battery

• bat‧ter‧y plural batteries
• 1

  electricity

   [countable] an object that provides a supply of electricity for something such as a radio, car, or toy
• COLLOCATIONS 
• change the batteries (in something) (=put new batteries in something)
• charge/recharge a battery (=fill it with electricity again after it has been used)
• flat battery British English dead battery American English (=one that has no more electricity in it)
• rechargeable battery (=one that can be recharged and used again)
• car battery
• battery powered/operated
• battery compartment (=the place where the batteries go)
• battery charger (=a piece of equipment for charging batteries)
• You have to take the top off to change the batteries.
• When the red light comes on, you should recharge the battery .
• The car's got a flat battery.
•  a battery-operated hair dryer
• 2

   a battery of something

  a group of many things of the same type:
• a battery of medical tests
• 3

  farm

   [countable] British English a row of small cages in which chickens are kept, so that the farm can produce large numbers of eggs:
• battery hens
• ➔ free-range
• 4

  guns

   [countable] several large guns used together:
• an anti-aircraft battery
• 5

  crime

   [uncountable] law the crime of hitting someone:
• He was charged with assault and battery.
• ➔ assault and battery
• 6

   recharge your batteries

  informal to rest or relax in order to get back your energy:
• A week in the mountains should recharge my batteries.

Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.