I'll bring a spare battery.
There is almost no reserve fund left.
noun, noun which may take the genitive case particle 'no'
Used for preparatory actions, preliminary steps, or things done in advance. Often appears in compounds like 予備知識 (prior knowledge) or 予備調査 (preliminary investigation).
You can enjoy it even without prior knowledge.
I will report the results of the preliminary investigation.
I kept a spare tire in the trunk.
I prepared some spare batteries in advance.
I set aside some cash as a reserve.
reserve personnel; reserve members; alternates
spare room