Battery Charger versus Power Supply Unit

Generally no because a battery charger does not act like a constant voltage (or current) source and its output will vary depending on load characteristics and battery charger logic.

In some cases the varying output voltage may be acceptable, or the battery charger may be one specifically designed (read expensive) to both charge up batteries and power a load with a constant voltage (or current), but generally it is a bad idea.

You should use a proper power supply, they aren't expensive and using a battery charger in its place is just asking for more trouble than its worth (such as potentially damaging the electronics it is powering through excessive voltage fluctuation and/or insufficient current supply).

What did you want to power?

I have consumers like battery 185ah, RTU, gyro, and others navigation equipments..

Then definitely use a regulated power supply otherwise you may damage the equipment or it may not operate correctly.

Maybe, maybe not. It depends on what you have as a battery charger and what you need the power supply for. We are unable to see into your mind from here... yet.