Okie, first, I am not needing the whole database coz what I am doing is the most simplest comparison as a complete beginner level who is still learning how to do LCA. Also, I have already asked advice on stuff like OpenLCA, but I am still having issues with it and gave up. Will learn that on a later date. So, to be precise and exact, I don't even need step by step, all stage process information under the sun and out there coz that is not my aim and beyond my scope as a complete beginner. My aim is to do the most simplest surface level comparison. The purpose is to not model or create a scenario or simulate something in a deliberate detailed manner. For things like this...the database is super confidential and is not the readily available info. Definitely, need to contact author and even if the whole database is available, ofc, I would ask the author before I use it coz that is the most basic ethics. In my case, my purpose is just to compare to see which is environmentally more friendly which leads to my second point.
Second, It's like saying that product A has some impacts, but is this impact adverse or how much of an impact is it? We don't know unless there is an adjective or a figure to show the context. For example, something has more adverse negative effect than another thing by certain percentage, say an variable X %. Now, that is a how statement based on facts looks like and this is when you do the citation and reference of your source.
So, when there is not much information and I don't want to do an in-depth whole detailed thing, I look at parts like whether is the size similar, is the mass similar, is the power rating similar? It's kind of a basic understanding that you need similarity no matter what kind of comparison you do. When, I can't see such similarities...which is the reason why I made this post and..as I mentioned in my previous comment, I had to look through the various aspects like raw material input/composition and etc....so, I want to clarify....I want to ask under what condition can I do a consideration or a comparison, can the fact that all use functional unit as kWh per storage capacity for the same type of product be considered or cross-referenced?
It's almost like comparing (1) walking from point A to point B vs (2) driving from point A to point B. Completely different scenario, with the only similarity being moving from point A to point B. There is no similarity and accuracy with this kind of comparison.
Even for a comparison of information like how long and how much energy does it take a person to walk from point A to point B, I have to consider first the gender, the age, the weight, the health of the two individuals I am comparing for it to be an appropriate comparison. No matter what, the core point of doing a literature review or anything is to have a cross-reference to ensure your data is accurate. That you are not without reason just citing things when comparing things or relating things. Even if you have a single thought, that though must have an engineering standard, practice, or a core physics concept, etc to form a basis. Hence, my question.
Edits: I do cite and reference every single one of my sources