HOW TO REPLACE ZMODO GREET PRO battery and where to purchase parts?

Hello, could not find the related doorbell, so chose a similar. but here is my doorbell.

Stopped working, because battery dead.

Upon opening, broke one of the small connectors… but was able to still have it running.

However, will appreciate if anyone would indicate where to find components, such as battery, tools (FULL NEEDED SET), connectors to fix this… as well as a video tutorial or some guides.

Thank you