<html>
<head>
<meta content="text/html; charset=UTF-8" http-equiv="Content-Type">
</head>
<body text="#000000" bgcolor="#FFFFFF">
Same here!<br>
<br>
I'm just concerned some Li-ion/Li-po batteries do not have an
over-discharge protection and this could be an issue if you try to
recharge a Li* battery that's been drained beyond its inversion
voltage. Ask Boeing about this... ;)<br>
I doubt this has been included in the RME sound cards since they are
built to take almost any kind of low voltage power (AC and DC).<br>
<br>
<a class="moz-txt-link-freetext" href="http://batteryuniversity.com/learn/article/charging_lithium_ion_batteries">http://batteryuniversity.com/learn/article/charging_lithium_ion_batteries</a><br>
<blockquote type="cite">
<h2> Over-discharging Lithium-ion</h2>
<p> Li-ion should never be discharged too low, and there are
several safeguards to prevent this from happening. The equipment
cuts off when the battery discharges to about 3.0V/cell,
stopping the current flow. If the discharge continues to about
2.70V/cell or lower, the battery’s protection circuit puts the
battery into a sleep mode. This renders the pack unserviceable
and a recharge with most chargers is not possible. To prevent a
battery from falling asleep, apply a partial charge before a
long storage period.</p>
<p> Battery manufacturers ship batteries with a 40 percent charge.
The low charge state reduces aging-related stress while allowing
some self-discharge during storage. To minimize the current flow
for the protection circuit before the battery is sold, advanced
Li-ion packs feature a sleep mode that disables the protection
circuit until activated by a brief charge or discharge. Once
engaged, the battery remains operational and the on state can no
longer be switched back to the standby mode.</p>
<p> Do not recharge lithium-ion if a cell has stayed at or below
1.5V for more than a week. Copper shunts may have formed inside
the cells that can lead to a partial or total electrical short.
If recharged, the cells might become unstable, causing excessive
heat or showing other anomalies. Li-ion packs that have been
under stress are more sensitive to mechanical abuse, such as
vibration, dropping and exposure to heat.</p>
</blockquote>
<br>
You need to make sure you have an over-discharge protection that
cuts off the power when reaching about 3.2V per cell (3 cell would
be between 9.0V and 9.6V). I'm not sure I have this in the pack I
use... :/<br>
<br>
Some more detail to read when you've set your bedroom on fire ;)<br>
<a class="moz-txt-link-freetext" href="http://www.nfpa.org/assets/files/pdf/research/rflithiumionbatterieshazard.pdf">http://www.nfpa.org/assets/files/pdf/research/rflithiumionbatterieshazard.pdf</a><br>
<br>
<br>
Lead batteries don't like being over-drained either. It's just not
as dangerous to recharge a Pb that's been drained too much.<br>
<br>
Hope this helps.<br>
Cheers<br>
Pierre-Olivier<br>
<br>
<br>
<br>
<div class="moz-cite-prefix">On 26/04/2013 18:03, Antoine Villeret
wrote:<br>
</div>
<blockquote
cite="mid:CAGn5wNeLR_BohiaiMa4zdp6gdxMAUr9sbzYey4BXTkMjBvAhbA@mail.gmail.com"
type="cite">
<div dir="ltr">hey,
<div><br>
</div>
<div style="">i got a car cigarette lighter plug adaptor with my
RME fireface, </div>
<div style="">so just take a 12V Pb battery from a teenager
motorcycle and go !</div>
<div style=""><br>
</div>
<div style="">
if you need a lighter solution, look at LiPo battery from R/C
model </div>
<div style=""><br>
</div>
<div style="">cheers</div>
<div style=""><br>
</div>
<div style="">a</div>
</div>
<div class="gmail_extra"><br clear="all">
<div>--<br>
do it yourself <br>
<a moz-do-not-send="true"
href="http://antoine.villeret.free.fr" target="_blank">http://antoine.villeret.free.fr</a><br>
</div>
<br>
<br>
<div class="gmail_quote">2013/4/26 Alexandre Torres Porres <span
dir="ltr"><<a moz-do-not-send="true"
href="mailto:porres@gmail.com" target="_blank">porres@gmail.com</a>></span><br>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">
hey folks, anyone have recomendations for battery packs for
audio cards?
<div><br>
</div>
<div>wanna try some stuff going mobile, anybody doing that?
Looking for some high capacity for my multiface/RME (takes
<span
style="color:rgb(34,34,34);font-size:12.727272033691406px;font-family:arial,sans-serif">9-.12V,
2A)</span></div>
<div><span
style="color:rgb(34,34,34);font-size:12.727272033691406px;font-family:arial,sans-serif"><br>
</span></div>
<div><span
style="color:rgb(34,34,34);font-size:12.727272033691406px;font-family:arial,sans-serif">thanks</span></div>
<br>
_______________________________________________<br>
<a moz-do-not-send="true" href="mailto:Pd-list@iem.at">Pd-list@iem.at</a>
mailing list<br>
UNSUBSCRIBE and account-management -> <a
moz-do-not-send="true"
href="http://lists.puredata.info/listinfo/pd-list"
target="_blank">http://lists.puredata.info/listinfo/pd-list</a><br>
<br>
</blockquote>
</div>
<br>
</div>
<br>
<fieldset class="mimeAttachmentHeader"></fieldset>
<br>
<pre wrap="">_______________________________________________
<a class="moz-txt-link-abbreviated" href="mailto:Pd-list@iem.at">Pd-list@iem.at</a> mailing list
UNSUBSCRIBE and account-management -> <a class="moz-txt-link-freetext" href="http://lists.puredata.info/listinfo/pd-list">http://lists.puredata.info/listinfo/pd-list</a>
</pre>
</blockquote>
<br>
<pre class="moz-signature" cols="72">--
~ Pierre-Olivier Boulant ~
-o- <a class="moz-txt-link-abbreviated" href="http://www.puffskydd.net">www.puffskydd.net</a> -o-
~ <a class="moz-txt-link-abbreviated" href="http://www.flickr.com/pob31/sets">www.flickr.com/pob31/sets</a> ~
-o- <a class="moz-txt-link-abbreviated" href="http://www.lepixophone.net">www.lepixophone.net</a> -o-
</pre>
</body>
</html>