Why are batteries useful?

Related questions

1. Why are AA batteries called AA?
2. Do batteries last longer in the freezer?
3. What are eneloop batteries?
4. What is the purpose of DNS AAAA record?
5. What are AAAA batteries used for?
6. What battery can replace lr1130?
7. What battery is the same as lr1130?
8. Are eneloop batteries any good?
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Tags

1. #chemicals
2. #important
3. #essentially
4. #other
5. #electronic
6. #devices
7. #battery
8. #components
9. #exist
10. #laptops
11. #players
12. #electrons
13. #produce
14. #batteries
15. #appliances
16. #electrical
17. #essential