Medistrom Pilot-24 Lite CPAP Backup Power Supply/Battery

Poor service & product from Respirico (Medistrom Pilot-24 Lite Batter/power supply) – I went into Respirico Salisbury Plains Adelaide, I was needing a power source for my Airsense 10 CPAP machine in order to go camping off grid, I stipulated on several occasions throughout my conversation with the lady that I needed a battery that MUST last a minimum of 3 nights otherwise i will look at other options that will last that time and she continued on to say that the Medistrom Pilot-24 lite battery power supply will definitely be appropriate for what I needed and therefore I went on to purchase it at $515, which is an extremely lot of money to come up with being on a disability pension.. After trusting the lady that served me, I went away on holiday camping off grid and found that I had a very big problem after the first night it went flat I then had to drive a distance to the nearest town to a chemist and they charged it for me thankfully.. upon returning home I went back to Respirico and explained that it lost all charge after 1 night and they perceived to tell me that I had to turn the heated hose setting off & to go away and try it again so I just recently went away again with all the settings turned off as stipulated and surprise surprise it once again only lasted 1.5 nights and had to rely on a lovely couple travelling Australia to charge it daily with their solar set up.. I've just come home and tried to return the battery as its clearly not what i asked for only to be told that they won't do anything about the battery as it's been used but I can send it away under warranty but it will cost me more money to which I can't afford being on a disability pension nor do I want a battery that will only last me 1.5 nights.. This makes me so very upset as its not a battery to charge my phone its a life saving product that I CAN'T live without not even for 1 night and it enables me to use my machine to actually breathe as I can't afford the luxury of staying in motels or caravan parks being on a disability pension and this company has taken advantage of me just to get a sale. I'm now not in a financial situation to be able to purchase something that will last as I stipulated in the very beginning as I spent alot to purchase this product.. Poor uneducated service from Respirico & product for something that MUST keep someone alive & breathing..