Nonsense

 

well just keep in mind that the longer it charges and the more time you charge the battery the less of a life span the battery will have. it might not damage it now, but it will wear it out faster. now we are talking about a tiny amount each time. it is truly a small amount, but it can add up.....so keep that in mind.

if you want to learn more about batteries that is in your phone head on over to battery university. it has a wealth of info, if you are interested.

 

Nothing in the User Guide about that causing any problems. What do you do if the phones rings while it's charging???
I have just purchased a Redmi Note 7 and have made calls and sent texts while it was charging and it's still working fine.

 

My observations are that if you can see a cover which can be removed easily (e.g. Samsung S4) there will be an easily replaced battery.
Most newer "smart phones" have builtin non-replaceable batteries and this Xiaomi Redmi Note 7 I own falls into that category.
In fact there is NO reference to removing the battery in the User Guide which comprises 53 pages of info.
The Xiaomi has a bevelled edge glass which neatly fits to the body and has no access points so I would not attempt to prise or lever this apart.
The battery is 4000 mAh battery which has extremely good ratings for Standby time. Mine will last 2 full days under normal useage before needing to topup the charge.