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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 |
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't see where I said five but ye= s, it is clear there are three.=C2=A0 Every time I'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't be lower than 3.7V and can'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'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--
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