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<p class=MsoNormal><span class=EmailStyle19><font size=2 color=navy face=Arial><span
style='font-size:10.0pt;mso-bidi-font-size:12.0pt;font-family:Arial'>Just FYI<o:p></o:p></span></font></span></p>
<p class=MsoNormal><span class=EmailStyle19><font size=2 color=navy face=Arial><span
style='font-size:10.0pt;mso-bidi-font-size:12.0pt;font-family:Arial'> <o:p></o:p></span></font></span></p>
<p class=MsoNormal><span class=EmailStyle19><font size=2 color=navy face=Arial><span
style='font-size:10.0pt;mso-bidi-font-size:12.0pt;font-family:Arial'>I did use
a similar two-battery system; the problem is that you have to find a high
capacity diode (I used at least 1.5 Amp or higher, which is better).<span
style="mso-spacerun: yes"> </span>The voltage drop is </span></font></span><font
size=2 color=navy face=Arial><span style='font-size:10.0pt;mso-bidi-font-size:
12.0pt;font-family:Arial;color:navy'>0.7 for silicon diodes, this works well
with 5C batteries.<span style="mso-spacerun: yes"> </span>However, using
diodes introduces an additional single point of failure but having two
independent systems balances this to some degree.<span style="mso-spacerun:
yes"> </span></span></font><font size=2 color=navy face=Arial><span
style='font-size:10.0pt;mso-bidi-font-size:12.0pt;font-family:Arial;color:navy;
mso-color-alt:windowtext'><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;mso-bidi-font-size:12.0pt;font-family:Arial;color:navy'> </span></font><font
size=2 color=navy face=Arial><span style='font-size:10.0pt;mso-bidi-font-size:
12.0pt;font-family:Arial;color:navy;mso-color-alt:windowtext'><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;mso-bidi-font-size:12.0pt;font-family:Arial;color:navy'>Now I use two
batteries each with a switch and charging jack and no isolation between the
two.<span style="mso-spacerun: yes"> </span>The primary battery is a 5C
(NiCd or NiMH) or Li-Ion with a 5.6 Volt regulator (other will work too 5.2 –
6.0 volt).<span style="mso-spacerun: yes"> </span>The backup battery is a
small 4C NiCd 250 mAh.<span style="mso-spacerun: yes"> </span>Both switch
connections plugged straight to the receiver.<span style="mso-spacerun:
yes"> </span>If you have to plug it through a Y with a secondary type
servo (throttle or gear).<span style="mso-spacerun: yes"> </span></span></font><font
size=2 color=navy face=Arial><span style='font-size:10.0pt;mso-bidi-font-size:
12.0pt;font-family:Arial;color:navy;mso-color-alt:windowtext'><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;mso-bidi-font-size:12.0pt;font-family:Arial;color:navy'> </span></font><font
size=2 color=navy face=Arial><span style='font-size:10.0pt;mso-bidi-font-size:
12.0pt;font-family:Arial;color:navy;mso-color-alt:windowtext'><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;mso-bidi-font-size:12.0pt;font-family:Arial;color:navy'>What happens in
this system is that the primary battery chargers (equivalent to trickle charge)
the secondary battery and keeps it at ~ 5.3 (with the 5.6 Volt regulator).<span
style="mso-spacerun: yes"> </span>If the primary battery fails the secondary
will be enough to land, if the secondary fails the primary will do the landing
duty.<span style="mso-spacerun: yes"> </span>This assumes only an open
circuit failures on a switch, plug, or even battery etc.<span
style="mso-spacerun: yes"> </span>I generally charge both batteries, but
if I do not, I notice a little larger drain after the first flight on the
primary battery (equivalent to two flights). </span></font><font size=2
color=navy face=Arial><span style='font-size:10.0pt;mso-bidi-font-size:12.0pt;
font-family:Arial;color:navy;mso-color-alt:windowtext'><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;mso-bidi-font-size:12.0pt;font-family:Arial;color:navy'> </span></font><font
size=2 color=navy face=Arial><span style='font-size:10.0pt;mso-bidi-font-size:
12.0pt;font-family:Arial;color:navy;mso-color-alt:windowtext'><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;mso-bidi-font-size:12.0pt;font-family:Arial;color:navy'>I always check
both batteries before and after each flight that way the is less chance of a
surprise.<span style="mso-spacerun:
yes"> </span></span></font><font
size=2 color=navy face=Arial><span style='font-size:10.0pt;mso-bidi-font-size:
12.0pt;font-family:Arial;color:navy;mso-color-alt:windowtext'><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;mso-bidi-font-size:12.0pt;font-family:Arial;color:navy'> </span></font><font
size=2 color=navy face=Arial><span style='font-size:10.0pt;mso-bidi-font-size:
12.0pt;font-family:Arial;color:navy;mso-color-alt:windowtext'><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;mso-bidi-font-size:12.0pt;font-family:Arial;color:navy'>This is not any
better than other proposed systems, just what I have used for some time.<span
style="mso-spacerun: yes"> </span></span></font><font size=2 color=navy
face=Arial><span style='font-size:10.0pt;mso-bidi-font-size:12.0pt;font-family:
Arial;color:navy;mso-color-alt:windowtext'><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;mso-bidi-font-size:12.0pt;font-family:Arial;color:navy'> </span></font><font
size=2 color=navy face=Arial><span style='font-size:10.0pt;mso-bidi-font-size:
12.0pt;font-family:Arial;color:navy;mso-color-alt:windowtext'><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;mso-bidi-font-size:12.0pt;font-family:Arial;color:navy'>Good luck</span></font><font
size=2 color=navy face=Arial><span style='font-size:10.0pt;mso-bidi-font-size:
12.0pt;font-family:Arial;color:navy;mso-color-alt:windowtext'><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;mso-bidi-font-size:12.0pt;font-family:Arial;color:navy'>Wojtek</span></font><font
color=navy><span style='color:navy;mso-color-alt:windowtext'><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=black face="Times New Roman"><span
style='font-size:10.0pt;color:black'><![if !supportEmptyParas]> <![endif]></span></font><font
size=2 color=black><span style='font-size:10.0pt;color:black;mso-color-alt:
windowtext'><o:p></o:p></span></font></p>
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