way of checking what you have is to examine the cardboard outer packaging. On fakes the front and back are poorly stuck together and comes apart easily. Genuine products will have a grey/brown recyclable card construction whereas the fakes use white card.
Anyone who believes they may have bought counterfeit batteries should return them to the place where they bought them for a refund and to contact Trading Standards.
Retailers are advised to remove and re-cycle any counterfeits immediately as dealing in them is a serious offence under the Trade Marks Act. Battery re-cycling facilities are available at Manor Place depot. They are also advised to only buy stock from reputable established wholesalers as buying from other sources increases the chance that the goods sold will be fakes.
and from the Washington Post
"Counterfeits often have blurred or ripped labels; product names misspelled; contents, color, smell or packaging wrong. Trainer says he saw counterfeit Duracell batteries for sale at local supermarkets and drugstores recently. He turned the package over, he said, "and the word 'China' was misspelled.""