When a non-PD charger is used, L5 will by default draw at most 500mA, which should be enough to slowly charge it when idle with screen off, but not when in use.
When a PD charger is used, it depends on how much current the charger is claiming to support at 5V (we don’t use higher voltages at the moment).
In the future we may also be able to automatically detect BC1.2-compatible non-PD chargers and increase the input current based on that, but that’s not implemented yet.