Put inverter in ups mode and remove 600va ups.
BTW,does the inverter goes all off when the mains go. Any overload indication or so?
If there is an overload indication,then battery is the culprit here else get your inverter's mosfet's checked.
Lenovo Yoga 520 14 inch 2 in 1 Laptop i3, 4GB,1TB
Condition is good, Everything fine. Stylus works fine too. Bought from Reliance digital in 2019. Selling because I want to upgrade (possibly gaming Laptop). With original box,bill lost but i think can be retrieved (would be useless anyway) from...