Kloplop321 Posted October 29, 2007 Share Posted October 29, 2007 why are there three prongs on most portable electronics? I don't see how Grounding could work on a DC battery , would one just be sending out like a signal stating if it was a service battery or what? Link to comment Share on other sites More sharing options...
Explosive Misanthropy Posted October 29, 2007 Share Posted October 29, 2007 So you can plug it in..... Link to comment Share on other sites More sharing options...
Reaper man Posted October 29, 2007 Share Posted October 29, 2007 So you can plug it in..... ...you forget that you only need two leads for DC current. my guess is there might be a need for 2 currents (VCC) sharing a ground, but eh, I'm not 100% certain Link to comment Share on other sites More sharing options...
ken_cinder Posted October 29, 2007 Share Posted October 29, 2007 The question is VERY vague. Are we talking 3 contacts on the battery itself, or are we talking plugging the unit into the wall for charging? If it's the latter, it would be due to AC>DC conversion (Most using a bridge rectifier). Link to comment Share on other sites More sharing options...
Reaper man Posted October 29, 2007 Share Posted October 29, 2007 The question is VERY vague. Are we talking 3 contacts on the battery itself, or are we talking plugging the unit into the wall for charging? If it's the latter, it would be due to AC>DC conversion (Most using a bridge rectifier). I'm betting he means the battery, as I've seen lithium batteries with 3 contacts. Link to comment Share on other sites More sharing options...
ken_cinder Posted October 29, 2007 Share Posted October 29, 2007 Most likely a signal contact, or a loop for quick charging. These lithium batteries that charge very fast, don't waste/lost any current.That or it's a 2 cell, 4 state Li-Ion that would make that 3rd pin definitely a comms pin. If the battery is in a "trickle" state with less than 5v (As an example), the charger would only deliver a lower draw so as to not damage a possibly faulty battery (Sony-splosion anyone?) Link to comment Share on other sites More sharing options...
Kloplop321 Posted October 30, 2007 Author Share Posted October 30, 2007 Yes, I am talking about a battery, like this Cell phone one, or you can look at a psp one. Link to comment Share on other sites More sharing options...
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