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Katel,
If you're wondering why you lose power even when WiFi is off and the unit is "off", the answer is that all rechargeable batteries have some self discharge and that most modern microcontroller or microprocessor based devices don't really turn off by disconnecting a battery.
You can sometimes gauge how good an electronic design is based on what it continues to do while powered down, and how minimal an effect the powered down condition has beyond the expected self discharge of the batteries. Of course, you have to allow for different levels of activity like those necessary to maintain a clock or look for an input or a remote control signal to turn the device back "on." Different devices require different processes to be maintained in the background while in sleep or "powered down" modes.
They power down into low current power saving modes whereby the processor can still keep track of some inputs -like the momentary switch that is used to turn them back on. The tipoff is whenever a device employs a switch that only has to actuated momentarily to activate the device. Older devices employed either sliding switches or locking momentary or click on/off switches that physically held a position once actuated and actually removed power from the electronics.
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