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</o:shapelayout></xml><![endif]--></head><body lang=EN-CA link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Dear Frans<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>The charging voltage for a great many laptops is 19-21 volts for a 6 cell Li-Ion battery.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Is it fair to say that it is safe to charge one cell with 4.2 volts, with an operating voltage of 3.2?<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>3.2 is enough to fire most HE-LED’s though many of the packaged units use 3.5 (for full brightness of white HE-LED’s).<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>19/6 = 3.2 (only) so perhaps 4.2 is a bit high. Are they using a pulse width modulated chopper to increase it to 25.2 as the charging voltage, or something else?<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>I recall some battery packs are charged as 2 parallel sets of 3 in series, but power is drawn as 6 in series. Those were 12 VDC input. Now they are all 19.2 or so. The one I use has a 9-cell and it is probably 3 sets of 3 in series when charging.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Breaking out the cells from an old laptop is a safe thing to do and probably some cells are better than others. In previous discussions here we have noted that an old (almost dead) cell phone battery can run 3 LED’s for a couple of weeks. ‘Dead’ to a phone or laptop is not at all dead to a light, especially the newest high efficiency small white ones.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Thanks for your continuing advice and enthusiasm.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Regards<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Crispin<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><div><div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0mm 0mm 0mm'><p class=MsoNormal><b><span lang=EN-US style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span lang=EN-US style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> Frans Peeters [mailto:peetersfrans@telenet.be] <br><b>Sent:</b> Thursday, February 02, 2012 9:03 AM<br><b>To:</b> Stoves <br><b>Subject:</b> TEG geat idea / Li ION recup small idea<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><span lang=NL style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Dear RON LARSON ,<o:p></o:p></span></p><p class=MsoNormal><span lang=NL style='font-size:10.0pt;font-family:"Arial","sans-serif"'><o:p> </o:p></span></p><p class=MsoNormal><span lang=NL style='font-size:10.0pt;font-family:"Arial","sans-serif"'> With KNOW HOW…., a smal idea can become a geat idea for Africa !<o:p></o:p></span></p><p class=MsoNormal><span lang=NL style='font-size:10.0pt;font-family:"Arial","sans-serif"'>The World is over full with LAPTOPS and weak powerpacks !<o:p></o:p></span></p><p class=MsoNormal><span lang=NL style='font-size:10.0pt;font-family:"Arial","sans-serif"'>DELL :It contains 8 Li ION cells of 3,7 volt 3,5Ah<o:p></o:p></span></p><p class=MsoNormal><span lang=NL style='font-size:10.0pt;font-family:"Arial","sans-serif"'>And regulator prints inside -----</span><span lang=NL style='font-size:10.0pt;font-family:Wingdings'>à</span><span lang=NL style='font-size:10.0pt;font-family:"Arial","sans-serif"'> secret !!<o:p></o:p></span></p><p class=MsoNormal><span lang=NL style='font-size:10.0pt;font-family:"Arial","sans-serif"'>80% of this broken or wasted packs can be used for head lichts and home lichting , with 24 LEDS;<o:p></o:p></span></p><p class=MsoNormal><span lang=NL style='font-size:10.0pt;font-family:"Arial","sans-serif"'> you get one week lichted evenings !<o:p></o:p></span></p><p class=MsoNormal><span lang=NL style='font-size:10.0pt;font-family:"Arial","sans-serif"'>You put all the cells in paralel .<o:p></o:p></span></p><p class=MsoNormal><span lang=NL style='font-size:10.0pt;font-family:"Arial","sans-serif"'>And charge by sun with a 10x5 cm sun panel end <b><span style='color:red'>limit the voltage on 4,2 Volt</span></b> like ZX4,2 zener diode<o:p></o:p></span></p><p class=MsoNormal><span lang=NL style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Not more, for explosion danger .<o:p></o:p></span></p><p class=MsoNormal><span lang=NL style='font-size:10.0pt;font-family:"Arial","sans-serif"'>It contaains Fluorinated ether !!!<o:p></o:p></span></p><p class=MsoNormal><span lang=NL style='font-size:10.0pt;font-family:"Arial","sans-serif"'><o:p> </o:p></span></p><p class=MsoNormal><span lang=NL style='font-size:10.0pt;font-family:"Arial","sans-serif"'> (For the laesy and fortunated…. :www.CONRAD. de could sell rechargeable Lithium ION cells ! Not to find in a shop . ) <o:p></o:p></span></p><p class=MsoNormal><span lang=NL style='font-size:10.0pt;font-family:"Arial","sans-serif"'> <o:p></o:p></span></p><p class=MsoNormal><span lang=NL style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Regards<o:p></o:p></span></p><p class=MsoNormal><span lang=NL style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Frans .<o:p></o:p></span></p><p class=MsoNormal><span lang=NL style='font-size:10.0pt;font-family:"Arial","sans-serif"'><o:p> </o:p></span></p><p class=MsoNormal><span lang=NL style='font-size:10.0pt;font-family:"Arial","sans-serif"'><o:p> </o:p></span></p><p class=MsoNormal><span lang=NL style='font-size:10.0pt;font-family:"Arial","sans-serif"'><o:p> </o:p></span></p></div></body></html>