@Nca78 Yes, it is true - if 240 mAh is the battery capacity, it would last for ~15 days.
However, I have measured my modules uninitialized, so it may be better if one sends it to sleep mode by software... I have not measured them in other modes.

@Tmaster Not necessarily. Marking is one thing, Nordic may used both square and solid circle (as far as I know they used both).
However, for 80 cent, I assume they are fake for sure.

@NeverDie No. I don't want to depend on other equipments and for better range, I may use other transmitters in the 866 / 433 MHz bands. However, in our projects, range was not really a limit, but sometimes delay had to be minimized.

@gohan External size is one thing, internals are more important - there are better (properly tuned) antennas in small size.
The RF24L01F20 module seems to be really good. Albeit it has PA, you may lowering the outside power a bit if necessary.

@Nca78 I have measured less than 1μA for real modules and about 660μA for counterfeit ones.
However, multimeter may also give invalid result...

@gohan They seem to be connected to GND.

Range depends on the specific ennvironment (walls, used materials like metals, etc), the channel used (if there are other noises like WLAN and so), reflections and such things.
You may also try better antennas or to reduce TX power to see if it runs better.

@gohan Regarding of battery powered system...

From STM32CubeMX power consumption calculator, it has the following current requirements:

In RUN mode:

• at 72MHz bus frequency, it needs 27 mA
• at 16MHz and HSI PLL, it needs 6.8 mA
• at 8 MHz and HSI, it needs 4 mA
• at 1 MHz and HSI, it needs 900 μA
• at 125 kHz and HSI, it needs 480 μA

In STANDBY mode with all clocks off, it needs 2 μA

In SLEEP mode:

• at 125 kHz bus frequency and HSI, it needs 410 μA
• at 1 MHz bus freq. and HSI, it needs 440 uA
• at 8 MHz, it needs 600 μA

Enabling the following peripherals, additional consumptions are (as for example):

• GPIOA needs 833.75 nA
• GPIOD needs 816.25 nA
• I2C needs 1.25 μA
• SPI1 needs 590 nA
• TIMER1 needs 2.92 μA
• TIMER2 needs 4.06 μA
• TIMER4 needs 3.99 μA
• USART1 needs 1.49 μA
• USART3 needs 1.53 μA
• USB needs 2.22 μA
• Window watchdog needs 312.5 nA
• Independent watchdog needs 1.71 μA
• ADC1 needs 162.19 μA

These are just some examples, not all possibilities and frequencies are listed here...

There are also lower power STM32 series anyway.

@alowhum I use the same board as dev board and it works well, I had no problems with it using STM32's own libraries.
It has I2C, SPI, UART, even USB and 5V-tolerant inputs and so on.
I like it.

@Reza What are you mean about "all channel was never busy"?
(I assume you tried free channels.)

Anyway, a simple wlan-scan only shows occupied wlan channels but not other communications (or noises) in the same frequency range.
Anyway, some modifications of the antenna may highly affects signal strength.

@Reza Don't forget it is only true if there are no other noises in that frequency like any WLAN radios at a nearby channel or microwave oven, etc.

Even a bluetooth connection can cause some loss as it is hopping from frequency to frequency.
Bluetooth works somewhat like in the tale - it does not interfere with other equipments but it interferes with all of them a bit...

So, if data integrity is really important, one should handle re-sending missing informations by software especially in wider ranges of distance. However, internal retry also helps.
(I don't know what mysensor's library do about this question.)