Probably vampire, or "not in use" energy draw.
Quote:
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Vampire loads (standby power) waste approximately $100 to $440 per year for the average U.S. household, accounting for 5%–25% of annual residential energy usage. Nationally, these idle, plugged-in devices drain over $19 billion to $26 billion annually.
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Most battery chargers use a small amount of electricity even when plugged in but not in use.
Same goes for other induction type inverters or whatever the heck they are called.
If a device is plugged into the 120v wall socket and has a black box inline that reduces the voltage or changes it to DC, it's eating up $ even when not in use.
Having your TV plugged in, a cable box, a VCR, and a DVD player (I know, old guy) can use enough power to run a light bulb 24 hrs/day (not an LED light, a real one
)
Think of all the things you have plugged in right now that don't need to be.
Things like a CPAP machine, a battery charger for your drill motor, etc.
All costing you money.
It's smart to have things like that on a switch that can be turned off when you turn off the device, but then you have to get the neighbors kid to reprogram the VCR clock every time.
Get off my lawn
Some modern chargers are being designed with "sleep mode" to shut themselves down and reduce the parasitic losses but less expensive chargers do not.