The Battery Ladder (TM) battery organizer conveniently holds your 9V batteries. Store up to 10 9V batteries in one holder. All 9V battery brands will fit easily. Storing in a cluttered bin results in over-using the batteries on the top of the pile till they wear out. The batteries on the bottom of the bin are never used and slowly lose their charge. However, the Battery Ladder (TM) conveniently cycles batteries. Put the newly recharged batteries in through the top and the oldest dispense from the bottom. Stack multiple Battery Ladder (TM) towers for extra tall and fun storage. Or easily mount on your workbench or wall using the hanger notch. Makes a great gift for dad!