Battery power supply

To further, an internet search seems to stipulate that this is a lithium battery and a true sine wave output. But it seems that information is limited. And the advertisement that I linked may be wrong. 

Yes. Thank you. I have the ps p500 and the PS Audio power plant premiere. I like them. Unfortunately the p500 only has the pass through outlet working and the premiere has only one outlet working. It would be a pretty penny to fix both. 

I was was looking at this product as a way to get completely off the grid.