I did'nt trust it, today. So i checked it out and once i turned the thing at it's side and saw the footer of the unit, i knew enough. How stupid was i, lol, thinking i could top off AGM based battery's, that where put standing inside a UPS case. These things are empty (without fluids) for a reason and the bit of water whats inside evaporates and all that due to the nature of the battery. When i topped it off and started to charge this thing fully inside the UPS, the only way the pressure could go was the ventilation caps, which in result dripped onto the bottom of the UPS case. It did'nt touch the floor, there's a bit of corrosion onto the casing itself; but so far i cleaned it well. The battery's themself where just warm; i mean handwarm, even when de-attached. It's as good as freezing outside tonight so i put 'm outside kind of to cool down now.
But, lol!
