What I want to know is if I have a 24v battery already, can I use it? Example: https://www.amazon.com/dp/B0748C6HZT/?coliid=I2SWLR1X1ZI0YI&colid=1TA0T84T5U11K&psc=1&ref_=lv_ov_lig_dp_it This is a 24V battery with good specs. It also costs FAR less than the going rate on "made for CPAP" battery packs...