Last up to 10 times longer duracell is the number 1 brand when it comes to producing long lasting batteries this pack gurantees hours upon hours of use for everyday items that need a consistent power supply and will last 10 times longer than other brand alternatives what is duralock while most batteries lose their power even when not in use duralock batteries dont duralock preserves power for up to 10 years in storage making sure you get the absolute most out of them