SLOT4FS battery mod - how to?

One of the 4 slot boards I wanted to do a battery mod on happens to be a 4FS and from what I can see I doesn't have the usual 470 ohm resistor.

Anyone that have any idea which one has to go for popping in a normal battery? My guess is the 220 but I'm not sure

Thanks in advance

It's the 220ohm, I've done a 4FS before.

You might want to wash the boards though, they are dirty. Dust is a magnet for corrosion.

Thanks mate! And yeap, they're headed for a bath. I've got about 10 2 and 4 slot boards in need of repairs and clean up.