You don't by any chance have the manual for this inverter? I want to change the batteries on mine and I can't see if there is a specific setting for different types of batteries.
Sorry to say, but I got out of this race long time ago. I would much rather invers R30k in my sound studio than waste it on a phone that will be out of fashion in less that 24 months. I'm very pleased to use my sub 5K Xiaomi phone, which is all I need to have a conversation with clients.