battery backup
A battery installed in an electrical device to maintain power to the device during a…A battery installed in an electrical device to maintain power to the device during a power outage.
Meaning
1 senses(uncountable)A battery installed in an electrical device to maintain power to the device during a power outage.
Lessons for this word
1 lessons- A1Countable and uncountable nouns — Because it can be uncountable