X-Authentication-Warning:	delorie.com: mail set sender to geda-user-bounces using -f
X-Recipient:	geda-user AT delorie DOT com
X-Original-DKIM-Signature:	v=1; a=rsa-sha256; c=relaxed/relaxed;
	d=gmail.com; s=20161025;
	h=mime-version:references:in-reply-to:from:date:message-id:subject:to;
	bh=c4TWXRKdk9bIS+m3F5dfm0vUi0wFq2v+rF7jJLI9PAs=;
	b=QXWc1+ZfPPKPCUWYhJKkjsmi9iZQ6t0UAZFPd9lQLPgDuX82+60m1U+JKn8AdbPpE5
	JAIlFgg0ghJ5GgiEgcJkFQX+0sqox86iZ3Ib/VsGUFhH9kG15rGcOShykRWdd46gye8V
	+zuvK20pbBwXxfr5dATIuJgbUIh7bWgUIPkdxS5W3Nf3towpZCIW7rO6rf8JcQo6Lm7u
	Kb3boQJkKalIdIVUyM/opYuh9LeGjcfpGL5bLQ5CTa1AUKa0AuorXfxpV7DWo+D4i0bu
	kmIXwXsKKlINjntVAczz959tLn5ZJcYd2HpszVaqD1AduTzOGwcv3N4UJo4IHXsu1u2c
	sFYQ==
X-Google-DKIM-Signature:	v=1; a=rsa-sha256; c=relaxed/relaxed;
	d=1e100.net; s=20161025;
	h=x-gm-message-state:mime-version:references:in-reply-to:from:date
	:message-id:subject:to;
	bh=c4TWXRKdk9bIS+m3F5dfm0vUi0wFq2v+rF7jJLI9PAs=;
	b=kOQFCePF9uzLFjkSRjj0kLebuiceOY7Baqa6ONj0dlBxHwPqSrgVEyLt0P4SFdCErM
	tukJ0zXrHamOsUBrCgyokLVlvNp6ScZpwTZCxhRy257iSkNfptS4Lh4FUzf4w/cJOR9+
	d19bMfLbKFzOuJ0z/iEDjCjKdqFfozSisrZYabRN/fPa2FEpTxGcwFDf+F1NVUiQWUR8
	GUcZT88pTgjXAZfW8dMBvGGujXUqnDhb13C9h55RaGvpw4HIICtGphktG341BCOXN+P6
	GPbiTp6aOrc3cc8WpR2O7X6yblXkByNKi9JUJg53wWOGpWC4/nOoTH64BH+s/ME2Lbxu
	WKrA==
X-Gm-Message-State:	ANhLgQ2vFD5/Fhu3p50ePiEBBCZ/PqkSUChz5/cYWbOZKGF4QW4SPcEY
	kIv1VzAzCLj9oYNp/07tz94Qi8jNAtDtbr9OEqjvWcmh
X-Google-Smtp-Source:	ADFU+vsnSScAn0WSlKqJiRhljcn0LbWDbNCipzFxeG8MJzKqa45hW/8iSu3qLDpt2UVgzrs9iTamc5etTUPEL7WX5/0=
X-Received:	by 2002:a05:6e02:d0a:: with SMTP id g10mr4713351ilj.228.1585156170094;
	Wed, 25 Mar 2020 10:09:30 -0700 (PDT)
MIME-Version:	1.0
References:	<CAM7eQ1=e5rn+Mo1qDeo5hWDr9qjYnoy3=2XzuOjpEk+DoPCS7A AT mail DOT gmail DOT com>
	<20200323190245 DOT fdaebdc11b52d1f734d79d2f AT gmail DOT com> <CAM7eQ1k4+tq=BMrEpYS--EF587q6ASfZjRbybfbOzgaowSBcfA AT mail DOT gmail DOT com>
	<20200323205229 DOT d73d6db596a9cbf031cdd1e2 AT gmail DOT com> <CAM7eQ1=FWcNtkPP36Qy9_mPViH+UKr06kf-oyYDucaqV2Smh7A AT mail DOT gmail DOT com>
	<20200324174534 DOT 6a551748adbf9c9fdd4242d3 AT gmail DOT com> <9a9c3a42-8702-fb4e-62f0-a9316c75cdaf AT earthlink DOT net>
In-Reply-To:	<9a9c3a42-8702-fb4e-62f0-a9316c75cdaf@earthlink.net>
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
Reply-To:	geda-user AT delorie DOT com

--0000000000006e9f7605a1b0ee33
Content-Type: text/plain; charset="UTF-8"

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)?

--0000000000006e9f7605a1b0ee33
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<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>

--0000000000006e9f7605a1b0ee33--

- Raw text -