What size are 18650 batteries?

Related questions

1. Can I charge a lithium battery with a normal charger?
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3. How many amps do I need to charge a 12 volt battery?
4. Can I use a 12 volt battery on a 6 volt system?
5. Can I charge a 6v battery with a 9v charger?
6. How many volts is a 123 battery?
7. Do you have to fully charge lithium ion batteries the first time?
8. What can you use 18650 batteries for?
9. Is frequent charging bad?
10. Are 18650 Batteries lithium ion?

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