You press "Start." Your Coredy wakes up, spins for 5 minutes, and then suddenly stops or cries for the charging dock.
You might be thinking: "But I just charged it all night!" or "I barely use this robot, how can it be broken?" or even "I just got this as a gift, it was brand new in the box!"
We hear you. At the Coredy Home Environment Cleaning & Health Center, this is the #1 question we receive. The good news? Your robot isn't broken. It just needs a fresh heart.
Here is the truth about robot vacuum batteries that most manufacturers don't tell you.
Myth #1: "It was brand new in the box, so the battery must be new."
This is the most common misunderstanding. We recently helped a customer, Madison, who received a Coredy R500+ as a gift. It had been sitting in her mom's closet for a few years, sealed in the box. When she finally opened it, the robot wouldn't run for more than a minute.
The Science: Robot vacuums use Lithium-Ion (Li-ion) batteries, the same tech in your smartphone or Tesla.
- Self-Discharge: Even when turned off, Li-ion batteries slowly lose charge over time.
- The "Deep Sleep" Danger: If a battery sits at 0% for too long (e.g., 6 months or more), the internal chemistry degrades. The battery enters a "deep discharge" state and can no longer hold energy.
- The Result: Even if the robot is "new," the battery has aged. It’s like buying a car that has sat in a garage for 3 years without starting—the tires are flat and the battery is dead.
Myth #2: "I rarely use it, so the battery should last forever."
Logic suggests that low mileage means less wear and tear. Unfortunately, batteries adhere to the "Use It or Lose It" rule.
Batteries are designed to be exercised. If you leave your robot on the charging dock for months without running it, the battery sits at 100% constant voltage, which can stress the cells over time. Conversely, if you unplug the dock and let the robot sit in a closet for months, it will drain to zero and die (see Myth #1).
💡 Pro Tip: If you plan to go on a long vacation, charge the robot to roughly 50%, turn off the main power switch (on the side), and store it in a cool, dry place.
Signs Your Battery Needs Replacement
How do you know if it's the battery and not a motherboard issue? Look for these 3 signs:
- The "5-Minute" Run: The robot charges for hours (solid blue light), but only cleans for a few minutes before turning red or stopping.
- The "Drunken" Behavior: The robot leaves the dock, spins in a circle, and immediately tries to go back to the dock (because voltage drops instantly).
- The "Dead" Gift: You unboxed a unit that was manufactured more than 2 years ago, and it won't wake up even after charging.
The Easy Fix: It's a Consumable, Not a Catastrophe.
Think of your battery like tires on a car or filters in a water pitcher. They are consumable parts. They are designed to degrade over 12-24 months of use (or storage).
Replacing the battery is the single most effective way to restore your Coredy to peak suction power and 120-minute runtimes. It takes less than 2 minutes and requires only a screwdriver.
Don't buy a new robot. Just give it a new heart.
