I won't worry about switching power supply, it consume very litttle energy
in low output mode. My wife's Samsung consume less than 2W even with
computer connected in sleep mode (no battery). My laser printer consume less
than 5W in sleep mode with Wi-Fi standby. My desktop consume less than 2W
when switched off.
For computer, if you want to save power, use the latest Intel CPU and a high
efficiency power supply. I have the 80 plus bronze, I would like to have the
sliver or gold but they are much more expensive. The uncertified power
supplies usually have around 70% efficiency.
http://en.wikipedia.org/wiki/80_Plus
For phone, most users worry about the battery has too low capacity, lower
the charging level may not be a good idea. Smart phones draw a lots of power
(relatively), the battery won't stand at high cell voltge for too long. How
long the battery last may not be a big problem for smart phone users, most
of them change their phone in half to 2 years.
C.H.Ling
----- Original Message -----
From: "tOM Trottier" <tom@xxxxxxxxxxxxx>
> Recent Dell laptops ( I have a 5720) also have an option to keep the
> battery at about
> 78% of full charge while plugged in. Lithium Ion rechargeable batteries
> wear out faster
> kept at 100% / 4.2volts.
>
> This applies to laptops and phones and others. Electric cars never charge
> to 4.2v/cell
> because the battery life is so reduced. On Android, you can use the
> Battery Monitor
> Widget to signal when it has reached a certain recharge level (use max
> voltage "4334"
> for ~76%).
>
> But it's not just the device. The powerbrick transformers consume some
> power even
> when no device is attached! Some power supplies do turn off when no load,
> but most just
> use power all the time. That's the main reason instructions read "Unplug
> power supply
> when battery full."
>
> You can get some smart "greenpower" strips which turn off all other
> outlets when one
> (the computer) outlet is asleep/hibernating/off. E.g.
> http://www.amazon.com/Monster-MDP800-Powercenter-8-Outlet-Rating
>
>
> tOM
>
> 2013 Oct 03 - Thu at 7:25 re:Re: [OM] Keeping Your Laptop Plugged in All
> the T …
> C.H.Ling <olympus@xxxxxxxxxxxxxxxxx>wrote …
> …
>>Some newer notebook computers have the option to set battery charge
>>to less than 100%, my wife's Samsung can set full charge to 90% to
>>save battery life. Even so it always have the battery removed as it
>>is for home use only.
>>
>>C.H.Ling
>>
--
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