Ryobi Ryobi RY40550 40V HP Brushless 14 in. Chainsaw BATT ALL BLINK Error Fix: Battery Fault — All 4 LEDs Blinking

Error code BATT ALL BLINK on the Ryobi Ryobi RY40550 40V HP Brushless 14 in. Chainsaw means: Battery Fault — All 4 LEDs Blinking. All four LED indicators on the Ryobi 40V battery pack are blinking simultaneously. This indicates the battery management system (BMS) has detected a fault condition and has entered protection mode. Possible causes include: internal cell imbalance (one or more lithium-ion cells have degraded beyond the BMS tolerance), over-temperature protection (battery was used or charged in extreme heat), overcurrent protection (the tool drew more current than the battery can safely deliver — typically from a stalled motor or severe overload), or internal short circuit detection. First, remove the battery from the tool and let it cool to room temperature for at least 30 minutes. Reinsert the battery and try again. If all 4 LEDs continue to blink, place the battery on the charger — some BMS faults can be cleared by a charge cycle. If the charger shows alternating red/green, the battery has an internal cell failure and must be replaced. Ryobi 40V batteries are covered by a 3-year warranty (5 years for select HP batteries).

The most successful fix is "Replace Battery Pack Due to Internal Cell Failure" (hard difficulty, ~30 minutes). Estimated DIY cost: $120-$150. HomeMD has 2 community-ranked fixes for this error.

This error is rated warning severity. It is generally not urgent and can often be resolved with a simple DIY fix.

Yes — the top-ranked community fix ("Replace Battery Pack Due to Internal Cell Failure") is rated hard difficulty and takes about 30 minutes. Tools needed: Multimeter.

DIY cost: $120-$150. Professional repair typically costs $150-$250. Many homeowners save money by trying the top-ranked community fix first.

The Ryobi Ryobi RY40550 40V HP Brushless 14 in. Chainsaw has 8 other known error codes, including: BATT COLD (Battery Too Cold to Operate or Charge), BATT DEPLETED (Battery Fully Depleted — No LEDs Lit), BATT OVERHEAT (Battery Over-Temperature — Tool Shuts Down), CHAIN BRAKE STUCK (Chain Brake Won't Release), CHAIN LOOSE (Chain Comes Off the Guide Bar), and 3 more.

Error code BATT ALL BLINK also appears on 4 other Ryobi models: Ryobi RY401018 40V 20 in. Brushless Push Mower, Ryobi RY401110 40V HP Brushless 21 in. CrossCut Push Mower, Ryobi RY40260 40V Expand-It Cordless String Trimmer, Ryobi RY40290 40V HP Brushless Whisper Series Jet Fan Blower. The fix may vary by model, so check each model's specific page for tailored repair steps.