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4 LEDs flash red

4 LEDs flash red — General battery error

Stihl · AP System

What does 4 LEDs flash red mean?

A general error has occurred within the battery. This could be due to connection issues or a more significant internal fault.

Common Causes

  • No proper electrical connection between battery and product
  • Battery or product is damp
  • Internal battery error

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Remove the battery and reinsert it firmly into the product.

  2. 2

    Ensure the battery and the product's compartment are dry and clean.

  3. 3

    If the problem continues, do not use the battery and contact a STIHL authorized dealer.

Browse all codes in this manual (12)
Verified technical data. Last updated: April 2026

Related Faults

1 LED flashes green1 LED flashes green — Battery charge is too low1 LED lights up steady red1 LED steady red — Battery is too warm or too cold2 lit green LEDs2 lit green LEDs — Battery charge between 40% and 60%
Source: Stihl AP System
Open Manual (Page 8)Search more codes in this manual