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After two years of operation, the gel battery partially stopped accepting charge. The Chinese inverter dropped it below 6 volts. Charging with a pulse charger and a laboratory power supply unit gave practically no result. On the vastness of YouTube and the Internet, there is material showing how to solve this problem, you just need to add distilled water to the battery banks. But! I did not find any video materials that talk about the importance of checking the battery under load. After all, with a normal test with a multimeter, my battery showed a normal operating voltage of 12.5 volts. The video was shot for a better understanding of the processes that occur with the battery with an incorrect concentration of electrolyte.