my ego power+ mower won't start at all, no lights or anything, what gives?

Diagnosis

The total absence of LED indicators and power on the EGO Power+ LM2135SP typically points to a complete break in the electrical circuit between the battery cells and the mower's control board. This is rarely a motor failure and is almost always a connectivity or power-source issue. Because this model relies on a high-voltage DC system, the safety interlocks are designed to prevent any power flow if the battery is not physically locked into the chassis or if the safety sequence is bypassed.

The root cause is usually one of three things: a battery that has fallen into a "deep discharge" state where the onboard BMS (Battery Management System) shuts down the output to protect the cells, oxidized or dirty contact pins on the battery terminal, or a failure of the physical locking mechanism that prevents the battery from making full contact with the internal pins. You can confirm this by attempting to insert the battery into another EGO tool (like a blower or string trimmer); if the other tool works, the issue lies within the mower's battery bay or the safety switch assembly.

How to Fix It

Follow these precise steps to restore power to your LM2135SP:

1. Full Battery Extraction: Press the battery release button firmly and pull the battery pack straight out of the housing. Do not wiggle it side-to-side, as this can bend the contact pins.
2. Terminal Inspection: Use a flashlight to look into the mower's battery bay. Ensure the gold-plated contact pins are not recessed, bent, or covered in grass clippings and debris. If you see debris, use a can of compressed air or a dry cotton swab to clean the area.
3. Battery State Check: Press the fuel gauge button on the battery pack. If no lights illuminate, the battery is either completely dead or the internal fuse has tripped.
4. The "Hard Seat" Method: Slide the battery back into the bay. Instead of just sliding it in, apply firm downward pressure until you hear a distinct, audible "click." If the battery doesn't click, the locking tab is not engaging, and the power pins will not make contact.
5. The Start Sequence: You must follow the exact timing for the LM2135SP. First, press and hold the safety button (the small button located near the handle) for one full second. While holding that button, pull the blade control handle (the bail arm) all the way back toward the handlebar. Only then should you press the start button.

If That Didn't Work

• Deep Cycle Recovery: If the battery indicator is blank, place the battery on the CH2 charger. If the charger flashes red or does not recognize the battery, the pack may have dropped below the minimum voltage threshold. Leave it on the charger for at least 4 hours even if it doesn't seem to be charging; sometimes the charger performs a slow "wake up" cycle for deeply discharged cells.
• Bail Arm Calibration: Inspect the blade control handle (the bail arm) for any physical obstructions or buildup of dried grass. If the arm cannot be pulled fully back to the handlebar, the safety switch will not trigger, and the mower will remain completely dead to prevent accidental startup.
• Fuse/Control Board Reset: Remove the battery and hold the start button down for 15 seconds. This discharges any residual capacitance in the mower's control board. Re-insert the battery and attempt the start sequence again.
• Battery Terminal Cleaning: If you see a dull film on the battery's gold contacts, gently clean them using a microfiber cloth dampened with 90% isopropyl alcohol. Avoid using abrasive sandpaper, as this removes the gold plating and leads to future corrosion.

Heads Up

• Storage Temperature: Never store your EGO batteries in a garage or shed during freezing winter temperatures. Lithium-ion cells can suffer permanent capacity loss or trigger a safety shutdown if stored below 32°F (0°C).
• Charger Compatibility: Only use the official EGO CH2 charger. Third-party "universal" chargers can damage the BMS and permanently disable the battery's ability to output power to the mower.
• Debris Management: After every five mows, use compressed air to blow out the battery compartment. Small pieces of dried grass can lodge in the bay and prevent the battery from clicking into place, causing intermittent power loss.
• Battery Rotation: If you own multiple batteries, rotate them. Using a single battery for every mow while others sit empty can lead to cell imbalance and premature failure.