Diagnosis
The iRobot Roomba i3+ EVO Home Base is designed as a "constant-on" device. It uses a low-voltage standby circuit to maintain a handshake with the robot and monitor the charging state. While the base itself consumes negligible power when the robot is not docked, the primary concern is not the base's electricity usage, but the chemical degradation of the robot's Lithium-ion battery pack. When a Roomba remains docked for extended periods without cycling (discharging and recharging), the battery can enter a state of "trickle-charge saturation." This can lead to a decrease in overall battery health, reduced runtime per cycle, or in extreme cases, a battery that fails to wake from a deep sleep state. If you leave the robot docked while you are away, it will periodically attempt to maintain a 100% charge, which accelerates the wear on the cells. Confirming this is simple: if you return from a two-week trip and find the robot only lasts 40 minutes instead of its usual 75, the battery has suffered from idle degradation.
How to Fix It
To preserve the longevity of your i3+ EVO and ensure the Home Base remains safe, follow this specific shutdown and storage sequence:
- Clear the Bin: Empty the dustbin inside the robot and the Clean Base bag if it is near capacity to prevent moisture buildup or odors while stagnant.
- Physically Detach: Manually lift the Roomba i3+ off the charging contacts of the Home Base. Do not use the "Dock" command; physically move it away.
- Hard Shutdown: Press and hold the CLEAN button for exactly 10 to 15 seconds. You will see the light ring fade out completely. This disables the standby mode and puts the robot into a "Deep Sleep" state, stopping all parasitic battery drain.
- Base Power: You can leave the Home Base plugged into the wall outlet. It does not have a heating element or a high-draw motor that would pose a fire risk while idle. However, if you are traveling to an area with unstable power grids or frequent lightning storms, unplugging the base from the AC outlet is a recommended precaution against power surges.
- Environment: Place the powered-down robot in a climate-controlled area. Avoid garages or attics where temperatures fluctuate, as extreme heat or cold will permanently damage the lithium cells.
If That Didn't Work
- Battery Recovery: If you return from vacation and the robot won't power on, place it on the Home Base and leave it for 24 hours. If the light ring flashes red or doesn't ignite, you may need to replace the battery pack (Part #4410) as it may have dropped below the critical voltage threshold.
- Resetting the Base: If the Home Base seems unresponsive after being unplugged for weeks, perform a power cycle. Unplug the power cord from the back of the base, wait 30 seconds, and plug it back in. This resets the internal logic board of the self-emptying mechanism.
- Firmware Update: Upon your return, immediately trigger a manual update via the iRobot Home App. Long periods of inactivity can lead to version lags, and the robot may struggle to connect to Wi-Fi if the firmware is outdated.
- Contact Cleaning: If the robot fails to charge after your trip, use a dry microfiber cloth or a cotton swab dipped in 70% isopropyl alcohol to clean the two silver charging contacts on the bottom of the robot and the two spring-loaded pins on the Home Base.
Heads Up
- Avoid Total Discharge: Never store the robot in a completely dead state. Ensure it has at least a 50% charge before performing the hard shutdown to prevent the battery from entering a permanent "sleep" mode.
- Dust Bag Caution: If you live in a humid environment, avoid leaving a full dust bag in the Home Base for months, as organic debris can mold, which may be sucked back into the robot's internal vacuum path upon restart.
- Avoid "Sleep" Mode: Do not confuse the "Hard Shutdown" (holding CLEAN) with simply letting the robot go to sleep. Only the hard shutdown stops the battery from slowly draining over several weeks.