The housing is made of opaque impact-resistant ABS plastic. The battery cover is securely connected to the housing, and the terminal areas are sealed. The terminal design depends on the series and type of battery. The battery cover has six holes through which the battery is filled with electrolyte during the production process. Pressure relief valves are then installed in the filling openings. The pressure relief valves ensure a high level of fire and explosion safety. They are made from non-combustible materials. The positive and negative plates are paste-coated. The batteries can be installed in both horizontal and vertical positions. The expected service life in cycles under normal operating conditions is as follows: EVP series: up to 1700 cycles.