I bought a led-acid battery ups system which I was told needed at least 12 hours of charging between load shedding sessions so alternated between a lithium battery
portable system and the main system. But despite complying with the 12 hour (which I often stretched to 24 hours and sometimes 36 hours) to make sure my led battery didn't run down to 50% and less, and only running an i-pad from it (not a computer) the system wasn't able to hold up to even an hour of load-shedding. I am now in the process of waiting for a refund from the supplier, who offered it with a 10% handling fee, and sincerely hope they will uphold their offer otherwise I will hand the matter over, as I feel the supplier needs to take responsibility for offering an inadequate system.