answer:well…I wouldn’t necessarily say it over charges…more like, it takes it to a full 100% charge, and the moment it drops to 99%, it charges it again….I’ve never seen my phone go past 100% on a charge….so in a sense, it’s a continual state of charging, but never over charges. Simply unplug it when it is fully charged to reduce the chance of developing any sort of memory in the battery. ...on a laptop, simply take the battery out once you’re on a full charge, and just use the AC wall adapter. And once you’re ready to get on the go again, put the battery back in your laptop. I’ve not seen any chargers that will turn themselves off once you reach a full charge, and then not recharge it once it drops below 100%. At least in the world of retail I haven’t seen anything like it. And as far as not having something like that…not sure, probably has something to do with the cost to benefit to include a feature like that. I have however seen chargers that will give a green light to indicate a full charge, and and orange/red light if it is charging still. Hope it helped.