In my soundcore r50i nc earbuds , when i put the buds into case the charging indicator is not working , is there any glitch there or i need any firmware version update ?
Could be a firmware issue. It is very simple to check the version and any current updates:
Make sure your headphones are connected to your phone via Bluetooth.
Open the Anker soundcore app and tap on your headphones in the devices list (the connection should be showing as active)
Tap again to go into the management for your headphones
Click on the cog in the top right and the option is Firmware Update.
If you are still having issues I would reach out to support for assistance under the warranty (you can do this via the app too!) 
Hope that helps! 