AGM 12V 7Ah & 12Ah Battery Regeneration: High Temp, Distilled Water, & Charging Tips

Hello, I have several AGM batteries 12V 7Ah, and 12Ah with UPS, worked at a fairly high temperature. 30 degrees, so they are "dried" after connecting the meter, they indicate from 8-10V, of course, after connecting the automatic rectifier, the voltage immediately increases to 15V and the rectifier turns off.
I have read all TEAMT dedicated to battery regeneration, I already know quite a lot, but I also have a few questions, ambiguities ...

1. Cork the cells after adding distilled water? I did it, but some plugs when charging (20V 0.5A transformer + 1n4007 diode + 14V 0.15A bulb) fired after a while ... with this connection, the battery voltage is about 12-13V, the bulb is lit all the time, the battery is charging ok 150-200m

2. If the battery (other than above, in better condition?) 12V 7Ah when charging set to 14V 1A consumes max current (1A) and at the same time one cell is "boiling", what could this mean? After disconnection, the voltage drops to 12V, after connecting the 12V 21W bulb, the voltage drops to 9V but the bulb shines.

3. Battery charged with 14V with 0.2A for about 24h, disconnect from charging, wait, how much, can it discharge? Or maybe it loads too short, people wrote in the forum that they load for months ?? What about stopping the cells, water and traffic jams?

4. If I understood everything correctly, such batteries can be charged with such a set (20V 0.5A transformer + 1n4007 diode + 14V 0.15A bulb) or a higher power bulb to charge with higher current, but such a simple set as above will prevent battery overcharging, i.e. "accumulates" itself voltage and current too high for battery?

Mainly I mean "clogging" the goal, for stupid reason, if the traffic jams blow, there is no force to stop such a cell because it may end badly, on the other hand, if I leave the cells open for longer, will the water that I poured evaporate ?

I note that I do it purely as a hobby, and so I did different power supplies to test different batteries differently.

Can I stick to this statement:

"... the battery 12V / 7.2Ah is the discharge current 1 / 20C we get the closest to the 12V / 5W bulb. And such a bulb a functional 7.2Ah battery should discharge to 10.5V in 20 hours ..." source

First of all, if you add too much water, you will harm.

After UPS, there's nothing to regenerate, because dry batteries corrode very quickly. Open one and look for positive discs.

One smaller 6V 7Ah battery flooded completely and after pouring it was "rust", this battery works best ...

Two batteries 12V 7Ah I charge the second day with a current of about 150mA, at first the voltage was at 12.5V, now it dropped to 9 ... in one jumps from 9 to 11, One at 14V can download up to 4A, but then you can hear that it is cooking in the cells so I don't leave it for such a long time.
Initially, the batteries had about 8V, but they took 3-5mA, after flooding and waiting "started" as described above.

If I reason well, these 12V and 4A, and without charging a drop to 9V indicate a short circuit of one cell. When trying to measure individual cells, it also works out, one cell has 0.3V, similar to the other battery.

Take them to the purchase of scrap metal and with a little luck for a small fee you will find another toy, more promising. If you visit several scrap yards, you will find it at the bank.

But I like playing with acids and currents, so why do I have the joy of receiving it?

You did not understand
The batteries you have are "dead" and you will find other, still "alive" scrap.