Always fully charge batteries before installing.
Charge lithium batteries to the voltage you will be charging.
Just because they're new, doesn't mean they're ready to install.
https://js-alternators.com/battery-charging-and-maintenance/
https://js-alternators.com/yinlong-lithium-cells-faq/
https://js-alternators.com/getting-grounded-2/
High Output Alternators
Made in the USA