Do all batteries have the same capacity?

They can have different capacities on account of size or age, but the same chemistry (e.g. all flooded lead acid or all AGM). Before you start charging, the voltage across each of them is the same–even if one is fully charged and the others aren’t. Charge will flow from one battery to the other two until they’re balanced.

What is the difference between charge and discharge pack capacity?

The difference of the charge and discharge pack capacity is also significantly small so that we use the discharge pack capacity as the pack capacity. The pack capacity before aging is 11.76 Ah and is less than cell capacities. This may be explained by measurement errors.

Does cell capacity loss contribute to pack capacity loss?

The results show that cell capacity loss is not the sole contributor to pack capacity loss. The loss of lithium inventory variation at anodes between cells plays a significant role in pack capacity evolution. Therefore, we suggest more attention could be paid to the loss of lithium inventory at anodes in order to mitigate pack capacity degradation.

Will adding more lithium affect battery performance?

The imbalance will most likely not be affected by adding another lithium. But the overall performance might be affected. The entire battery is only as good as the weakest cell in it (edit: the last sentence is true for a single battery - cells are in series to build a 12.8V battery). To wrap this up:

What is battery cell capacity loss?

Battery cell capacity loss is extensively studied so as to extend battery life in varied applications from portable consumer electronics to energy storage devices. Battery packs are constructed especially in energy storage devices to provide sufficient voltage and capacity.

Does lithium inventory decrease if a cathode is type IV?

Though the total lithium inventory does not decrease as the lithium inventory is transferred from the anode to the cathode, Type IV leads to LLI at anode without releasing energy to the load, and thus is different from a discharge process or cell capacity fade. Anode LLI in Type IV has no capacity fade but reduces cell electric quantity.