Is this charger suitable for a 18650 battery?
Yes, it is OK. The picture actually shows an 18650 cell being charged.

You might be confused by the 3.7 V and 4.13 V.

The fact is that the voltage of Li-Ion based cells (like 18650 cells) changes when it is charged and discharged.

3.7 V is sort of a "average" voltage for the cell when in use.

A reasonable low (empty) voltage for a Li-Ion based cells is 3.6 V

A reasonable high (fully charged) voltage for a Li-Ion based cells is 4.2 V

So the charger's 4.13 V is a good choice. Charging to a higher voltage (like 4.3 V) is possible but puts more stress on the cells so they wear out sooner. I think 4.13 V is a good compromise.

Learn more about this at Battery University.