For my model batteries I recharge at 1c the recommended rate. It isn't hard to have more than one battery.
I have battery powered my ubitxs but kept the battery outside the case. and put a volt meter on the front panel. I put the xt60 connectors for power on all the hf radios. To match the batteries.
Cell imbalance does happen and is the most serious issue with these batteries.
The batteries use a balance charger where each cell has a separate charging lead straight back to the cell.