third-dimensional, three-d. Other synonyms: abstract, accessible, aesthetic, angular, apparent, artistic, asymmetrical,
If the battery is disposable, it will produce electricity until it runs out of reactants (same chemical potential on both electrodes). These batteries only work in one direction, transforming chemical energy to electrical energy. But in other types of batteries, the reaction can be reversed.
D-batteries are built for performance regardless of the type or chemistry, you just need to know which to use for what. All disposable D-batteries have long shelf-life (they hold a charge for a long time when not in use). Only the LSD NiMH has a comparable shelf-life among the rechargeable ones.