According to the brochure for a 2175B, it had a hydraulic lift and battery.
https://www.hilotrailer.com/home/then#1970 So, yes, if it has a hydraulic lift system, it would be powered by a battery. They are usually located in the trailer tongue, but yours may be in a compartment under a couch or dinette chair. If the top goes up, under power, you've got a battery.
Interestingly, the battery charging system was shown as optional, so you may have to charge the battery with a separate battery charger, which would be a total pain.
The Owner's Manual for the 1977 models shows the battery in the trailer tongue, next to the hydraulic pump and lift motor.
https://www.hilotrailerforum.com/f49...7-2577-a-1117/ I doubt your trailer would be significantly different.
- Jack