new battery installed on older MacBook Pro

Typically you charge the battery to 100% and leave the charger connected for some hours. Then disconnect the charger and use the laptop until it powers off (hibernates) when the charge drops too low. The reconnect the charger and charge to 100% again. I'm not sure if this is repeated a second time or if one time is sufficient. This procedure was only ever suggested when installing a third party Lithium-ion battery....and maybe back in the days before Lithium-ion batteries for even Apple's own OEM batteries.

I'm glad it worked. Thanks for following up as it will help us assist other people plus anyone finding your thread will be informed as well.

I do recall some vendors recommended calibrating some batteries since the technology in even the older Lithium-ion batteries is a bit difference. I personally always like to charge a new battery to 100% and leave it there for a while before running the laptop on just battery especially since most batteries ship with less than 50% charge (best practice for storing a Lithium-ion battery and to minimize risk of accidental fire during shipping if the battery is damaged during shipping).

There has never been a calibration procedure, not for a very long time anyway. Consult the battery manufacturer or whoever performed that service for you.