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Thank you @Wayneo, what you see on screen is not liquid. This is the screen which had a hit few years ago. It is just the display which was not confortable.

Hello, I have had a Riva DNA 250C mod for several years. Everything was working perfectly until last week. I charge the batteries using an external Nitecore charger. I inserted a pair of fully charged batteries into the mod, but the battery indicator sometimes shows 4% and sometimes 0%. The batteries are definitely fully charged. I have tested several different pairs of batteries, and the problem remains exactly the same. The batteries are either 2x EFEST or 2x MXJO. I also checked the readings with Escribe, and Cell 1 is always around 2.1V, even when I swap the positions of the batteries. Could someone please help me identify the problem? Thank you very much.