They are guaranteed to maintain their charge jusquen 2024 you will no doubt consume this pack by then, they are AA batteries (also called LR6) 1.5v which are the most widespread of the walking.
To: Duracell quality, guaranteed 10 years, price.
Cons: no technology Powercheck
Conclusion: missing only the Powercheck technology to pack for that it is perfect, it is very economical and you will return to the stack to 0.75 this quality product it is really very interesting, for my part I have a battery controller " SODIAL (TM) Digital Battery Tester for 9V 1.5V batteries and "economical and reliable that allows me to test my batteries occasionally.