Battery Not Fully Charging: 55 Ah 12V, Distilled Water Added, 5A consumption, 10.5V issue

Hello, I have a 55 Ah 12 v battery
Recently, I flooded it with distilled water because the cells were above the level of the liquid, I added enough to cover the water (what you can see after unscrewing the plugs, are probably the targets, I don't know anything about it) and then connected it to the charger.
After 5 hours of charging, the voltage was the same, i.e. 10.5V.
After 10 hours also the same.
The battery still consumes 5 A and is warm.
It behaves as always under load.
What could be the cause?

GT2x wrote:

...
After 5 hours of charging, the voltage was the same, i.e. 10.5V.
After 10 hours also the same.
The battery still consumes 5 A and is warm.
It behaves as always under load.
What could be the cause?

Which means It behaves as always under load ? You wrote as always that is, like an efficient battery. I think right?
Can you start the car with this battery or charge it much differently (several road bulbs in parallel)? If so, what is the voltage on it without load and with load. If you start the car, the voltage on it without load is higher than 10.5V (~ 13V). The meter is correctly pointing? These 10.5V are with the rectifier connected or disconnected? You provide information too selectively (incomplete) to draw meaningful conclusions.

One cell damaged, compact. The rest of the cells use too much voltage, hence electricity and heat.

Wlodek22 wrote:

One cell damaged, compact. The rest of the cells use too much voltage, hence electricity and heat.

Yet

GT2x wrote:

...
It behaves as always under load ...

Your conclusion contradicts the author of the topic. Although it's hard to guess what it means as always .

Measure the electrolyte density with the aerometer.

I was tired already, sorry for the lack of information.
I connected a 12V 70W car fridge to it and it worked, the voltage dropped to 9.9V.
The meter shows well for sure, the voltage after connecting the rectifier is 11 V.
Unfortunately, I do not have this device for the density of liquids, but I know that the electrolyte has never been changed, the battery is from 2010.

Added after 3 [minutes]:

All devices will not work on it because the voltage is too low.
On it, at a load of 8 Amps, the voltage from 13.5 V fell to 13.
Now it is similar, only with other tensions, but the difference is the same.
I was also wondering if it could be a contained cell, but what did it happen to?

]

GT2x wrote:

the targets were way above the fluid level ...... the battery is from 2010

Battery for disposal.

He's 7 years old anyway, but some of them work even longer. If I were you, I would have checked him more closely.

Added after 2 [minutes]:

What producer ??

When I get home, I will let you know which producer, because I don't remember exactly.
It worked fairly well, except for a small capacity (about 25 Ah, it was 55)
Only after adding distilled water something broke.
I always poured enough to keep it at the target level.

GT2x wrote:

WITH...
On it, at a load of 8 Amps, the voltage from 13.5 V fell to 13.
...

It was and se ne wrati. What was and is not recorded in the register. I was young and beautiful once too, and now ...

GT2x wrote:

...
I was also wondering if it could be a contained cell, but what did it happen to?

It happened because it happened. It was flawed and that's it. You don't need this information for anything.