I purchased a carton of 24 AAA Duracell Quantum Hi Density Core and only had used 4 of them and needed to change batteries on a remote control at my house and after changing 3 or 4 different times all batteries were deffective. I had to go out and purchase more batteries as this were bad, I tried calling your 800 number today and after waiting 35 min, decided to write as no one answered the phone, Please contact me at (305) 864-****, Maria Notkin User's recommendation: Try to buy some other brand, the 10 year guarantee did not work.