my ego power+ lm2135sp mower won't start at all, no lights or anything. battery is charged, what's up?

Check the fuse. The 4908 Fuse PCBA (part 201-14) is a common failure point. It's inside the power unit.

1. Remove the battery.
2. Open the battery cover assembly (part 201-401).
3. Locate the fuse PCBA. Check for a blown fuse or damaged connection.
4. If it's blown, you need the exact replacement part (2830216002).

If the fuse looks fine, the switch assembly (part 7) or the film switch (part 202-1) in the handle is bad. The switch assembly includes the main power contacts. No continuity means no power.

Before you replace any parts, ensure the battery is fully seated and the release button (part 201-13) on the battery pack is not stuck. A bad connection here gives the same symptoms.