Removed user draining battery in Android 5.0 Lollipop

After you try the guest user mode in Android 5.0 Lollipop and delete it to return your own user profile, you may notice that in the battery usage, there is one item on the top, "Removed user", and the battery usage percentage is increasing.

To solve this problem, the following step may help.

1. First make sure the use details of the removed user actually do NOT change over time (click on the "Removed user" in the battery status page to see use details). Note that, the battery usage percentage may still be increasing. If the use details change, try to enter into guest mode again, and delete.
2. When your phone or tablet asks you to recharge, turn off your device, and recharge it.
3. When the battery is full, turn on your device and the removed user should be gone.