different camera models may use different batteries and charger
also, some modern models now allow charging via usb, so can use your usb charger or powerbank, instead of buying dedicated charger/battery
the process to start, perhaps is to check your camera manual to see of usb charging is available
if don't have usb charging, then google search your camera model + the word charger or battery, e.g. canon m6 charger. then you should see different 3rd party solutions
then you can google those specific 3rd party model names to see the reviews for them, and whether they are available for purchase