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Sphero Robot Battery Information

What Type of Batteries Are Used in Sphero Robots?

Sphero robots contain lithium ion batteries. These are different than the batteries you typically buy at the store because of their power density - meaning they are really small, but produce a large amount of power!

Each Sphero product uses a custom battery designed to fit its compact design.

Why Isn’t My Battery Holding a Charge?

All rechargeable batteries wear out over time. Two main reasons your robot’s battery may no longer hold a charge are:

  • Age: Batteries naturally lose capacity and eventually stop working.

  • Charging cycles: Each charge and use cycle wears out the battery’s cathode, reducing capacity over time.

I Haven’t Used My Robot in a Long Time. Why Won’t It Work?

Even when not in use, batteries lose performance every year - typically 20–35% annually, depending on storage conditions and temperature.

How Can I Extend the Life of My Battery?

To maximize battery life:

  • Put your robot into deep sleep when not in use.

  • Before deep sleep, run the battery down to around 50% if possible.

  • Store in a cool area, never on the charger.

Additional notes:

  • Putting a robot back on its charging base will wake it from deep sleep.

  • Robots stored in a Power Pack can remain on the cradles, but the Power Pack must be unplugged.

  • For RVR/RVR+: Disconnect projects when not in use, as the USB and Universal Expansion ports can draw power even when the robot is “off.” You can also remove the battery to avoid slow drain.

Can I Replace or Repair the Battery?

  • Most Sphero robots have sealed polycarbonate shells that make them waterproof and durable. Because the shells are fused, the batteries cannot be replaced.

  • Do not attempt to open your robot—it will void your warranty and may be dangerous.

Exceptions:

  • RVR and RVR+: Have replaceable batteries that can be purchased separately.

  • Sphero Mini: The shell can be removed, but the battery itself cannot be replaced.

How Do I Know if My Battery Is Dead?

Round Sphero Robots (e.g., SPRK+, BOLT, etc.)

  1. Place the robot on the charging base for at least 3 hours. Ensure the outlet is working and the heavy side of the robot is properly seated.

  2. After charging, remove the robot:

    • Flashing red or no lights: Indicates a low or dead battery.

    • Check battery level in the Sphero Edu app in:

      • The top right corner (when connected).

      • The robot connection screen.

RVR and RVR+

If RVR/RVR+ is charged correctly but only shows one LED light on the indicator:

  • Try charging with the following guidelines:

    • 1A charger (computer USB, basic phone charger): 10–12 hours

    • 2A charger (tablet or 2.1A phone charger): 4–6 hours

    • Quick Charge 3.0/USB-PD (high-end phone charger): 2–4 hours

  • If charging times are correct but the battery still shows low levels, please contact us here.