Thread: Can some devices be powered directly from a wall outlet?
View Single Post
Old 01-19-2015, 08:13 AM   #14
davidfor
Grand Sorcerer
davidfor ought to be getting tired of karma fortunes by now.davidfor ought to be getting tired of karma fortunes by now.davidfor ought to be getting tired of karma fortunes by now.davidfor ought to be getting tired of karma fortunes by now.davidfor ought to be getting tired of karma fortunes by now.davidfor ought to be getting tired of karma fortunes by now.davidfor ought to be getting tired of karma fortunes by now.davidfor ought to be getting tired of karma fortunes by now.davidfor ought to be getting tired of karma fortunes by now.davidfor ought to be getting tired of karma fortunes by now.davidfor ought to be getting tired of karma fortunes by now.
 
Posts: 24,905
Karma: 47303824
Join Date: Jul 2011
Location: Sydney, Australia
Device: Kobo:Touch,Glo, AuraH2O, GloHD,AuraONE, ClaraHD, Libra H2O; tolinoepos
Quote:
Originally Posted by Masutin View Post
Thank you all for thoughts!
To clarify, I was wondering about a device that can alternate between DC power (via AC adaptor or USB) and battery power, as in laptops or netbooks?
Even simple phones work while being charged, but I presume the power goes through the battery still, as probably there is no other way. True, portable devices are not meant to be plugged in permanenty. But for uses near a fixed power supply, again laptops and netbooks aside, I envisage a unit with an e-ink or a color screen that uses the battery only as required.
No, you have it wrong. All devices with rechargeable Li-Ion batteries will not use the battery at all when they are plugged in. They will be running off the power while charging the battery. Once the battery is fully charged, the charging circuit will be turned off and the battery will sit idle until you unplug the device. This is done to prevent damage to the battery. If it is overcharged, it will reduce the life and possible be damaged. And damaged in a way that is dangerous.

Assuming the device is properly designed, there is no real problem with leaving them plugged in.
davidfor is offline   Reply With Quote