What are the subtleties of android smartphones when buying and working?

Question

Mobile devices

I formulate the question as informatively and unambiguously as possible ....
Please help with authoritative advice ...
after all, many IT specialists can understand the device of smartphones?
I don’t have enough cabbage, but I don’t understand how to find a sane smart android (5-9) for 5000-10000 rubles with a solid screen
, I have 4GB of built-in memory. not enough. A camera of less than 8 megapixels is also not enough. Well, 2500 mAh batteries are not enough for me. (It would be nice to have two connectors for charging .. ancient and micro usb) ... Preferably a removable battery.
Glass is stronger! and battery 3000-9000 mAh!!!
which case is stronger and which glass is stronger? - THIS IS THE MOST PAINFUL QUESTION
AND THE SECOND WHAT REMOVABLE BATTERIES ARE BETTER - SLOWER WEAR?
Which versions of android hang for me and which manufacturers are less buggy?
(I only know a little about android 4 and fly + hiaomi and that’s all)
when I work in accounting and in the IT field, I need a smart
one - well, I watched vidos and listen to lectures
and take pictures of documents ... similar to a manual scanner ...
+ voip
which is bad ? (BLACKVIEW BV6000S, FLY POWER PLUS 3 CHAMPAGNE, OUKITEL C11 PRO)
can you see models with a powerful Wi-Fi antenna somewhere?

Answer 1

the operating system is important: if it wasn’t for the battery, I would recommend the old OnePlus
Honor is not bad, also
look in the direction of Nokla, they recently updated the line
, well, PowerBank or charging in the office - Android satellites)
I try to use the latest OnePlus, as a rule (in addition to the iPhone)

Answer 2

Don't worry, they all hang.
Well, the subtleties are wild power consumption, unoptimized software, lack of updates from the manufacturer, a soapy camera and a Rubik's Cube name screen, virus-ridden by Google Play.
Probes are included, you do not need to install separately.
In a year they will start wildly, godlessly slow down.
Of course, there are flagships that can last 3-5 years, but you have chosen typical laophones.

Answer 3

4500 mA / h for a budget Android smartphone is good?
BLACKVIEW BV6000S
or android 6 is old and soon google play will throw it out?
... I have to use for five years after all
, and the camera and the RAM and the built-in memory are good? (I'm not a gamer)
and I will change two batteries ... (there is sometimes no electricity for weeks)