First you need the battery to be truly full, then you set the AH counter to zero. The battery capacity in AH is a variable, so the counter can lose count quickly and needs to be reset fairly often to be useful.
EG with AGMs at 32F capacity can be 15% of what it is at 77F. That's after whatever the battery has lost due to age or neglect.
You must have a "marker" to tell you when the battery is full so you can reset the AH counter. I do not understand why it is so hard to get a straight answer agreed by many sources on just what that marker is for Li batts. We have that for other types of batts used in RVs.
When you actually stop the recharge for an Li bank depending on whether you are camping at the time or at home is another matter entirely, and info on that varies as we have seen.
Not my problem. :( You guys with Li batts can sort it out. I would hope at least you can see from this thread that there is conflicting/confusing info so you might need to get clarification so not to lose your expensive investment earlier than expected.