Charging Camera Batteries Nikon Charger For The En-el9 How Do You Charge A Nikon Camera Without The Charger?

How do you charge a Nikon camera without the charger? - charging camera batteries nikon charger for the en-el9

I have a Nikon Coolpix
and the lithium battery is 3.7 V
If you have more information than ASKK:)
Thank youuu