kingstingtin

Apparently, distilled water that I poured into the battery, was of poor quality because the self-discharge rate has grown.
Is it possible to replace the electrolyte is entirely a new one?

Sulphuric acid 38%.

Thank you Tom. I was worried that it might adversely affect the course of experimentation. Now I realized that I was worried for nothing.
Your answer led me to thinking. I have long noticed that when charging my battery, hydrogen he is going to quite large bubbles in the electrolyte. The bubbles are clamped between the plates and the frame or under the plates and can not go upstairs alone.
I looked around at them in red on the photo. Me to have to tilt or shake the battery so that they lifted up. But some of them do not give in to it.
Maybe this is the cause of my failed experiments? Because the area under the bubbles can not participate in the reaction properly?

Maybe I can answer you.
Usually it is sold ready-made.
I can only give the final density of the electrolyte: it should be 1,27-1,28 gram / ​​milliliter.
The acid does not evaporate. Only the water evaporates. Therefore, it is and add to the previous volume.

Thank you John. I'll add the water, hoping that it will not affect the results.

Hi all.
It has been about 30 charge / discharge cycles the battery.
I noticed that the electrolyte level has declined markedly.
Can or should I add water?
In one of the cells, the level will soon reach the minimum level.
Should it be at all?