Operating fish finder using lithium battery

[wiperhunter2]

Well I went to three different stores that sell batteries but could not find an interstate store around here. The interstate store that use to be on Wall ave is gone now and from looking them up on line the only place that sells them now, in my area, are automotive repair stores. But the good news is I ask my son if he could get the app to work and it worked on his phone. Here are the results from each battery. What I thought was funny, is that even though the batteries have nearly the exact same voltage, they have different capacity. Here are the screen shots of each battery. A question for you guys, what is SOC and what is the difference between normal capacity and residual capasity?