[citation][nom]drksilenc[/nom]at all the people replying to the first guy...i have a smartphone if i use it full bore for 4 hours its about dead... same way with most phones maybe hes using it as a internet modem at work cause hes on the road. if you do that it will eat your battery alive. or maybe hes just on it constantly. most phones only have 6 hours of talk time before there dead. my phone only has 250 min which is just over 4 hours so his battery may not be bad as you all think. o and alot of smart phones have this feature by stock[/citation]
How long can you manage to go without charging? My lord. I have a smartphone that's about a year old, if it has a full charge it will run for at least 3 days with no use. Typical use shortens that quite a bit, but if your phone can't even idle for more than a day without killing the battery something is super duper wrong. No phone should have a standby time of less than 24 hours, most all are rated far far higher (in the hundreds of hours). Of course as a smartphone owner, I do have sympathy for the intent of your argument as it is nice to leave the phone plugged in while I'm not mobile; but the power wasted in doing this does add up quite a bit.
Lets try thinking about another way this could work. How about setting the current threshold just a little lower, and integrating the release mechanism into the charging brick? If they have a novel powerless disconnect it has a zillion applications. What if you could plug your phone in, push a 'start' button on the charger, and it would power the phone until the current going to the phone was at or near 0. This way, it only disconnects after you unplug your phone. It saves you from having to unplug your phone AND the brick in order to completely shut off the charger, and it lets your phone idle on the charger if you want it to.
You could extend this concept for TVs, computers, and other 'vampire' devices by putting a charged capacitor or low power battery on the power-on circuit, so that your soft-power button or remote control could still bring the device back to life if it has been off for some time. Considering how much is wasted by appliances in the 'off' position, careful use of such a technology could go a long way to reducing energy consumption.