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From: "Rob Butts (r DOT butts DOT geda AT gmail DOT com) [via geda-user AT delorie DOT com]" <geda-user AT delorie DOT com>
Date: Wed, 25 Mar 2020 13:09:18 -0400
Message-ID: <CAM7eQ1n73zpqxa748--kyNT7pQiydAAwDur27QSVHWjvQByP=w@mail.gmail.com>
Subject: Re: [geda-user] Tenergy TB6B LiPo Charger
To: geda-user AT delorie DOT com
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Reply-To: geda-user AT delorie DOT com

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Assuming they used a nominal 3.7V cell voltage, that would be five.

I don't see where I said five but yes, it is clear there are three.  Every
time I've charged them it has been on a balanced charger.

I asked the ebay seller regarding these 11.1V batteries and why they fail
low voltage fault on the balanced charger when they show a 7.4V charge and
how do I fix it.  Here is their response:

Normal cell voltage is between 3.7v~4.2v. Never over-discharge or
> over-charge. The voltage of each cell can't be lower than 3.7V and can't
> exceed 4.2V(except HV battery), otherwise the battery will be damaged
> (swell or dead).


I believe they do not have the technical knowledge of how to charge their
11.1V batteries.  Clearly I need a power supply cutoff circuit when the
battery voltage drops to a specific voltage.  Here is my reply to them
which I have yet to hear back.

I need clarification as to what voltage to cut power to my circuit board.
> It is an 11.1V battery. Should I cut the power off when the battery gets to
> 3.7V? Keep in mind I can only see the voltage at the deans connector which
> measures 11.1V with full charge.


So my question here is:  To protect these LiPo batteries from over
discharging what should I set as a cutoff voltage to?  If they don't want
each cell droping below 3.7V that would mean I cut them off below the
11.1V.  Has anyone used LiPo batteries in a high current application (up to
15 amps but not continuous)?

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<div dir=3D"ltr">Assuming they used a nominal 3.7V cell voltage, that would=
 be five.=C2=A0<div><br></div><div>I don&#39;t see where I said five but ye=
s, it is clear there are three.=C2=A0 Every time I&#39;ve charged them it h=
as been on a balanced charger.</div><div><br></div><div>I asked the ebay se=
ller regarding these 11.1V batteries and why they fail low voltage fault on=
 the balanced charger when they show a 7.4V charge and how do I fix it.=C2=
=A0 Here is their response:<br></div><div><span style=3D"color:rgb(35,31,32=
);font-family:Helvetica,Arial,sans-serif;font-size:14px;background-color:rg=
b(249,249,249)"><br></span></div><blockquote style=3D"margin:0 0 0 40px;bor=
der:none;padding:0px"><blockquote class=3D"gmail_quote" style=3D"margin:0px=
 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><sp=
an style=3D"color:rgb(35,31,32);font-family:Helvetica,Arial,sans-serif;font=
-size:14px;background-color:rgb(249,249,249)">Normal cell voltage is betwee=
n 3.7v~4.2v. Never over-discharge or over-charge. The voltage of each cell =
can&#39;t be lower than 3.7V and can&#39;t exceed 4.2V(except HV battery), =
otherwise the battery will be damaged (swell or dead).</span>=C2=A0</blockq=
uote></blockquote><div><br></div><div>I believe they do not have the techni=
cal knowledge of how to charge their 11.1V batteries.=C2=A0 Clearly I need =
a power supply cutoff circuit when the battery voltage drops to a specific =
voltage.=C2=A0 Here is my reply to them which I have yet to hear back.<br><=
/div><div><br></div><blockquote style=3D"margin:0 0 0 40px;border:none;padd=
ing:0px"><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8e=
x;border-left:1px solid rgb(204,204,204);padding-left:1ex"><span style=3D"c=
olor:rgb(35,31,32);font-family:Helvetica,Arial,sans-serif;font-size:14px;ba=
ckground-color:rgb(249,249,249)">I need clarification as to what voltage to=
 cut power to my circuit board. It is an 11.1V battery. Should I cut the po=
wer off when the battery gets to 3.7V? Keep in mind I can only see the volt=
age at the deans connector which measures 11.1V with full charge.</span>=C2=
=A0</blockquote></blockquote><div><br></div><div>So my question here is:=C2=
=A0 To protect these LiPo batteries from over discharging what should I set=
 as a cutoff voltage to?=C2=A0 If they don&#39;t want each cell droping=C2=
=A0below 3.7V that would mean I cut them off below the 11.1V.=C2=A0 Has any=
one used LiPo batteries in a high current application (up to 15 amps but no=
t continuous)?<br></div><div><br></div><div><br></div></div>

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