charging 10Ah li-ion batteries in parallel
It's not a good idea to charge batteries in parallel, for any battery chemistry. If the batteries (cells) are in different states-of-charge, they may try to charge each other without any current-limiting between them. Better to charge them individually, so that the charger can sense each cell individually.

Cells that are permanently connected in parallel are usually assumed to all have the same state-of-charge.